Pre-Grant Opposition
Section 25(1)Opposition filed after publication of a Patent application but before grant. Any person can file without demonstrating specific interest.
Before grant
Patent Opposition & Revocation
Services for challenging patent validity through opposition and revocation proceedings, and defending patents against such challenges
Pre-grant opposition, post-grant opposition, and revocation proceedings.
Practice Overview
Patent opposition and revocation are legal mechanisms for challenging the validity of granted Patents or pending applications. These proceedings can be initiated by interested parties who believe a patent should not have been granted.
Under Indian Patent law, opposition can be filed at two stages: pre-grant opposition after publication but before grant, and post-grant opposition within 12 months of grant. Revocation proceedings can be initiated at the Intellectual Property Appellate Board or through counterclaims in infringement suits.
The practice handles both offensive actions (filing oppositions or revocation petitions on behalf of clients) and defensive actions (responding to oppositions or revocation proceedings filed against client patents). Services include prior art searching, ground identification, preparation of opposition documents, hearing representation, and appeal handling.
Opposition strategy depends on the specific circumstances, including the strength of available prior art, commercial significance of the patent, timeline considerations, and overall litigation or business strategy. The practice provides strategic guidance in addition to procedural handling.
Types of Proceedings
Different mechanisms for challenging patent validity under Indian law.
Post-Grant Opposition
Section 25(2)Opposition filed within 12 months after grant of patent. Must be filed by a "person interested" having legitimate interest.
Within 12 months of grant
Revocation by IPAB
Section 64Petition for revocation filed before the Intellectual Property Appellate Board (now handled by High Courts).
During Patent term
Revocation in Infringement Suit
Section 64Counterclaim for revocation filed in response to patent infringement proceedings.
During litigation
Grounds for Opposition
Statutory grounds on which patent validity can be challenged.
Prior Publication
The invention was publicly known or publicly used in India, or published before the priority date.
Prior Claiming
The invention is claimed in a Patent application filed in India with an earlier priority date.
Prior Knowledge/Use
The invention was publicly known or used in India before the priority date.
Obviousness
The invention is obvious and does not involve an inventive step having regard to prior art.
Non-Patentable Subject Matter
The invention falls within the exclusions of Section 3 or Section 4 of the Patents Act.
Insufficient Description
The specification does not sufficiently describe the invention or method to perform it.
Non-Disclosure of Information
Failure to disclose information regarding foreign applications as required.
Wrongful Obtaining
The patent was obtained wrongfully from the opponent or their predecessor.
Opposition Process
Typical workflow for filing or defending patent opposition.
Strategy Assessment
Evaluation of grounds, available prior art, commercial context, and likelihood of success.
Prior Art Search
Comprehensive search for prior art supporting opposition grounds.
Document Preparation
Drafting of opposition statement, evidence affidavits, and supporting documents.
Filing
Filing of opposition with the Patent Office within prescribed timelines.
Response Handling
Review of patentee response and preparation of reply evidence if needed.
Hearing
Representation at oral hearing before the Controller of Patents.
Strategy Assessment
Evaluation of grounds, available prior art, commercial context, and likelihood of success.
Prior Art Search
Comprehensive search for prior art supporting opposition grounds.
Document Preparation
Drafting of opposition statement, evidence affidavits, and supporting documents.
Filing
Filing of opposition with the Patent Office within prescribed timelines.
Response Handling
Review of patentee response and preparation of reply evidence if needed.
Hearing
Representation at oral hearing before the Controller of Patents.
Service Areas
Components of the patent opposition and revocation service offering.
Opposition Filing
Filing pre-grant and post-grant oppositions against third-party patents.
- Ground identification
- Prior art compilation
- Opposition drafting
- Evidence preparation
- Filing coordination
Opposition Defense
Defending client patents against opposition proceedings.
- Opposition review
- Prior art analysis
- Response preparation
- Counter-evidence
- Claim amendment strategy
Revocation Proceedings
Filing and defending revocation petitions.
- Revocation petition drafting
- Revocation defense
- High Court coordination
- Evidence handling
- Appeal management
Prior Art Search
Comprehensive searching for opposition prior art.
- Patent database searching
- Non-patent literature
- Public use evidence
- Prior publication search
- Date verification
Hearing Representation
Representation at Patent Office hearings.
- Hearing preparation
- Oral arguments
- Written submissions
- Controller interactions
- Outcome documentation
Strategic Advisory
Strategic guidance on opposition matters.
- Validity assessment
- Ground selection
- Timing considerations
- Settlement evaluation
- Appeal strategy
Key Timelines
Important deadlines in opposition proceedings.
Pre-Grant Opposition
Deadline: Before grant of patent
Trigger: After publication of application
Post-Grant Opposition
Deadline: 12 months from grant
Trigger: Publication of grant in Patent Journal
Reply to Opposition
Deadline: 3 months (extendable)
Trigger: Service of opposition notice
Evidence Filing
Deadline: As directed by Controller
Trigger: Controller order
Practice Characteristics
Aspects of the opposition and revocation practice.
Strategic Approach
Opposition strategy aligned with broader commercial and litigation objectives rather than purely procedural handling.
Prior Art Expertise
Thorough prior art searching to identify the strongest grounds and supporting evidence for opposition.
Technical Analysis
Detailed claim analysis and prior art mapping by technically qualified professionals.
Hearing Experience
Experience in oral advocacy before the Controller of Patents in opposition proceedings.
Timeline Management
Careful tracking of deadlines in multi-stage opposition proceedings.
Coordination
Coordination with litigation counsel where opposition is part of broader dispute strategy.
Frequently Asked Questions
Common questions about patent opposition and revocation
Pre-grant opposition can be filed by any person after publication of an application but before grant, without showing any specific interest. Post-grant opposition must be filed within 12 months of grant by a "person interested" demonstrating legitimate concern. Post-grant opposition involves more formal proceedings with constitution of an Opposition Board.
A "person interested" who has a stake in the matter. This typically includes competitors, potential licensees, persons engaged in research in the same field, or anyone whose commercial interests may be affected by the patent. The opponent must demonstrate their interest in the opposition.
Common grounds include:(1) lack of novelty due to prior publication or use;(2) obviousness/lack of inventive step;(3) insufficient disclosure in specification;(4) claiming non-patentable subject matter;(5) wrongful obtaining of invention; and(6) failure to disclose foreign filing information. Ground selection depends on available evidence.
The Controller considers the opposition and may provide an opportunity for the applicant to respond. If the opposition is found meritorious, the application may be refused. If the opposition is rejected, the application proceeds to grant. The opponent does not have appeal rights from pre-grant opposition decisions.
An Opposition Board is constituted to examine the opposition. Both parties can file evidence and written submissions. An oral hearing is typically conducted. The Controller issues a decision either maintaining, amending, or revoking the patent. Either party can appeal to the High Court.
Yes, the patentee may offer claim amendments during opposition to overcome the grounds raised. Amendments must not extend the scope of claims or add new matter. The Controller decides whether to accept amendments. Strategic claim amendment can sometimes preserve a narrower but valid patent.
In post-grant opposition, the Controller constitutes an Opposition Board comprising three members who examine the opposition and submit a recommendation. The Controller is not bound by the Board recommendation but must consider it when making the decision.
Post-grant opposition decisions can be appealed to the High Court. Pre-grant opposition decisions by the Controller are generally not appealable by the opponent, though the applicant can appeal a rejection. Revocation decisions can also be appealed.
Timeline varies based on Patent Office workload and complexity. Pre-grant opposition can delay grant by 6-18 months. Post-grant opposition typically takes 18-36 months from filing to decision, including evidence exchange and hearing. Complex cases or appeals extend timelines further.
Revocation is a petition to cancel a granted Patent, filed under Section 64 either before the High Court or as a counterclaim in infringement proceedings. Unlike post-grant opposition which has a 12-month limit, revocation can be filed anytime during the Patent term. Revocation involves court proceedings rather than Patent Office procedures.
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