Pre-Grant vs Post-Grant Patent Opposition in India
Two routes, two clocks. How pre-grant and post-grant opposition work under section 25 of the Patents Act, which form to use, and how to keep track of every deadline.
Explainer · Patents · Last verified October 2026
A patent application in India can be challenged by a stranger before it is granted, and the granted patent can be challenged again within a year. These are two different routes, with different forms, different clocks and different people deciding them. Missing a date in either route can end your case. This explainer shows how pre-grant and post-grant opposition work under section 25 of the Patents Act, 1970, what each deadline is, and how to track them without a spreadsheet. Last verified October 2026.
- Pre-grant opposition: s.25(1), Form 7A, Rule 55, after publication and before grant, open to any person.
- Post-grant opposition: s.25(2), Form 7, within 12 months of publication of grant, for a person interested.
- Opposition Board: reports within 2 months under Rule 56 (as amended in 2024).
- Last verified: October 2026.
01Why two routes confuse people
Indian patent law lets third parties push back on a patent at two separate points. The first is before the patent is granted. The second is in the first year after grant. Both sit in section 25 of the Patents Act, which is why they are often mixed up.
The clocks are not the same
Pre-grant opposition has no fixed end date of its own. It can be filed any time after the application is published and before the patent is granted. Post-grant opposition has a hard window of 12 months from the date the grant is published in the patent journal. If you file late, the Controller will not hear you.
The forms and the decision-makers differ
A pre-grant opposition is a representation, filed on Form 7A, and the Controller decides it. A post-grant opposition is filed on Form 7, and an Opposition Board of three members first reports on it. Using the wrong form or the wrong route wastes time you may not have.
Rules changed in 2024
The Patents (Amendment) Rules, 2024 shortened several timelines, including the reply period in pre-grant opposition and the Opposition Board report period. Older articles still quote the earlier periods, so check the date on anything you read.
The quick answer
Pre-grant opposition: file Form 7A under s.25(1) after publication and before grant. Post-grant opposition: file Form 7 under s.25(2) within 12 months of publication of grant. Different forms, different clocks.
02Pre-grant opposition under section 25(1)
Pre-grant opposition lets any person file a representation against a pending application after it is published and before the patent is granted. It is the cheaper and faster route, and it works well when you spot a weak application early.
Who can file and on what grounds
Section 25(1) allows any person to file. You do not need to show that you are affected. The grounds are listed in the section and include prior publication, prior claiming, prior public knowledge or use, lack of inventive step, subject matter that is not an invention or is excluded, insufficient disclosure, and non-disclosure of foreign filing details under section 8.
How it runs
- The opponent files the representation on Form 7A under Rule 55, with a statement and evidence, and sends a copy to the applicant.
- The Controller first decides whether a prima facie case is made out. After the 2024 changes, this check comes before the applicant is asked to respond.
- If it is, the applicant gets notice and must file a reply statement and evidence within two months of the notice (earlier this was three months).
- The opponent may file evidence in reply, a hearing is held if either side asks, and the Controller ordinarily passes an order within one month of completing these steps.
There is also a protection window. A patent cannot be granted until six months have passed from publication of the application, which gives opponents time to prepare.
One limit matters. The opponent in a pre-grant case is not a party to later proceedings in the same way. The opponent cannot normally appeal the grant directly, though the opponent can still use the post-grant route within its window.
03Post-grant opposition under section 25(2)
Post-grant opposition lets a person interested challenge a granted patent within 12 months from the date of publication of the grant. It is more formal, because the patent already exists and the patentee has rights to defend.
Who can file
Section 25(2) says any person interested. This is a narrower group than pre-grant. Competitors, licensees and researchers in the same field usually qualify.
How it runs
- The opponent files Form 7 with a written statement of opposition and evidence, within 12 months of publication of grant.
- The Controller constitutes an Opposition Board of three members and sends it the documents.
- Under Rule 56, the Board gives its report within two months of the documents being forwarded (earlier three months, shortened in 2024).
- The patentee files a reply statement and evidence, the opponent may reply, and the Controller holds a hearing and passes a reasoned order.
The order can uphold the patent, require amendments, or revoke the patent. A losing party can challenge the order in the High Court.
Pre-grant is open to anyone and has no deadline except grant. Post-grant is open to a person interested and closes 12 months after the grant is published.
04Side-by-side comparison
| Point | Pre-grant opposition | Post-grant opposition |
|---|---|---|
| Section | s.25(1) | s.25(2) |
| Form | Form 7A (Rule 55) | Form 7 (Rule 57) |
| Who can file | Any person | Any person interested |
| When | After publication, before grant | Within 12 months of publication of grant |
| Who examines it | Controller | Opposition Board (report within 2 months under Rule 56), then Controller |
| Applicant or patentee reply | 2 months from notice (Rule 55, as amended 2024) | Reply statement and evidence after Board stage |
| Typical use | Stop a weak application early | Challenge a granted patent in a lighter forum than a revocation case |
05Which route should you pick
If the application is still pending, pre-grant is usually the first move. It costs less, and a successful opposition stops the grant before it creates rights.
If the patent is already granted and 12 months have not passed, post-grant opposition is open. Think about it early, because evidence gathering and expert reports take time.
If the 12 months have passed, opposition is no longer available. The remaining routes are revocation and, in some cases, compulsory licensing. Those are covered in our guide to patent revocation and compulsory licensing.
Also check what your own side disclosed. If you are the applicant, a prior disclosure may change how an opposition goes. See grace period and prior disclosure under Form 31.
06What happens after opposition
An opposition ends in an order. The Controller may refuse the application, grant it with amendments, or reject the opposition. In post-grant cases the order may maintain, amend or revoke the patent.
Opposition also often runs next to court cases. A patentee may sue for infringement while an opposition is pending, and the defendant may use the opposition grounds as a defence. Orders in these suits come from the High Court Intellectual Property Divisions, so a team following one matter usually needs to watch both the patent office record and the court record.
07Tracking opposition deadlines
Opposition work is a calendar problem. You track the publication date, the 12-month post-grant window, the reply periods after notice, the Board report date and the hearing date. A missed date is hard to fix.
What a practical tracker needs
- Application and grant publication dates from the patent journal.
- A countdown to the end of the 12-month window for each granted patent you watch.
- Hearing dates and compliance deadlines for matters you already have.
- A link to related court matters, including High Court IP Division cases.
Law firms with very large patent portfolios and global filings often use specialist docketing systems. Anaqua, Clarivate and Dennemeyer are known names for global multi-jurisdiction docketing and annuities, and Iolite and JSK serve high-volume specialist IP-firm docketing. If your firm is first and foremost a patent boutique with that kind of volume, they are worth a look.
If you want to compare tools for this job, see alternatives to Niyam for IP tracking.
08Where Claw fits
Claw is an all-in-one legaltech platform for Indian advocates, law firms, and corporate legal teams, combining AI-based case search, an AI legal assistant (Legal GPT), case management, and compliance automation across all Indian courts and tribunals.
Opposition at the patent office often runs beside an infringement suit in court, so a team needs to watch both records. Claw tracks cases, orders and hearings across 9,102 courts, benches and forums, searches 30 crore+ judgments with Supreme Court records from 1950 and High Courts from 1990, and returns results in under 5 seconds, so you can follow the court side of an opposed patent, or see how a court has read a ground you plan to raise. Claw does not use customer documents to train AI models.
Create a FREE Claw account to track patent disputes and the judgments behind them. To search the wider body of law, see case search across Indian courts.
09Sources and further reading
Check every section, rule and form number against the primary text before you file. This page was last verified in October 2026.
- Patent office and forms: ipindia.gov.in
- Patents Act, 1970 (section 25): indiankanoon.org
- WIPO, India IP law resources: wipo.int
- Claw: clawlaw.in
This page is general information, not legal advice. Rule timelines changed in 2024, so confirm the current text.
10Frequently asked questions
What is the difference between pre-grant and post-grant opposition in India?
Pre-grant opposition is filed under s.25(1) on Form 7A after publication and before grant, and any person can file it. Post-grant opposition is filed under s.25(2) on Form 7 within 12 months of publication of grant, by a person interested. The Controller decides the first, and an Opposition Board reports on the second before the Controller decides.
What is the time limit for post-grant opposition?
You must file within 12 months from the date of publication of grant in the patent journal. After that, the opposition route is closed. Other routes such as revocation remain.
How long does the Opposition Board take to report?
Under Rule 56, as amended in 2024, the Board gives its report within two months of the documents being forwarded to it. The earlier period was three months.
How long does an applicant get to reply to a pre-grant opposition?
Two months from the date of notice under Rule 55 after the 2024 amendment, earlier three months. A patent also cannot be granted until six months after publication of the application. Confirm the current rule text before relying on a date.
Can anyone file a pre-grant opposition?
Yes. Section 25(1) allows any person to file a representation, and no interest has to be shown. Post-grant opposition is narrower and needs a person interested.
Can I track patent opposition dates and related court cases in one place?
Yes, to a large extent. Claw tracks patent matters from IP India, including pending compliances and hearings, and follows related IP litigation across Indian courts. Global docketing and annuity management for many countries is better served by specialist suites.