Patent Opposition in India: Pre-Grant and Post-Grant Challenges Explained

Patent opposition in India is an important mechanism through which a patent application or granted patent can be challenged on specified statutory grounds.

Filing a patent application does not automatically mean that a patent will be granted. Under Section 25 of the Patents Act, 1970, Indian patent law provides two important mechanisms for challenging patent rights:

Pre-Grant Opposition
Post-Grant Opposition

A pre-grant opposition is filed against a patent application before the patent is granted, whereas a post-grant opposition is filed after grant and within one year from the publication of the grant.

For inventors, startups, companies and competitors, understanding patent opposition proceedings in India, the applicable grounds, forms, timelines and evidence is essential.

What is Patent Opposition in India?

Patent opposition is a statutory procedure under Section 25 of the Patents Act, 1970 that allows specified challenges to be raised against the grant or continuation of patent rights.

The opposition process is intended to provide an opportunity to challenge patents where, for example, the invention lacks novelty or inventive step, falls within excluded subject matter, was wrongfully obtained, or suffers from other grounds specified under Section 25.

The two principal forms of opposition are:

Type of Opposition	When Can It Be Filed?	Who Can File?	Form
Pre-Grant Opposition	After publication but before grant	Any person	Form 7A
Post-Grant Opposition	Within 1 year from publication of grant	Any person interested	Form 7

The official Patent Rules identify Form 7A as the representation for opposition to grant and Form 7 as the notice of opposition.

What is Pre-Grant Opposition in India?

Pre-grant opposition is a challenge filed against a patent application before the patent is granted.

Under Section 25(1) of the Patents Act, 1970, any person may make a representation by way of opposition against the grant of a patent after the application has been published but before the patent is granted.

The representation is filed in Form 7A under Rule 55. It must contain the grounds of opposition and may be accompanied by supporting evidence and a request for hearing.

Important Point: Six-Month Period

Rule 55(1A) provides that a patent cannot be granted before the expiry of six months from the date of publication of the patent application under Section 11A.

The Controller considers a pre-grant representation when a request for examination has been filed.

Grounds for Pre-Grant Patent Opposition

Section 25(1) provides specific statutory grounds on which a pre-grant opposition may be made.

Depending on the facts, these include grounds such as:

Wrongful obtaining of the invention
Prior publication
Prior claiming
Prior knowledge or prior public use
Lack of novelty
Lack of inventive step
Non-patentable subject matter
Insufficient disclosure
Failure to disclose or wrongful disclosure of information required under the Act
Other grounds specifically provided under Section 25(1)

An opposition should not merely state that a patent “should not be granted.” The opponent should connect the factual and technical evidence to the particular statutory ground being relied upon.

How Does Pre-Grant Opposition Work?

The general process can be understood as follows:

Step 1: Patent Application Is Published

The patent application is published under Section 11A.

Step 2: Representation Is Filed

A person may file a representation against the grant in Form 7A under Rule 55.

Step 3: Request for Examination

The Controller considers the representation when the required request for examination has been filed.

Step 4: Prima Facie Assessment

The Controller considers whether the representation establishes a prima facie case.

Step 5: Applicant’s Response

Where the prescribed procedure requires it, the applicant may file a statement and evidence in support of the application.

Step 6: Hearing

Where requested and applicable, the parties may be given an opportunity of being heard.

Step 7: Decision

The Controller may reject the representation, require amendments, or refuse the grant, depending on the circumstances and applicable law. Rule 55 sets out the procedure for dealing with the representation.

What is Post-Grant Opposition in India?

Post-grant opposition is a statutory challenge against a patent after it has been granted.

Under Section 25(2), any person interested may give notice of opposition to the Controller after grant but before the expiry of one year from the date of publication of the grant of the patent.

The post-grant opposition is filed in Form 7 under Rule 55A.

Unlike pre-grant opposition, the statute specifically uses the expression “any person interested” for post-grant opposition.

How Does Post-Grant Opposition Work?

The post-grant opposition process generally involves the following stages:

1. Patent Is Granted

The patent is granted and the grant is published.

2. Opposition Is Filed

An eligible person files a notice of opposition within the statutory one-year period.

3. Form 7 Is Used

The notice is filed in Form 7 under Rule 55A.

4. Opposition Board Is Constituted

Under Section 25(3), the Controller constitutes an Opposition Board.

Rule 56 provides for an Opposition Board consisting of three members, with one member nominated as Chairman.

5. Evidence and Submissions

The opponent and patentee submit the prescribed statements, evidence and other documents.

6. Opposition Board’s Recommendation

The Opposition Board examines the opposition and submits its recommendation to the Controller.

7. Controller’s Decision

After considering the material and giving the parties an opportunity of being heard, the Controller may order that the patent be:

Maintained;
Amended; or
Revoked.

Section 25(4) expressly provides these possible outcomes.

Pre-Grant vs Post-Grant Opposition in India

Understanding the difference between pre-grant and post-grant opposition is important.

Feature	Pre-Grant Opposition	Post-Grant Opposition
Legal provision	Section 25(1)	Section 25(2)
Stage	Before patent grant	After patent grant
Eligibility	Any person	Any person interested
Form	Form 7A	Form 7
Rules	Rule 55	Rule 55A and related rules
Time limit	After publication and before grant	Within 1 year from publication of grant
Opposition Board	No post-grant Opposition Board mechanism	Yes
Possible outcome	Grant may be refused/amended	Patent may be maintained, amended or revoked

The statutory distinction between the two procedures is important when determining the appropriate remedy and filing strategy.

What Grounds Can Be Used to Oppose a Patent?

The grounds under Section 25 substantially concern issues such as:

1. Wrongful Obtaining

An opponent may contend that the applicant wrongfully obtained the invention from the opponent or a person through whom the opponent claims.

2. Prior Publication

The claimed invention may have been published before the relevant priority date.

3. Prior Claiming

The invention may already have been claimed in an earlier patent application in circumstances covered by Section 25.

4. Prior Knowledge or Public Use

Evidence of prior knowledge or public use may be relevant to the statutory grounds.

5. Lack of Novelty

If the claimed invention is already disclosed in relevant prior art, novelty may be challenged.

6. Lack of Inventive Step

An opponent may argue that the claimed invention lacks the required inventive step and would be obvious to a person skilled in the relevant art.

7. Non-Patentable Subject Matter

The invention may fall within the exclusions under Section 3 or Section 4 of the Patents Act.

8. Insufficient Disclosure

An opponent may challenge the specification where the invention has not been sufficiently or properly disclosed as required by law.

The precise statutory grounds and their application depend on the facts and the wording of the claims.

Evidence in Patent Opposition Proceedings

Patent opposition is not simply a matter of making allegations.

A strong opposition generally requires specific technical and documentary evidence.

For example, if an opponent relies on prior art, it is important to identify:

The prior-art document;
Its publication date;
The relevant disclosure;
The specific claim or claim features affected;
How the prior art anticipates the claim or contributes to an obviousness argument.

Simply submitting a large collection of patent documents without explaining their relevance may not adequately establish the opponent’s case.

The same principle applies to evidence relating to public use, prior knowledge, inventorship, disclosure and other statutory grounds.

Novelty and Inventive Step in Patent Opposition

Two of the most frequently raised issues in patent opposition are novelty and inventive step.

The Supreme Court in Biswanath Prasad Radhey Shyam v. Hindustan Metal Industries, (1979) 2 SCC 511, considered the principles of patentability and emphasized that a patentable invention must involve more than a mere workshop improvement.

Novelty

The question is essentially whether the claimed invention has already been disclosed in the relevant prior art.

Inventive Step

The question is whether the claimed invention represents a sufficient non-obvious technical advance over the prior art.

Because these are distinct legal tests, an opposition should clearly identify whether the challenge is based on lack of novelty, lack of inventive step, or both.

Patent Opposition vs Patent Infringement

Patent opposition and patent infringement proceedings are not the same.

Patent Opposition

Patent opposition concerns whether a patent should be granted or, in the case of post-grant opposition, whether the granted patent should be maintained, amended or revoked through the statutory opposition procedure.

Patent Infringement

Patent infringement proceedings generally concern alleged unauthorized use or exploitation of the patented invention.

Therefore:

Opposition = Challenge to grant or continuation of patent rights

Infringement = Dispute concerning unauthorized use of patent rights

The two areas can overlap in practice because the validity and scope of a patent may become important in patent litigation.

In Bajaj Auto Ltd. v. TVS Motor Company Ltd., (2009) 9 SCC 797, the Supreme Court considered issues relating to patent infringement and interim relief and emphasized the need for expeditious resolution of patent disputes.

Why Is Patent Opposition Important for Businesses?

Patent opposition can have significant commercial implications.

For a competitor or business, an improperly granted patent may create uncertainty around product development, manufacturing, licensing or market entry.

For an applicant or patentee, an opposition can require substantial legal and technical resources.

A patent opposition may therefore involve:

Patent attorneys
Patent agents
Technical experts
Prior-art researchers
Legal counsel
Documentary evidence
Claim analysis
Technical comparison

Patent opposition is consequently both a legal and technical exercise.

How Should an Opponent Prepare a Patent Opposition?

A well-prepared opposition should begin with a structured analysis.

Step 1: Study the Patent Claims

Identify exactly what the patentee is claiming.

Step 2: Identify Applicable Statutory Grounds

Map the facts and evidence to the relevant grounds under Section 25.

Step 3: Conduct Prior-Art Research

Search patents, patent applications, technical literature and other relevant sources.

Step 4: Prepare Claim Charts

Compare the patent claims with the relevant prior art.

Step 5: Collect Supporting Evidence

Gather documents and technical material supporting each ground.

Step 6: Address Each Claim Separately

Where appropriate, explain why specific claims fail the applicable patentability requirements.

Step 7: Comply With Procedural Requirements

Forms, timelines, evidence and hearing procedures should be carefully followed.

How Should a Patent Applicant or Patentee Respond to an Opposition?

For an applicant or patentee, an opposition should be treated seriously.

A response may require:

Careful claim construction;
Analysis of cited prior art;
Technical distinctions;
Evidence supporting patentability;
Appropriate amendments, where legally permissible;
Procedural compliance;
Preparation for hearing.

The response should address the opponent’s specific statutory grounds rather than merely asserting that the invention is innovative.

Common Mistakes in Patent Opposition

Some common mistakes include:

Filing an opposition without identifying precise statutory grounds;
Relying on irrelevant prior-art documents;
Failing to explain how prior art affects the claims;
Ignoring procedural timelines;
Confusing novelty with inventive step;
Filing insufficient technical evidence;
Making broad allegations without documentary support;
Failing to analyze individual claims;
Overlooking the distinction between pre-grant and post-grant opposition.

Because patent opposition involves both technical and legal questions, proper preparation is important.

Frequently Asked Questions About Patent Opposition in India

What is patent opposition in India?

Patent opposition is a statutory procedure under Section 25 of the Patents Act, 1970 through which a patent application or granted patent can be challenged on specified legal grounds.

What is pre-grant opposition?

Pre-grant opposition is a representation filed against the grant of a patent after publication of the application but before the patent is granted. It is filed in Form 7A under Rule 55.

Who can file a pre-grant opposition?

Under Section 25(1), any person may make a representation by way of opposition against the grant of a patent, subject to the statutory requirements.

What is post-grant opposition?

Post-grant opposition is a challenge filed after the patent has been granted. Under Section 25(2), it must be filed by any person interested within one year from publication of the grant.

Which form is used for patent opposition?

Form 7A is used for pre-grant opposition, while Form 7 is used for post-grant opposition.

What is the time limit for post-grant opposition?

A post-grant opposition must be filed before expiry of one year from the date of publication of grant of the patent.

Can lack of novelty be a ground for patent opposition?

Yes. Lack of novelty is one of the statutory grounds available under Section 25.

Can lack of inventive step be a ground for opposition?

Yes. Lack of inventive step is also among the statutory grounds for challenging a patent under Section 25.

Is patent opposition the same as patent infringement?

No. Patent opposition concerns the grant or continuation of patent rights under the statutory opposition mechanism, whereas infringement proceedings concern alleged unauthorized exploitation of patent rights.

Conclusion

Patent opposition in India provides an important mechanism for challenging patent rights before and after grant.

A pre-grant opposition under Section 25(1) can be filed after publication and before grant, while a post-grant opposition under Section 25(2) can be filed by any person interested within one year from publication of the grant.

The success of an opposition depends not merely on identifying a similar invention but on establishing the relevant statutory ground with specific legal, technical and documentary evidence.

For opponents, this means conducting detailed prior-art and claim analysis. For applicants and patentees, it means carefully addressing the cited prior art, statutory grounds and procedural requirements.

Ultimately, patent opposition is a combination of patent law, technical analysis, evidence and procedural strategy