Patent Revocation in Chennai Office

Patent revocation (also called patent invalidation) is the legal process of having a granted patent declared invalid and removed from the patent register. Under Section 64 of the Patents Act, 1970, a revocation petition can be filed before the Intellectual Property Appellate Board (IPAB) or, in certain counter-claim situations, before a High Court. The grounds for revocation are identical to the grounds for patent opposition (Section 25) but are available at any time during the patent’s lifetime — there is no one-year time limit. Revocation is the nuclear option in patent disputes. It is typically pursued when a competitor’s patent is blocking your product launch, when you are defending a patent infringement suit by challenging the validity of the plaintiff’s patent, or when a patent holder is asserting rights that are broader than what was actually invented. The revocation petition must establish, with evidence, that the patent does not meet one or more of the patentability criteria — novelty, inventive step, or industrial application — or that it falls within the Section 3 exclusions, or that it was obtained through fraud or non-disclosure of material information. The revocation process is adversarial and technically rigorous. The petitioner must present a detailed invalidity case supported by prior art documents (patents, research papers, product manuals, public disclosures), technical arguments showing that the invention was obvious or anticipated, and legal arguments on the proper interpretation of the patent claims. The patent holder (respondent) defends the patent’s validity. The IPAB hears both sides and issues a final order that can be further appealed to the High Court. The entire process typically takes 2 to 4 years.