Rule 55A of the Patents Rules, 2003
Filing of notice of opposition
Rule 55A fixes how a post-grant opposition starts: a notice of opposition in the prescribed form, filed within the statutory one-year window.
Official legal text
The verbatim statutory text of this provision is reproduced from the official source and checked by our legal reviewer before it is published here. Until that check is complete for this page, read the exact wording directly from the official source linked below — it is the only version that governs.
Treat this page as a guide. The provision as officially published, along with the Gazette notifications that apply to it, remains the governing text and overrides any simplification here.
What this rule requires, step by step
Once a patent is granted and the grant is published, the challenge route changes. Section 25(2) allows a person interested to oppose the granted patent, and Rule 55A is the doorway into that procedure. It requires the challenge to begin with a formal notice of opposition in Form 7, filed at the appropriate office with the fee prescribed in the First Schedule, and a copy sent to the patentee. This is a proper adversarial proceeding before the Controller, not a simple objection letter.
The phrase person interested is doing real work here. It is defined in the Act and covers a person engaged in, or promoting, research in the same field as the invention, and in practice includes competitors, manufacturers, research institutions and trade bodies whose activities are affected by the patent. Someone with no connection to the field cannot use this route, which is the main difference from a pre-grant representation under section 25(1), where any person may act.
The window is one year from the date of publication of the grant of the patent. That period comes from section 25(2) itself, so it is a statutory limit and cannot be enlarged in the way many procedural periods under the Rules can. Missing it does not leave the challenger without options, because revocation under section 64 before the High Court remains available, but revocation is slower and far more expensive than opposition before the Controller.
Rule 55A works together with the rules that follow it. The notice does not travel alone: under Rule 57 the opponent sends the written statement setting out the nature of its interest, the facts relied on and the relief sought, along with the evidence, at the same time. Filing a bare notice and promising to send the substance later is a common and damaging error. Once the notice is on record the Controller constitutes an Opposition Board under Rule 56, and the timetable for the reply statement, reply evidence, hearing and costs begins to run.
Why this rule matters
Competitors, manufacturers, research bodies and any other person interested who wants a granted Indian patent cancelled or narrowed.
In the twelve months after the grant of the patent is published in the Official Journal.
A right for a person interested to have a granted patent re-examined by the Controller, and a duty to start that challenge in the prescribed form.
Missing the year leaves only revocation before the High Court, which costs far more and takes far longer.
How it works in practice
A jute technology firm watches the Journal
Hooghly Jute Tech monitors the Official Journal every week because several of its processes sit close to patents filed by rivals. In March it sees that a patent has been granted to Aravalli Cement Works for a fibre treatment method that Hooghly believes was described in a conference paper years earlier. Being a manufacturer working in the same field, the company clearly qualifies as a person interested. Its patent agent notes the publication date of the grant and diarises the one-year limit immediately, then works backwards to build the file. By August the agent files Form 7 with the prescribed fee at the appropriate office, together with a written statement explaining the company's interest, the grounds relied on and the relief sought, plus affidavit evidence exhibiting the conference paper with proof of its publication date. A copy goes to the patentee. Because the notice, statement and evidence went in as one complete package, the Controller is able to send the papers to the Opposition Board without delay.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- Post-grant opposition starts with a notice of opposition in Form 7 with the prescribed fee.
- Only a person interested, as defined in the Act, may file it.
- The notice must be filed within one year from the date of publication of the grant.
- A copy of the notice must go to the patentee.
- The written statement and evidence under Rule 57 are filed along with the notice, not later.
- If the year is missed, revocation under section 64 before the High Court is the remaining route.
Common mistakes and misunderstandings
- Counting the one year from the date of grant instead of from the date the grant was published. Always work from the publication in the Official Journal.
- Filing the notice alone and holding back the statement and evidence. The package must be complete, and a bare notice invites the opposition to fail at the threshold.
- Assuming anyone can file. Post-grant opposition is limited to a person interested, and the written statement must explain the nature of that interest.
- Expecting an extension of the one-year period. It comes from the Act itself and is not a rule-made period that the Controller can enlarge.
- Treating post-grant opposition and revocation as interchangeable. They differ in forum, cost, timing and the grounds available.
Connected provisions
Rules are made under the Act, not alongside it. That is why the connected sections appear in a block of their own. Reading the section tells you why the procedure exists, and reading the rule tells you the steps, forms and periods that put it into effect.
Forms, deadlines and fees
Forms used under the Patents Rules are prescribed in the Second Schedule. They are revised when the Rules change, so download the current version from the Patent Office website rather than reusing a copy saved earlier.
- A notice of opposition must be filed within one year from the date of publication of the grant of the patent.
- The written statement and the opponent's evidence go in together with the notice.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
Any official fee connected with this provision is fixed by the First Schedule to the Patents Rules, not by the provision itself. The amount depends on who the applicant is and on whether the filing is made online or on paper, so no figures are reproduced here. How Indian patent fees work.
Amendment history
What changed in this provision, newest first. Read the footnotes in the official consolidated text for the full record.
- 2005The Patents (Amendment) Rules, 2005The rule was inserted to work the new post-grant opposition, requiring a notice of opposition in the prescribed form at the appropriate office.
Compiled from official consolidated texts and Gazette notifications. See the site-wide change log.
Related judgments
Court decisions shape how this provision is applied, but a summary is useful only if it is right. Every case note on this site is read by a legal reviewer before it goes live, and none has been completed for this provision so far. This section will fill in as those reviews finish. How case notes are prepared.
Questions people ask about Rule 55A
Who counts as a person interested for post-grant opposition?
The Act defines a person interested to include anyone engaged in, or promoting, research in the same field as the invention. In practice the Controller looks for a genuine commercial or research connection, such as a manufacturer of competing goods, a company whose product may infringe, a research institution working in the area, or an industry association acting for such members. The written statement filed with the notice must set out the nature of that interest, so explain it clearly with facts rather than a bare assertion.
What is the difference between pre-grant and post-grant opposition?
Pre-grant opposition is a representation under section 25(1) filed in Form 7A before the patent is granted, and any person may file it. Post-grant opposition is a formal proceeding under section 25(2) started by a notice in Form 7 within one year of publication of the grant, and only a person interested may file it. Post-grant opposition has a fuller procedure with an Opposition Board, exchange of evidence, a hearing and costs, and its outcome carries a statutory right of appeal.
Can I file both a pre-grant representation and a post-grant opposition?
Yes, the two routes are separate and one does not bar the other, although raising the same ground twice with the same evidence rarely helps. Many challengers use a pre-grant representation to try to narrow claims early and cheaply, then keep stronger evidence for a post-grant opposition if the patent is still troublesome after grant. Plan the sequence deliberately, because evidence disclosed early gives the applicant time to prepare an answer.
What happens after the notice of opposition is filed?
The Controller notifies the patentee and constitutes an Opposition Board of examiners to consider the documents and make a recommendation. The patentee may file a reply statement and evidence within two months of receiving the opponent's papers, and the opponent may then file reply evidence strictly confined to the patentee's evidence within one month. Further evidence needs the Controller's leave. A hearing follows, and the Controller then decides whether to maintain, amend or revoke the patent.
A rival patent was just granted. What are your options?
MYCrave Consultancy assesses the grounds and files post-grant oppositions within the one-year window.
You will be speaking with MYCrave Consultancy & Services, the firm that operates this platform. General questions are answered free; matter‑specific work is quoted before anything is done.