Patents Act 1970: Complete Legal Guide for India
Complete guide to the Patents Act 1970 — patentability, Section 3(d), compulsory licensing, Bolar exception, opposition, revocation, PCT and key timelines explained.
SERVICESIPR
Laxita Chandolia
7/27/202630 min read
INTRODUCTION
Innovation is the engine of economic progress. But innovation requires investment — in research, in development, in the years of effort that separate an idea from a working invention. Without a legal framework that protects inventors from free-riders who would simply copy their work without contributing to the cost of creating it, the incentive to innovate would be severely diminished.
The Patents Act, 1970 is India's foundational legislation governing the grant, protection, and enforcement of patent rights. It establishes the legal contract between inventors and the state — offering inventors a time-limited monopoly over their inventions in exchange for full public disclosure of how those inventions work. It balances the private interests of inventors with the public interest in access to technology, particularly in sectors like pharmaceuticals, food, and agriculture — where the consequences of monopoly pricing can be matters of life and death. This complete guide covers every major provision of the Patents Act, 1970 — from the definition of a patentable invention and the conditions for patentability, through the application and examination process, opposition proceedings, grant and rights, compulsory licensing, government use, infringement remedies, and India's international patent obligations.
What Is the Patents Act, 1970?
The Patents Act, 1970 is the primary Indian legislation governing the grant and regulation of patents for inventions. It came into force on 20 April 1972, replacing the colonial-era Indian Patents and Designs Act, 1911. The architecture of the original Act was heavily influenced by the recommendations of the Justice N. Rajagopala Ayyangar Committee, whose landmark 1959 report recommended that in areas like drugs, medicines, and food, process patents rather than product patents should be the norm. This approach allowed Indian industry to produce essential medicines through alternative manufacturing processes at affordable prices, without being blocked by product patents held by multinational pharmaceutical companies.
The Core Patent Bargain
At its heart, a patent represents a legal contract between the inventor and the State:
The inventor discloses the complete specification of their invention — making the technical knowledge available to the public.
The State grants the inventor an exclusive right to prevent others from making, using, selling, offering for sale, or importing the invention in India for a defined period.
This exclusive right is not perpetual — it is bounded by the statutory term, compliance with patentability requirements, and a range of public-interest conditions including compulsory licensing and government use.
The TRIPS Amendment — 2005
The most significant reform of the Patents Act came through the Patents (Amendment) Act, 2005, enacted in compliance with India's obligations under the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) as a member of the World Trade OrganisationOf.
The 2005 amendment introduced product patents in all fields of technology — including pharmaceuticals, agrochemicals, and food products — ending the process-patent-only regime that had existed since the 1960s. However, the amendment also introduced crucial safeguards — most notably Section 3(d) — designed to prevent evergreening of pharmaceutical patents and preserve access to affordable medicines.
Earlier amendments in 1999 and 2002 had introduced mailbox provisions and exclusive marketing rights for pharmaceutical and agrochemical product patents pending the 2005 amendment, and had aligned Indian law with the Patent Cooperation Treaty (PCT).
Definition: The Patents Act, 1970 is India's primary legislation governing the grant, protection, enforcement, and administration of patents for inventions — balancing the exclusive rights of inventors with the public interest in access to technology and affordable products.
Structure of the Patents Act, 1970
The Act is organised into 23 Chapters covering every aspect of the patent system:
Chapter I – Preliminary
Contains the preliminary provisions, including definitions of important terms used throughout the Patents Act, 1970.Chapter II – Inventions Not Patentable
Defines the scope of patentable subject matter and specifies inventions that are excluded from patent protection under Indian law.Chapter III – Applications for Patents
Governs the filing of patent applications, the persons entitled to apply, priority claims, and procedural requirements for submitting applications.Chapter IV – Provisions Relating to Specifications
Deals with provisional and complete specifications, disclosure requirements, claims, and the contents of patent specifications.Chapter V – Examination of Applications
Regulates the examination process, including requests for examination, examination reports, and compliance with objections raised by the Patent Office.Chapter VA – Opposition Proceedings to Grant of Patents
Provides for both pre-grant opposition and post-grant opposition, allowing eligible persons to challenge the grant of a patent on specified statutory grounds.Chapter VI – Anticipation
Deals with circumstances in which an invention is considered anticipated and explains exceptions that preserve novelty.Chapter VII – Anticipation by Previous Publication
Covers anticipation through prior publication and provides various grace period protections and statutory exceptions.Chapter VII-A – Provisions Relating to Inventors Employed in Defence Services
Contains special provisions governing inventions made by persons employed in defence services or related government establishments.Chapter VIII – Grant of Patents and Rights Conferred Thereby
Governs the grant of patents, publication of grant, the rights of patentees, secrecy directions for defence-related inventions, and the legal consequences of patent grant.Chapter IX – Patents of Addition
Provides for patents of addition in respect of improvements or modifications of an existing patented invention without requiring a separate renewal fee.Chapter X – Amendment of Applications and Specifications
Regulates amendments to patent applications, complete specifications, and related documents during prosecution or after grant.Chapter XI – Restoration of Lapsed Patents
Prescribes the procedure for restoring patents that have ceased to have effect due to non-payment of renewal fees.Chapter XII – Surrender and Revocation of Patents
Deals with voluntary surrender of patents and statutory grounds for revocation by the High Court or other competent authority.Chapter XIII – Register of Patents and Patent Office Records
Provides for the maintenance of the Register of Patents, correction of entries, inspection of records, and evidentiary value of the register.Chapter XIV – Patent Agents
Regulates the qualifications, registration, rights, duties, and disciplinary control of patent agents.Chapter XV – Suits Concerning Infringement of Patents
Governs infringement actions, available remedies, and judicial proceedings relating to patent infringement, which are now primarily heard by the High Courts following the abolition of the Intellectual Property Appellate Board (IPAB) in 2021.Chapter XVI – Working of Patents, Compulsory Licences and Revocation
Contains provisions relating to the commercial working of patents in India, compulsory licences, revocation for non-working, and related public interest safeguards.Chapter XVII – Use of Inventions for Government Purposes and Acquisition by the Central Government
Authorises government use of patented inventions and provides for acquisition of inventions by the Central Government under specified circumstances.Chapter XVIII – Appeals and Other Proceedings
Contains procedural provisions relating to legal proceedings connected with patents, with appellate jurisdiction now substantially vested in the High Courts after the abolition of the IPAB.Chapter XIX – Appeals to the High Court
Provides for appeals to the High Court against specified decisions and orders made under the Act.Chapter XX – Penalties
Prescribes offences, penalties, and punishments for contraventions of the provisions of the Patents Act.Chapter XXI – Patent Office
Deals with the establishment, administration, powers, and functions of the Patent Office and its officers.Chapter XXII – International Arrangements
Implements India's obligations under international treaties, including the Paris Convention and the Patent Cooperation Treaty (PCT), and governs international patent applications.Chapter XXIII – Miscellaneous
Contains miscellaneous provisions, including procedural matters, rule-making powers, and Section 140, which restricts anti-competitive conditions in patent licence agreements.
Definitions and Patentability Requirements (Section 2)
Section 2 of the Act provides the foundational definitions that establish the scope of patentability. The most important is the definition of "invention" — which the Act defines as any new and useful art, process, machine, manufacture or composition of matter, or any new and useful improvement thereof, involving an inventive step and capable of industrial application.
Three conditions must be individually satisfied for an invention to qualify for patent protection:
1. Novelty
The invention must not have been made available to the public — anywhere in the world — before the priority date of the patent application. Disclosure through prior use, description in printed publications, or any other means of public disclosure constitutes prior art that can destroy novelty. Novelty is assessed against the global state of knowledge — not merely what was known in India.
2. Inventive Step
Section 2(1)(ja) defines inventive step as a feature of an invention that involves a technical advance as compared to existing knowledge, or has economic significance, or both — and which makes the invention not obvious to a person skilled in the art.
The inventive step requirement prevents the patent system from being used to monopolise trivial improvements or combinations that would be obvious to any competent technician working in the relevant field. A patent that claims only what a skilled person would have done anyway provides no real incentive for innovation.
3. Industrial Applicability
The invention must be capable of being made or used in some kind of industry. Pure theories, abstract concepts, and mathematical methods — however intellectually impressive — cannot be patented because they lack industrial applicability.
Other Key Definitions
"Patentee" — the person currently registered as the grantee or proprietor of the patent
"Person interested" — defined broadly to include any person engaged in or promoting research in the field related to the patented invention, allowing a wide range of parties to file opposition and revocation actions
"Complete specification" — the full technical document describing the invention and defining the claims
"Convention application" — an application claiming priority from an earlier filing in a Paris Convention country
What Cannot Be Patented — Section 3
Section 3 sets out an exhaustive list of subject matter that is excluded from patentability — regardless of whether the excluded subject matter satisfies the novelty, inventive step, and industrial applicability requirements. These exclusions reflect policy judgements about what should not be monopolised through the patent system.
The major categories of non-patentable subject matter under Section 3 include:
Frivolous or contrary to natural laws: Inventions that are frivolous or obviously contrary to well-established principles of natural science — such as perpetual motion machines — cannot be patented.
Contrary to public order or morality: Inventions whose primary or intended use would be contrary to public order or morality, or seriously prejudicial to human, animal, or plant life or health, or to the environment, are excluded.
Mere discovery: The mere discovery of a scientific principle, formulation of an abstract theory, or discovery of any living thing or non-living substance existing in nature is not patentable. Discovery is distinguished from invention — a patent requires human ingenuity in creating something new, not merely finding what already exists.
New forms of known substances — the critical Section 3(d): This provision has been particularly significant in the pharmaceutical sector. Section 3(d) provides that the mere discovery of a new form of a known substance — including a new salt, ester, polymorph, isomer, metabolite, or other derivative — is not patentable unless the applicant can demonstrate that the new form has significantly different properties from the known substance with regard to efficacy.
Section 3(d) was specifically designed to prevent evergreening — the practice of pharmaceutical companies extending their patent monopolies by making minor modifications to existing drugs (changing the salt form, the dosage form, or the delivery mechanism) and obtaining fresh 20-year patents on these modified forms without delivering genuine therapeutic benefit. The Supreme Court's landmark judgment in Novartis AG v. Union of India (2013) upheld the constitutional validity of Section 3(d) and confirmed that it sets a high threshold for patentability of pharmaceutical modifications.
Mere combinations: A combination of known elements that does no more than produce a result by bringing together the known properties of the components — without any synergistic or unexpected effect — is not patentable.
Methods of agriculture and horticulture: Methods of cultivating crops, treating soil, or propagating plants through agricultural or horticultural techniques are excluded.
Methods of treatment: Processes for treating human or animal bodies to remove disease or dysfunction — including surgical, therapeutic, and diagnostic methods — are not patentable in India.
Plants, animals, and biological processes: Plants and animals other than micro-organisms, and essentially biological processes for the production or propagation of plants or animals, are excluded.
Computer programmes and mathematical methods: Computer programmes, algorithms, and mathematical methods "as such" are not patentable. However, where a computer programme produces a technical effect beyond the normal physical interactions between a programme and the computer on which it runs, the invention may potentially be patentable as a whole.
Business methods and mental acts: Methods of doing business, schemes for performing mental acts, and rules for playing games are excluded.
Traditional knowledge: Inventions that are essentially aggregations or duplications of the properties of traditionally known components — including traditional medicinal knowledge — are not patentable.
Atomic Energy Exclusion (Section 4)
Section 4 provides an absolute exclusion from patentability for any invention relating to atomic energy falling within the scope of Section 20(1) of the Atomic Energy Act, 1962. This exclusion is unconditional — it applies regardless of whether the invention satisfies the novelty, inventive step, and industrial applicability requirements. It reflects the strategic sensitivity of nuclear technology and the government's policy of retaining exclusive control over developments in this field.
Who Can Apply for a Patent (Sections 6 to 9)
Section 6 specifies who is eligible to file a patent application in India:
The true and first inventor of the invention
A person who is the assignee of the true and first inventor — such as an employer to whom the inventor's IP rights have been assigned, or a company that has acquired the invention
A legal representative of a deceased person who was entitled immediately before their death to apply for the patent
Applications may be filed singly or jointly by two or more eligible persons.
Provisional and Complete Specifications (Section 9)
Section 9 governs the important relationship between provisional and complete specifications:
Provisional specification: An applicant who is still developing their invention can file a provisional specification to secure a priority date — locking in the date against which novelty will be assessed — without needing to have finalised all the details of the invention. The provisional specification provides a description of the invention but does not include final claims.
Complete specification: The complete specification — including the final, defined claims — must be filed within 12 months of the filing of the provisional specification. Failure to file the complete specification within this period results in the application being deemed abandoned.
Where an applicant files two or more provisional specifications relating to connected inventions, the Controller may — in appropriate circumstances — allow a single complete specification to be filed covering all the related provisional specifications.
Foreign Filing Obligations (Section 8)
Section 8 imposes an important obligation on applicants who are simultaneously pursuing corresponding patent applications in foreign countries. Such applicants must keep the Controller informed of the status of those foreign applications — including details of any prior art cited against them, any amendments made, and the outcome of examination. Failure to comply with this disclosure obligation — or providing false information — is a ground for revocation of the patent under Section 64.
Sufficiency of Disclosure (Section 10)
Section 10 is foundational to the patent bargain. The complete specification must:
Fully describe the invention and the manner in which it is to be performed
Disclose the best method of performing the invention known to the applicant at the time of filing
Conclude with one or more claims that clearly define the scope of the invention for which protection is claimed
Ensure that the claims are supported by and consistent with the description in the specification
The sufficiency requirement — that the description must be adequate to enable a person skilled in the art to perform the invention without undue experimentation — is fundamental. An inventor who receives a patent monopoly in exchange for inadequate disclosure has not fulfilled their side of the patent bargain. Insufficient disclosure is a ground for revocation under Section 64.
Biological Material Deposits
Where an invention involves biological material that cannot be adequately described in writing — such as a novel microorganism — the inventor must deposit the biological material with an internationally recognised depository authority (IDA) under the Budapest Treaty. The details of the deposit must be included in the specification.
Example: An inventor develops a method for cultivating a microorganism that produces a commercially valuable enzyme. If the specification fails to describe the growth conditions — medium composition, temperature, pH, and other parameters — with sufficient detail for a skilled microbiologist to reproduce the method, the specification is insufficient and the patent may be revoked. If the microorganism is novel and cannot be fully described in writing, the inventor must deposit a viable strain with a Budapest Treaty depository and reference it in the specification.
Publication, Examination, and Search (Sections 11A to 14)
Publication (Section 11A)
Patent applications are automatically published in the official journal 18 months from the date of filing or the priority date — whichever is earlier. Applicants who wish to publish earlier — for example, to establish prior art against competitors or to signal to the market that a patent application is pending — can apply for early publication under Section 11A(2), which typically results in publication approximately one month after the application.
From the date of publication, the applicant acquires provisional rights — the ability to claim damages for infringement occurring between publication and grant, once the patent is ultimately granted.
Examination (Sections 11B and 14)
Examination is not automatic — the applicant (or any interested person) must file a Request for Examination within the period prescribed by the Patent Rules. If no request for examination is filed within this period, the application is deemed abandoned.
Once a request for examination is filed, the application is referred to an examiner who conducts a prior art search — examining both patent and non-patent literature — and issues a First Examination Report (FER) setting out any objections relating to:
Novelty — whether the invention is anticipated by prior art
Inventive step — whether the invention is obvious in light of the prior art
Industrial applicability
Sufficiency of disclosure
Unity of invention — whether the claims relate to a single inventive concept
Clarity of claims
Non-patentability under Sections 3 and 4
Under Section 14, where objections are raised, the Controller notifies the applicant and gives them an opportunity to respond — either by amending the claims and specification to overcome the objections, or by arguing against the objections. If the Controller remains unsatisfied after the applicant's response, the application may be rejected — subject to the applicant's right to a hearing and appeal.
Example: An applicant entering the Indian national phase through the PCT route applies for early publication to secure provisional protection ahead of the 18-month automatic publication date. When the examiner's search cites two prior art documents that anticipate certain claims, the applicant amends their claims to distinguish from the cited documents and argues that the remaining claims involve an inventive step. If the Controller is persuaded, the application proceeds to grant. If not, the applicant has the right to a hearing and ultimately to appeal to the High Court.
Opposition Proceedings (Section 25)
The Patents Act provides two stages at which a patent application or granted patent may be challenged:
Pre-Grant Opposition (Section 25(1))
Any person — with no need to establish a particular interest — may file a pre-grant opposition at any time after the publication of the application and before the grant of the patent. The grounds for pre-grant opposition include:
Wrongful acquisition — the invention was wrongfully obtained from the opponent
Prior publication — the invention was published before the application date
Prior claiming — the invention is already claimed in an earlier Indian application
Prior public knowledge or use in India
Obviousness — the invention lacks an inventive step
Non-patentability under the Act (Sections 3 and 4)
Insufficient description of the invention
Failure to disclose or false disclosure of foreign application information under Section 8
Traditional knowledge — the invention is based on traditional knowledge
Post-Grant Opposition (Section 25(2))
A post-grant opposition may be filed by a "person interested" only — within one year of the date of publication of the grant. The grounds are broadly similar to pre-grant opposition grounds. A successful post-grant opposition results in revocation of the patent.
Example: A company is granted a patent for a device. Within the one-year opposition window, a competitor files a post-grant opposition alleging wrongful appropriation of the invention in breach of a confidentiality agreement. If the Controller finds the claim substantiated, the patent is revoked and may be granted instead to the true inventor or the party from whom the invention was misappropriated.
Anticipation and Grace Period Protections (Sections 29 to 34)
Sections 29 to 34 define what constitutes anticipation — prior disclosure that destroys the novelty of a later patent application — and provide limited exceptions where certain prior disclosures will not count as anticipation, provided the patent application is filed within the specified grace period.
The main grace period protections include:
Exhibition disclosure — disclosure at a notified international exhibition
Learned society disclosure — disclosure in a paper presented before a learned society or published in its proceedings
Government disclosure — disclosure to the government or a person authorised by the government to investigate the invention
In all these cases, the patent application must be filed within 12 months of the disclosure. If the application is filed after 12 months, the prior disclosure will count as anticipating prior art.
Example: An inventor demonstrates a working prototype at an international trade exhibition. Provided the patent application is filed within 12 months of the exhibition opening, the demonstration will not count as anticipating prior art. If the application is filed more than 12 months later, the inventor's own public demonstration will have destroyed the novelty of their application.
Secrecy Directions and Foreign Filing Controls (Sections 35 to 39)
Secrecy Directions (Sections 35 to 38)
The Controller, acting on recommendations from the Central Government, may issue secrecy directions in respect of any application relating to an invention that appears to have defence implications. While a secrecy direction is in force:
The application is not published and no patent is granted
The applicant cannot disclose any information about the invention
The applicant normally cannot file corresponding applications overseas
The government may pay compensation for losses suffered by the applicant as a result of the secrecy direction
Secrecy directions are regularly reviewed and are withdrawn when the invention is no longer considered defence-sensitive.
Foreign Filing Prohibition (Section 39)
Section 39 imposes a general prohibition on residents of India from filing patent applications abroad before filing in India — or within six weeks of filing in India — without first obtaining the written permission of the Controller. This applies to all inventions, not only defence-related ones.
Violation of Section 39 has serious consequences: the corresponding Indian application may be deemed abandoned, and the act of filing abroad without permission constitutes a criminal offence under Section 118.
Example: An inventor files a patent application for radar technology. The Controller issues a secrecy direction on the recommendation of the Central Government. The inventor cannot file abroad or publicly disclose the invention until the secrecy direction is lifted. If they file abroad in breach of the direction, the Indian application can be deemed abandoned and any patent granted may subsequently be revoked.
Grant, Rights, and Exceptions (Chapter VIII)
Rights on Grant (Section 48)
Upon successful examination and the passing of any opposition proceedings, the patent is granted — and with grant, the patentee obtains under Section 48 the exclusive right to prevent third parties from:
Making, using, offering for sale, selling, or importing the patented product in India (for product patents)
Using the patented process and using, offering for sale, selling, or importing the product directly obtained by that process (for process patents)
These rights are the core of the patent monopoly — they give the patentee the ability to exclude all others from commercially exploiting the invention in India without authorisation.
Statutory Exceptions to Patent Rights (Section 47)
The exclusive rights under Section 48 are expressly made subject to the conditions in Section 47, which provides for several statutory exceptions:
Government use — the government (or any person authorised by it) may use the patented invention for government purposes, subject to payment of compensation
Experimental and research use — use of the patented invention for experiments or research, including for imparting instructions to pupils, does not infringe the patent
Foreign vessels, aircraft, and vehicles — use of the patented invention on foreign-registered vessels, aircraft, or land vehicles that are temporarily or accidentally in India does not infringe
Government importation — the government may import patented medicines for its own use
The Bolar Exception (Section 107A)
Section 107A contains two important exemptions particularly relevant to the generic pharmaceutical industry:
The regulatory exception (Bolar exception): Any act of making, constructing, using, selling, or importing a patented invention solely for uses reasonably related to obtaining information required under any law for the regulation, manufacture, construction, use, or sale of any product is not infringement. This allows generic manufacturers to conduct the bioequivalence studies and clinical trials needed to obtain regulatory approval for their generic products — before the patent expires — so that they can enter the market immediately upon expiry. [Note: The scope and burden of proof for this exception was comprehensively analysed by the Madras High Court in Novartis AG v. Venkata Narayana Active Ingredients Pvt. Ltd. (2026), discussed elsewhere in our IPR coverage.]
Parallel importation: Importation of a patented product by any person from a person duly authorised by the patentee to sell or distribute the product does not constitute infringement.
Co-Ownership of Patents (Sections 50 and 51)
Where a patent is granted in the joint names of two or more persons, Section 50 provides that — unless there is a contrary agreement — the co-owners hold equal and undivided shares and each may individually manufacture, use, exercise, and sell the patented invention without accounting to the other co-owners. However, any licence or assignment of the patent requires the consent of all co-owners.
Where co-owners disagree on questions of licensing or amendment, Section 51 empowers the Controller to issue appropriate directions on the application of any co-owner.
Patents of Addition (Chapter IX, Sections 54 to 56)
A patent of addition is a specialised form of patent protection for improvements or modifications to an already-patented invention. It allows the applicant or patentee to obtain protection for incremental developments of the main invention without filing an entirely separate independent patent.
Key features of a patent of addition:
It does not need to possess an inventive step distinct from the main invention — it must only be novel
It has no independent term — it runs concurrently with the main patent and expires when the main patent expires
It may be converted into an independent patent under Section 55, after which it has its own independent term
Example: An inventor holds a patent for a core machine. They subsequently develop a module that significantly enhances the machine's performance. This improvement may be filed as a patent of addition — even if the improvement alone would not meet the threshold for an independent inventive step — and it will be protected for the remaining term of the main patent.
Amendment of Applications and Specifications (Chapter X, Sections 57 to 59)
Sections 57 to 59 regulate amendments to patent applications and specifications at any stage — before or after grant, during opposition or revocation proceedings, or otherwise. Amendments may be made before the Controller or before the High Court in the course of proceedings before it.
The fundamental rule governing all amendments is the prohibition on introduction of new matter: no amendment will be allowed that has the effect of introducing subject matter that was not disclosed in the specification as originally filed. Claims cannot be amended to cover matter that was not part of the original disclosure.
Example: A patentee seeks to add a claim covering a specific chemical compound that was never mentioned in the original specification. This amendment introduces new matter and will be rejected by the Controller. By contrast, narrowing a claim to exclude a species within the original claim's scope, or correcting a clerical error within the bounds of the original application, would be legitimate amendments.
Restoration, Surrender, and Revocation (Chapters XI and XII)
Restoration of Lapsed Patents (Sections 60 to 62)
A patent lapses if the annual renewal fee is not paid. However, the patent can be restored if the application for restoration is filed within the period prescribed by the Rules (currently 18 months from the date of lapsing) and the patentee can demonstrate that the failure to pay the renewal fee was unintentional and that there has been no undue delay in applying for restoration.
If restoration is granted, third parties who began exploiting the invention during the lapse period are protected through conditions imposed by the Controller.
Surrender (Section 63)
A patentee may offer to surrender their patent at any time by giving notice to the Controller. The offer is published, allowing interested persons to oppose, before the Controller accepts the surrender and revokes the patent.
Revocation (Section 64)
Section 64 is one of the most consequential provisions of the Act. It sets out the grounds on which a patent may be revoked — either on a petition by any person interested or the Central Government, or by way of a counter-claim in a suit for infringement before the High Court.
The extensive grounds for revocation include:
The invention was wrongfully obtained from the petitioner
The invention was already publicly known or used in India before the application date
The invention lacks novelty having regard to prior claims in earlier applications
The invention is obvious and does not involve an inventive step
The subject matter is not patentable under the Act
The specification does not sufficiently describe the invention or the method of performing it
The applicant failed to disclose required information about foreign applications under Section 8, or provided false information
The invention relates to atomic energy and is thus excluded under Section 4
Working of Patents and Compulsory Licensing (Chapter XVI)
Chapter XVI is the Act's most important public-interest safeguard — the mechanism through which the patent system ensures that monopoly rights serve the public good rather than being used purely as a barrier to access.
General Principles (Section 83)
Section 83 establishes the foundational philosophy of the working requirements: patents are granted not merely to give patentees the exclusive right to import the patented product, but to ensure that inventions are commercially worked in India in the most effective manner possible, without unnecessary delay. A patent that is used only to block Indian competition — without the patented product actually being made available in India — does not serve the public interest that justifies the monopoly.
Compulsory Licensing (Section 84)
At any time after three years from the date of grant of a patent, any interested person may apply to the Controller for a compulsory licence on any of three grounds:
The reasonable requirements of the public with respect to the patented invention have not been satisfied
The patented invention is not available to the public at a reasonably affordable price
The patented invention is not being worked in the territory of India
In considering whether to grant a compulsory licence, the Controller must consider multiple factors including the nature of the invention, the time elapsed since grant, the steps taken by the patentee to work the invention, the capacity of the applicant to work the invention to the public's benefit, and — critically — whether the applicant has made genuine efforts to obtain a voluntary licence from the patentee on reasonable terms, without success within a reasonable period (generally six months).
This last requirement — the prior attempt at a voluntary licence — may be waived in cases of national emergency, extreme urgency, or public non-commercial use, or where the patentee has been found to be engaged in anti-competitive practices.
A compulsory licence under Section 84 is:
Non-exclusive — the patent holder retains the right to license others
Non-assignable — the licensee cannot transfer the compulsory licence
Subject to royalty payments to the patentee, determined by the Controller to ensure reasonable remuneration
Revocation for Non-Working (Section 85)
Section 85 takes the working requirements a step further. After two years from the date of the first compulsory licence granted in relation to a particular patent, the Controller may revoke the patent entirely if:
The reasonable requirements of the public have still not been satisfied, or
The patented invention has still not been made available at a reasonable price
This provision — treating continued failure to work after compulsory licensing as a ground for total revocation — represents the Act's most severe response to patent abuse.
Emergency Compulsory Licensing (Section 92)
Section 92 empowers the Central Government to notify that compulsory licences will be available for a particular patent in cases of national emergency, extreme urgency, or public non-commercial use — bypassing the normal procedural requirements including the six-month negotiation period. This provision allows rapid government intervention in genuine public health emergencies.
Export Compulsory Licensing (Section 92A)
Section 92A allows a compulsory licence to be granted to enable the manufacture and export of pharmaceutical products to countries that lack the manufacturing capacity to produce those products themselves — implementing the Doha Declaration on TRIPS and Public Health and the subsequent Protocol amending the TRIPS Agreement.
Government Use and Acquisition of Inventions (Chapter XVII)
Government Use (Sections 99 to 101)
Sections 99 to 101 empower the Central Government — or any person authorised by it — to use a patented invention for government purposes (including defence) without the patentee's consent, subject to payment of compensation. The compensation is agreed with the patentee or, if agreement cannot be reached, determined by the High Court.
Any contractual provision purporting to restrict government use rights or requiring payment in excess of what the Act provides is void under Section 100(5).
Acquisition of Inventions (Section 102)
Section 102 empowers the Central Government to acquire an invention and its patent for a public purpose by notification in the official gazette. Upon such notification, the invention and patent vest absolutely in the Central Government, subject to payment of compensation.
Infringement, Defences, and Remedies (Chapter XVIII)
Jurisdiction
Following the Intellectual Property Tribunals Reforms Act, 2021 — which abolished the Intellectual Property Appellate Board (IPAB) — patent infringement actions are now heard by the relevant High Courts (in cases involving their original jurisdiction) or by the District Courts (based on the value of the suit).
Remedies for Infringement (Section 108)
The reliefs available in a patent infringement action include:
Injunction — restraining the infringer from continuing the infringing acts, either interim or permanent
Damages or account of profits at the plaintiff's option — the plaintiff elects between these two forms of monetary relief
Delivery up, forfeiture, or destruction of infringing goods
Appointment of a scientific adviser or assessor under Section 115 to assist the court in technical matters
Defences to Infringement
A defendant in a patent infringement action may raise:
The Section 47 exceptions — government use, experimental use, educational use
The Bolar exception under Section 107A
Parallel importation under Section 107A
Any ground for revocation under Section 64 as a defence — and the court may hear the revocation claim alongside the infringement action
Burden of Proof in Process Patent Cases (Section 104A)
Section 104A creates an important burden-shifting provision for process patent infringement. Where:
The subject matter of the patent is a process for obtaining a new product
The alleged infringer has produced a product identical to that new product
The patentee has been unable, despite reasonable efforts, to determine the process used
Then the burden of proof shifts to the defendant to demonstrate that their process is different from the patented process. The court must have regard to the defendant's legitimate interests in protecting their commercial secrets — ensuring that the burden-shifting provision is not used as a licence for unlimited disclosure of confidential manufacturing information.
Appeals and Penalties
Appeals (Section 117A)
Following the abolition of the IPAB, all appeals against Controller decisions — including refusals of applications, opposition proceedings, and compulsory licence decisions — now lie to the relevant High Court under Section 117A.
Criminal Offences and Penalties
The Act creates several criminal offences including:
Contravention of secrecy directions (Section 118) — filing abroad in breach of a secrecy direction or the Section 39 foreign filing prohibition
Unauthorised use of "Patent Office" designation (Section 119)
Falsification of entries in the patent register (Section 120)
False representation of an article as patented
Unauthorised practice as a patent agent
Patent Agents (Sections 125 to 132)
Only a registered patent agent — or the applicant themselves — can represent applicants and patentees in matters before the Controller. To be registered as a patent agent, a person must:
Possess a degree in science, engineering, or technology (or an equivalent qualification)
Satisfy residence and character requirements
Pass the Patent Agent Qualifying Examination conducted for this purpose
Registration as a patent agent is maintained on the register of patent agents, which is available for public inspection.
International Arrangements (Chapter XXII)
Paris Convention Priority (Section 135)
India is a signatory to the Paris Convention for the Protection of Industrial Property, and Section 135 gives effect to the Convention's priority provisions. An applicant who has filed a patent application in a Convention country can file a corresponding application in India within 12 months of the first filing date and claim the benefit of the earlier priority date for the purposes of assessing novelty and inventive step.
Patent Cooperation Treaty (PCT)
India is a member of the Patent Cooperation Treaty, which allows an inventor to file a single international application designating multiple member countries. An international PCT application designating India is treated as a national Indian application from the date of international filing, provided the applicant enters the Indian national phase within the prescribed period — ordinarily 31 months from the priority date.
Key Timelines Under the Patents Act, 1970
MilestoneTimelineProvisionProvisional to complete specification12 months from provisional filingSection 9Paris Convention priority period12 months from first filing in convention countrySection 135Exhibition/disclosure grace period12 months from qualifying disclosureSections 29–31Automatic publication of application18 months from filing or priority dateSection 11APCT national phase entry into India31 months from priority datePCT / RulesPost-grant oppositionWithin 1 year of publication of grantSection 25(2)Compulsory licence applicationAfter 3 years from date of grantSection 84Revocation after compulsory licenceAfter 2 years from first compulsory licenceSection 85Term of patent20 years from filing dateSection 53Restoration of lapsed patentWithin 18 months of date of cessationSections 60–62Foreign filing permissionFile in India or obtain permission before, or within 6 weeks of, filing abroadSection 39
Restrictive Conditions in Licences (Section 140)
Section 140 protects against the abuse of patent rights through anti-competitive conditions in licensing agreements. The following types of conditions in patent licences and sale agreements are void:
Requiring the licensee or purchaser to acquire goods other than the patented article from the patentee
Prohibiting the licensee or purchaser from using competing products from third parties
Requiring the licensee to grant back exclusive licences on improvements to the patented invention
Preventing or restricting the licensee from contesting the validity of the patent
These provisions reflect the Act's concern that patent monopolies should not be leveraged into broader anti-competitive control of markets beyond the scope of the patent itself.
Conclusion
The Patents Act, 1970 represents India's carefully calibrated approach to the fundamental tension at the heart of every patent system: rewarding genuine innovation with exclusive rights, while preventing those exclusive rights from becoming obstacles to public access to essential technologies.
Through its provisions on non-patentable subject matter — particularly the important Section 3(d) safeguard against pharmaceutical evergreening — compulsory licensing, government use, working requirements, and revocation for non-working, the Act has built robust public-interest safeguards into the very structure of the patent grant.
The landmark Patents (Amendment) Act, 2005, by extending product patent protection to all fields of technology in compliance with India's TRIPS obligations, fundamentally expanded the scope of patentability in India — while using the flexibilities permitted by TRIPS to protect public health and ensure access to affordable medicines.
The Patents Rules — last updated in 2024 — continue to evolve the procedural framework, expanding access to the patent system for startups, small entities, and educational institutions through reduced fees and expedited examination options.
As India's innovation ecosystem continues to grow — in pharmaceuticals, biotechnology, software, manufacturing, and clean technology — the Patents Act, 1970 remains the cornerstone of India's intellectual property framework: a living piece of legislation that continues to balance the incentive to innovate with the imperative of public access.
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KEY TAKEAWAYS
The Patents Act, 1970 is India's primary patent legislation — governing the grant, protection, enforcement, and administration of patents since its commencement on 20 April 1972.
A patent is a legal contract between the inventor and the state — the inventor discloses the invention fully in exchange for a time-limited exclusive monopoly.
Three conditions must be satisfied for patentability: novelty (not previously disclosed anywhere in the world), inventive step (not obvious to a person skilled in the art), and industrial applicability (capable of being made or used in industry).
Section 3 excludes a wide range of subject matter from patentability, including mere discoveries, methods of treatment, essentially biological processes, computer programmes as such, and — critically through Section 3(d) — new forms of known pharmaceutical substances unless they demonstrate significantly enhanced efficacy.
The Patents (Amendment) Act, 2005 extended product patent protection to pharmaceuticals, agrochemicals, and food products in compliance with TRIPS, while using permitted flexibilities — particularly Section 3(d) — to protect public health.
Section 84 allows any interested person to apply for a compulsory licence after three years from grant if the invention is not being worked in India, is not reasonably available, or is not available at an affordable price.
The Bolar exception under Section 107A allows generic manufacturers to conduct regulatory approval activities before patent expiry — enabling immediate market entry once the patent expires.
Section 64 provides a comprehensive list of grounds on which any interested person may seek revocation of a patent — including through a counter-claim in infringement proceedings.
Following the abolition of the IPAB in 2021, patent appeals and infringement actions are now heard by the relevant High Courts.
India's international obligations under the Paris Convention (12-month priority) and the PCT (31-month national phase entry) are incorporated in Chapter XXII of the Act.
FREQUENTLY ASKED QUESTIONS
1. What is the Patents Act, 1970?
The Patents Act, 1970 is India's primary legislation governing patents — the legal rights granted to inventors in exchange for full public disclosure of their inventions. It came into force on 20 April 1972, replacing the colonial-era Indian Patents and Designs Act, 1911, and has been significantly amended, most importantly by the Patents (Amendment) Act, 2005.
2. What are the three conditions for a patentable invention in India?
An invention must satisfy three conditions to be patentable in India: novelty (it must not have been disclosed anywhere in the world before the priority date); inventive step (it must not be obvious to a person skilled in the relevant art); and industrial applicability (it must be capable of being made or used in some kind of industry). All three conditions must be independently satisfied.
3. What is Section 3(d) of the Patents Act and why is it important?
Section 3(d) provides that the mere discovery of a new form of a known substance — including a new salt, ester, polymorph, or other derivative — is not patentable unless the applicant demonstrates that the new form has significantly enhanced efficacy compared to the known substance. This provision was specifically designed to prevent pharmaceutical evergreening — the practice of obtaining successive 20-year patents on minor modifications of existing drugs without genuine therapeutic benefit.
4. What is the term of a patent in India?
The term of a patent in India is 20 years from the date of filing of the application (Section 53). For international applications filed under the Patent Cooperation Treaty, the term is 20 years from the international filing date. The patent must be maintained by payment of annual renewal fees — failure to pay results in lapsing of the patent.
5. What is the difference between a provisional and a complete specification?
A provisional specification is a preliminary document filed to secure a priority date while the invention is still being developed. It contains a description of the invention but does not include final claims. A complete specification — which includes the final, defined claims — must be filed within 12 months of the provisional specification. Failure to file the complete specification within this period results in the application being deemed abandoned.
6. What is a compulsory licence under the Patents Act?
A compulsory licence is an authorisation granted by the Controller of Patents to a person other than the patent holder to manufacture, use, or sell the patented invention — without the patent holder's consent. Under Section 84, any interested person may apply for a compulsory licence after three years from the date of grant if the reasonable requirements of the public are not satisfied, the invention is not available at a reasonably affordable price, or the invention is not being worked in India.
7. What is the Bolar exception under the Patents Act?
The Bolar exception in Section 107A(a) provides that any act of making, constructing, using, selling, or importing a patented invention solely for uses reasonably related to developing information required under any law for the regulation, manufacture, or sale of any product is not patent infringement. This allows generic pharmaceutical companies to conduct bioequivalence studies and regulatory submissions before a patent expires, enabling immediate market entry upon expiry.
8. What are the grounds for revocation of a patent in India?
Under Section 64, a patent may be revoked on multiple grounds including: the invention was wrongfully obtained; the invention was already publicly known or used in India before the application date; the invention lacks novelty or inventive step; the subject matter is not patentable; the specification insufficiently describes the invention; the applicant failed to disclose required information about foreign applications; or the invention relates to atomic energy.
9. What is the difference between pre-grant and post-grant opposition?
Pre-grant opposition under Section 25(1) may be filed by any person after publication of the application and before grant, on specified grounds. Post-grant opposition under Section 25(2) may only be filed by a "person interested" within one year of publication of the grant, on broadly similar grounds. A successful pre-grant opposition prevents the patent from being granted; a successful post-grant opposition results in revocation of the granted patent.
10. Can a resident of India file a patent application abroad before filing in India?
Under Section 39, a person resident in India cannot file a patent application abroad for the same invention before filing in India — or within six weeks of filing in India — without first obtaining written permission from the Controller. Violation of this provision may result in the Indian application being deemed abandoned and constitutes a criminal offence under Section 118.
11. What is the significance of Section 8 of the Patents Act?
Section 8 requires applicants who are pursuing corresponding patent applications in foreign countries to disclose details of those foreign applications — including prior art cited against them and amendments made — to the Indian Controller. Failure to comply with this obligation, or providing false information, is a ground for revocation of the granted patent under Section 64.
12. What is a patent of addition?
A patent of addition is a form of protection for improvements or modifications to an existing patented invention. It does not need to involve an inventive step distinct from the main invention (though it must be novel), runs concurrently with the main patent, and expires when the main patent expires. It may be converted into an independent patent under Section 55.
13. Who can file an opposition to a patent application or granted patent in India?
Any person — with no requirement to establish a particular interest — may file a pre-grant opposition under Section 25(1). Post-grant opposition under Section 25(2) is limited to a "person interested" — defined broadly to include any person engaged in or promoting research in the field related to the patented invention. Revocation petitions under Section 64 may be filed by any person interested or the Central Government.
14. What happens to a patent if the renewal fee is not paid?
A patent lapses if the annual renewal fee is not paid by the due date. The patentee may apply for restoration within 18 months of the date of lapsing, provided they can demonstrate that the failure to pay was unintentional and that there has been no undue delay in applying for restoration. If restoration is granted, it is subject to conditions protecting persons who began exploiting the invention during the lapse period.
15. What is the PCT and how does it relate to Indian patent filings?
The Patent Cooperation Treaty (PCT) allows an inventor to file a single international application designating multiple member countries. An international PCT application designating India is treated as a national Indian application from the date of international filing, provided the applicant enters the Indian national phase — by filing the required national phase documents and paying the prescribed fees — within 31 months of the priority date. The 20-year patent term runs from the international filing date.