Patent Revocation Proceedings under Section 64 of Patents Act 1970: High Court Counter-Claims, Grounds, and Invalidation Strategy

I. I. The Strategic Primacy of Patent Invalidation in Commercial Defense

In high-stakes patent litigation—whether concerning telecommunication standard essential patents (SEPs), oncology pharmaceuticals, or enterprise software systems—the filing of an infringement suit is invariably met with an immediate, existential counter-offensive: a petition or counter-claim for **Patent Revocation**.

A patent grant by the Indian Patent Office (IPO) carries no legal presumption of absolute statutory validity. Section 13(4) of the Patents Act, 1970 explicitly establishes that the examination and grant of a patent shall not be deemed to warrant its validity. Every granted patent remains permanently vulnerable to judicial revocation.

Section 64 of the Patents Act provides an exhaustive statutory catalog of grounds upon which a patent may be revoked. For a defendant facing an interlocutory injunction that threatens to shut down manufacturing operations, successfully dismantling the patent under Section 64 is the primary strategic imperative. This treatise deconstructs the procedural avenues, statutory grounds, and evidentiary tactics of Section 64 revocation.

II. II. Procedural Forums: Revocation Petition vs Counter-Claim in High Court

Under Section 64(1) of the Patents Act, a patent revocation proceeding can be initiated through two distinct procedural mechanisms by any 'person interested' or the Central Government:

1. **Standalone Revocation Petition**: Filed directly before the Intellectual Property Division (IPD) of the High Court having territorial jurisdiction over the appropriate Patent Office branch. This route is typically chosen by a commercial competitor seeking to clear the path prior to launching a competing generic or biosimilar product. 2. **Counter-Claim in an Infringement Suit**: When a patentee files an infringement suit before a District Court or High Court, Section 64(1) authorizes the defendant to file a Counter-Claim seeking the total revocation of the patent. Under the mandatory proviso to Section 104 of the Patents Act, if a counter-claim for revocation is filed in a suit pending before a District Court, **the entire suit along with the counter-claim must be transferred immediately to the High Court**.

This jurisdictional transfer ensures that patent validity is adjudicated exclusively by the specialized commercial benches of the High Court.

III. III. Foundational Grounds under Section 64(1): Anticipation and Obviousness

The core substantive grounds for invalidating a patent center upon novelty and inventive step:

**Lack of Novelty / Anticipation (Section 64(1)(e))**: Proving that the invention was publicly known or publicly used in India prior to the priority date, or was anticipated having regard to what was published in India or elsewhere. Counsel must demonstrate that every element of the asserted claim is disclosed in a single prior art document (the 'Prior Art Flag' doctrine). **Lack of Inventive Step / Obviousness (Section 64(1)(f))**: Establishing that the claimed invention does not involve any technical advancement or economic significance that would not have been obvious to a Person Skilled in the Art (POSITA). In the landmark Supreme Court ruling of *Biswanath Prasad Radhey Shyam v. Hindustan Metal Industries* (1979 2 SCC 511), the Court held that a mere workshop improvement or routine combination of known integers does not constitute an inventive step.

Defendants must synthesize prior art citations through technical expert testimony, proving that the claimed invention is an obvious design choice.

IV. IV. Fatal Non-Disclosures: Section 3 Exclusions and Section 64(1)(h) Insufficiency

Beyond novelty and obviousness, Indian patent law contains unique, lethal invalidation grounds that routinely strike down granted patents:

1. **Non-Patentable Subject Matter (Section 64(1)(k))**: Proving that the patent claims subject matter barred under Section 3—such as a computer program per se under Section 3(k), or a mere discovery of a new form of a known substance without enhanced therapeutic efficacy under Section 3(d). 2. **Insufficiency and Ambiguity of Specification (Section 64(1)(h) and (i))**: Proving that the complete specification does not sufficiently and clearly describe the invention and the method by which it is to be performed to enable a POSITA to replicate it without undue experimentation, or that the claims fail to clearly define the scope of monopoly.

A patent specification that deliberately withholds the best mode of execution or uses obscure, ambiguous claiming terminology violates Section 10(4) and is strictly revocable under Section 64(1)(h).

V. V. The Lethal Procedural Ground: Section 8 Non-Compliance and Section 64(1)(m)

One of the most potent weapons in Indian patent invalidation is **Section 64(1)(m)**: proving that the applicant for the patent has failed to disclose to the Controller the information required by Section 8, or has furnished information which in any material particular was false to their knowledge.

Under Section 8(1) and 8(2) of the Patents Act, an applicant filing corresponding foreign patent applications (in the USPTO, EPO, JPO, etc.) is under an affirmative, ongoing statutory duty to keep the Indian Controller updated regarding the status, claim amendments, and search/examination reports issued by foreign patent offices.

While recent judicial interpretations by the Delhi High Court (e.g., *Maj. (Retd.) Sukesh Behl v. Koninklijke Philips Electronics*) hold that revocation under Section 64(1)(m) is discretionary and requires material omission rather than trivial clerical delays, a deliberate failure to disclose a key foreign office action rejecting identical claims on prior art grounds provides decisive grounds for immediate patent revocation.

VI. VI. Chambers Patent Revocation and Invalidation Practice

Advocate Ritik Khurana Chambers provides specialized patent invalidation analysis, High Court revocation litigation, and defense representation before the Intellectual Property Division (IPD) of the Delhi High Court.

Our practice conducts global multi-jurisdictional prior art searches, drafts Section 64 counter-claims, cross-examines technical expert witnesses, and prosecutes Section 8 non-compliance petitions. In bet-the-company patent battles, our team delivers rigorous courtroom advocacy to dismantle predatory monopolies and defend commercial freedom to operate.