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Patent Revocation

Patent revocation is the legal process of cancelling a granted patent in India under the Patents Act, 1970. We advise...

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Key takeaways

Patent revocation is the cancellation of a granted patent under the Patents Act, 1970, removing the exclusive rights it conferred.
The main route is a revocation petition under Section 64, alongside post-grant opposition under Section 25(2) and revocation as a counter-claim in an infringement suit.
Following the Tribunals Reforms Act, 2021, revocation petitions are now heard by the High Courts after the abolition of the IPAB.
Common grounds include lack of novelty, obviousness, insufficient disclosure, non-patentable subject matter and wrongful obtainment.
A revocation challenge can be brought by an interested person, the Central Government, or a defendant in an infringement action.
The process is technical and evidence-heavy, demanding both legal pleadings and expert prior-art analysis.

Overview

What is patent revocation?

Patent revocation is the legal process by which a patent that has already been granted is cancelled, in whole or in part, by a competent authority. Once revoked, the patent ceases to confer any exclusive rights, and the invention it covered can be freely used by anyone.

A granted patent is not unchallengeable. The Patents Act, 1970 deliberately keeps the door open for third parties and the State to question a patent that should never have been granted, or that no longer satisfies the conditions for protection. Revocation is the mechanism that keeps weak, overbroad or wrongly obtained patents from blocking legitimate competition and innovation.

Why a granted patent may be challenged

The invention was already known or published before filing
The claims are obvious to a skilled person in the field
The specification does not disclose the invention sufficiently
The subject matter is not patentable under the Act
The patent was obtained wrongfully or by misrepresentation
A competitor needs to clear the way for its own product

Legal routes

Ways to revoke a patent

The Patents Act, 1970 provides more than one route to challenge a granted patent. The right one depends on timing, who you are and whether litigation is already on foot.

Route	When it applies
Post-grant opposition (Section 25(2))	Within 12 months of publication of the grant, by any person interested.
Revocation petition (Section 64)	Any time during the life of the patent, before the High Court.
Counter-claim in infringement suit	Raised by a defendant when sued for infringement.

Other provisions	What it covers
Section 65	Revocation in respect of inventions relating to atomic energy.
Section 66	Revocation by the Central Government in the public interest.
Section 85	Revocation for non-working after a compulsory licence.

Section 64

Common grounds for revocation

Section 64 of the Patents Act, 1970 sets out the grounds on which a granted patent may be revoked. The most frequently argued grounds are below.

Lack of novelty

The invention was anticipated by prior publication, prior use or prior claiming before the priority date.

Obviousness

The invention lacks an inventive step and is obvious to a person skilled in the art.

Not patentable

The subject matter falls within the non-patentable categories under Sections 3 and 4.

Insufficient disclosure

The specification does not describe the invention fully or fairly enough to be worked.

Wrongful obtainment

The patent was obtained wrongfully, or in fraud of the rights of the true owner.

Non-disclosure of foreign filings

Failure to disclose information on corresponding foreign applications under Section 8.

Standing

Who can file for revocation

Not everyone can challenge a patent. The Act limits standing to those with a genuine stake, although the routes differ in who they admit.

Any person interested: a competitor, manufacturer or research body engaged in the same field of activity
A defendant: a party sued for infringement, who may seek revocation as a counter-claim
The Central Government: where the patent is mischievous to the State or prejudicial to the public
The true owner: where the patent was wrongfully obtained by another

The expression “person interested” is read broadly and includes anyone with a manufacturing, trading or research interest that is affected by the patent.

How it works

The revocation process, step by step

The forum and procedure depend on the route you choose. Post-grant opposition is decided by the Controller at the Indian Patent Office; revocation petitions and counter-claims are decided by the High Court.

Post-grant opposition

Notice of opposition
File the notice in the prescribed form before the Controller within 12 months of publication of the grant.
Written statement and evidence
Set out the grounds, supported by prior art and expert evidence; the patentee files a reply.
Opposition Board
A board of examiners reviews the submissions and makes a recommendation to the Controller.
Hearing and order
The Controller hears both sides and may maintain, amend or revoke the patent.

Revocation petition

Assess and search
Confirm standing, identify the strongest grounds and assemble prior art and technical evidence.
File the petition
A revocation petition under Section 64 is filed before the High Court of competent jurisdiction.
Pleadings and evidence
Parties exchange pleadings, expert affidavits and documents, and the matter proceeds to arguments.
Judgment
The Court may revoke the patent wholly or in part, or dismiss the petition.

Paperwork

Documents & evidence

Certified copy of the granted patent and its complete specification
Prior-art documents: earlier patents, publications and product literature
Expert affidavits on novelty, inventive step and sufficiency
Evidence of prior public use or prior claiming, where relevant
Documents establishing the petitioner’s interest or standing
Section 8 records on corresponding foreign applications
Pleadings, statement of grounds and supporting submissions

Forum & timeline

Where it is heard

Post-grant opposition: the Controller of Patents at the Indian Patent Office.
Revocation petition (Section 64): the High Court, after the abolition of the IPAB under the Tribunals Reforms Act, 2021.
Counter-claim: the High Court hearing the infringement suit.
Timelines vary widely with the forum, the complexity of the technology and the volume of evidence.

Protecting or asserting IP instead? See our Indian Patent Search, Trademark Registration and Copyright Registration services.

Why it matters

Benefits of a revocation strategy

Clear the way

Remove an invalid patent that blocks your product, process or market entry.

Defend against infringement

Use revocation as a counter-claim to neutralise an infringement suit.

Restore fair competition

Stop overbroad or wrongly granted patents from distorting the market.

Negotiating leverage

A credible challenge strengthens your hand in licensing and settlement talks.

Freedom to operate

Give your R&D and commercial teams certainty to invest and launch.

Public interest

Keep genuinely new inventions protected and weak monopolies out.

Why Diligence Certifications

A partner for patent challenges

Patent revocation sits at the intersection of technical analysis and litigation. It demands a rigorous prior-art search, precise grounds and disciplined pleadings before the right forum. We bring all three together.

Grounds assessment: we test each ground under Section 64 against the evidence before you commit
Prior-art search: structured searches to build a defensible novelty and obviousness case
End-to-end representation: from post-grant opposition before the Controller to petitions before the High Court
Coordinated strategy: aligned with any infringement litigation or licensing negotiation in play

Facing a patent that should not stand?

Tell us about the patent and your situation, and we will assess the grounds, the right route and a realistic strategy for revocation.

Talk to a patent expert

Official source

Patent revocation proceedings are dealt with by Intellectual Property India.

FAQ

Frequently asked questions

What is patent revocation?

Patent revocation is the cancellation of a granted patent by a competent authority under the Patents Act, 1970. Once revoked, the patent stops conferring any exclusive rights, and the invention can be used freely.

What are the grounds for revoking a patent in India?

Section 64 lists the grounds, which include lack of novelty, lack of inventive step (obviousness), insufficient disclosure, non-patentable subject matter, wrongful obtainment and failure to disclose foreign filing information under Section 8.

Who can file for revocation of a patent?

A revocation petition can be filed by any person interested, by a defendant as a counter-claim in an infringement suit, or by the Central Government in the public interest.

What is the difference between post-grant opposition and a revocation petition?

Post-grant opposition under Section 25(2) must be filed before the Controller within 12 months of publication of the grant. A revocation petition under Section 64 can be filed at any time during the life of the patent before the High Court.

Which forum hears patent revocation cases now?

After the abolition of the Intellectual Property Appellate Board (IPAB) under the Tribunals Reforms Act, 2021, revocation petitions and counter-claims are heard by the High Courts, while post-grant opposition is decided by the Controller of Patents.

Can a patent be revoked only in part?

Yes. A patent may be revoked wholly or in respect of specific claims, depending on which claims are found invalid on the grounds raised.

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