Section 57 of the Patents Act, 1970
Amendment of application and specification before Controller
Section 57 lets an applicant or patentee ask the Controller for leave to amend an application, specification or related document.
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.
Nothing here replaces the statute. The official wording of the provision, together with any Gazette notification that applies to it, governs. This page only explains that material in ordinary language.
What this section says, in plain language
Specifications are drafted early, often before the technology has settled and always before the examiner's prior art is known. Section 57 provides the route for correcting them. An applicant or a patentee may apply to the Controller for leave to amend the application for a patent, the complete specification, or any document relating to them. The request must state the nature of the proposed amendment and give full particulars of the reasons for it.
Amendment is a matter of leave, not of right. The Controller may allow the amendment, refuse it, or allow it on conditions. The substantive limits on what can be allowed are in Section 59: an amendment must be by way of disclaimer, correction or explanation, must be for incorporating actual fact, must not introduce matter not in substance disclosed before, and must not take any claim outside the scope of a claim of the unamended specification. Section 57 supplies the machinery; Section 59 supplies the boundaries.
Transparency is built in. Where the application for the patent has already been published, the application for amendment and the nature of the proposed amendment are published as well. Any person interested may then give notice of opposition to the amendment within the period the Rules prescribe. If opposition is filed, the Controller notifies the applicant or patentee, hears both sides, and decides. The procedural detail sits in Rules 81 to 83, which cover how the request is made, how amended pages are prepared, and how an allowed amendment is published.
There is a jurisdictional cut-off that catches people out. The Controller cannot act under Section 57 while a suit for infringement of the patent, or a proceeding for revocation, is pending before a court. Once litigation is on foot, the amendment must be sought from that court under Section 58. A patentee who spots a weakness in the claims should therefore move early, because the option of a quiet amendment before the Controller closes as soon as proceedings begin.
Used well, Section 57 is a repair tool: narrowing an over-broad claim before it is attacked, correcting an obvious error in a description, deleting a claim that offends Section 3, or aligning an Indian specification with amendments made in a corresponding foreign case. Used carelessly, it can weaken a patent by narrowing more than necessary or by drawing attention to a defect, so proposed amendments deserve the same care as the original drafting.
Why this section matters
Applicants during prosecution, patentees strengthening or repairing a granted patent, and competitors watching for amendments to published cases.
At any stage before the Controller, during examination or after grant, but only while no infringement suit or revocation proceeding is pending.
A power in the Controller to allow amendments, a publication and opposition process, and a discretion to impose conditions.
A defect that could have been repaired cheaply becomes a revocation ground, and once litigation starts the simpler route before the Controller is no longer available.
How it works in practice
Narrowing a claim before trouble arrives
Ananya Rao holds a granted Indian patent on a method of treating industrial effluent using a layered filter. Her claim 1 says the filter medium is any porous ceramic. During a licensing discussion, a prospective licensee's search turns up an older Indian publication describing the same method with a porous ceramic medium, though not with the graded pore structure Ananya actually uses and describes in her examples. No litigation has started. Her agent applies to the Controller under Section 57 for leave to amend claim 1 to require the graded pore structure, setting out the nature of the amendment and full reasons. Because the application was published, the request and the nature of the amendment are published, and the period for opposition passes without a notice being filed. The Controller allows the amendment, and the amended pages are prepared under the Rules. Ananya now has a narrower but defensible claim, and the licence proceeds. Had a revocation petition been filed first, she would have had to seek the same amendment from the court under Section 58.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- An applicant or patentee may seek leave to amend an application, complete specification or related document.
- The request must state the nature of the amendment and give full reasons.
- Where the application has been published, the amendment request and its nature are also published.
- Any interested person may oppose the amendment within the prescribed period, and a hearing follows.
- The Controller may allow, refuse or impose conditions; the limits on allowable amendments are in Section 59.
- The Controller cannot act while an infringement suit or revocation proceeding is pending in court; Section 58 applies then.
- Rules 81 to 83 govern the procedure, amended pages and publication.
Common mistakes and misunderstandings
- Waiting until a revocation petition or infringement suit is filed. At that point the Controller can no longer deal with the amendment.
- Treating amendment as a chance to add new matter or broaden claims. Section 59 prohibits both, and the request will fail.
- Giving thin reasons in the request. The Act requires full particulars of the reasons, and a weak explanation invites refusal.
- Overlooking that a post-grant amendment request is published and can be opposed by a competitor watching the file.
Connected provisions
Indian patent law works in two layers. The Act carries the substance and the Rules carry the machinery. Because the layers are amended by different processes and at different times, they are presented in separate blocks instead of being merged into one description.
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.
- An amendment may be sought at any time before or after grant, but only while no infringement suit or revocation proceeding is pending before a court.
- Notice of opposition to a published amendment request must be given within the period prescribed by the Rules; check the current Patents Rules for the exact period.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
The official fee for anything described on this page is set out in the First Schedule to the Patents Rules. It is not the same for every applicant, and it is not the same for online and physical filing, which is why no amount is stated here. How Indian patent fees work.
Related judgments
Nippon A&L Inc. v. The Controller of Patents
C.A.(COMM.IPD-PAT) 11/2022 (Delhi High Court, judgment dated 5 July 2022)
Question before the courtWhether an applicant may convert product-by-process claims into process claims during examination without breaching the limits on amendment.
HeldThe Court allowed the appeal and held that such an amendment is not objectionable simply because the type of claim changes. What matters is whether the amended claims stay inside what the specification disclosed when it was first filed, and whether the scope has been narrowed rather than widened. Converting product-by-process claims into claims to the process alone met both requirements on the facts. The Court added that amendments made while an application is still being examined deserve a more liberal view than amendments sought after grant.
Citation details are being confirmed against an official report before this summary is treated as verified.
Case notes are written in our own words from the judgment and are published only after legal review. They are not advice and not a prediction about any other matter. All case notes.
Questions people ask about Section 57
Can I amend my patent specification after grant in India?
Yes. Section 57 allows a patentee to apply to the Controller for leave to amend the complete specification even after grant, provided no infringement suit or revocation proceeding is pending before a court. The request must state the nature of the amendment and the full reasons for it, and it is published so that interested persons can oppose. What can be allowed is limited by Section 59, which permits only disclaimer, correction or explanation, and forbids new matter or claims broader than the original ones.
Can I broaden my claims by amendment?
No. Section 59 requires that no amended claim fall outside the scope of a claim of the specification before amendment. In practice this means amendments narrow or clarify; they do not expand. If you need broader protection, that has to come from a separate application filed while the subject matter is still unpublished and within the relevant time limits, not from amending a case that is already on file. Attempts to broaden by amendment are refused and can damage credibility in later proceedings.
Who can oppose an amendment to a specification?
Where the application for the patent has been published, the application for amendment and the nature of the proposed amendment are published as well, and any person interested may give notice of opposition within the period prescribed by the Rules. The Controller then notifies the applicant or patentee and decides the matter after hearing both sides. Competitors who monitor a rival's file often use this route, because an amendment request is a public signal that the patentee thinks something in the specification needs fixing.
What if a court case has already started?
Then the Controller cannot deal with the amendment. Once a suit for infringement or a proceeding for revocation of the patent is pending before a court, the patentee must apply to that court under Section 58 for leave to amend the complete specification. The court can allow the amendment on terms as to costs, advertisement or otherwise, and the Controller has a right to appear and be heard. This is one reason to review and repair a specification well before enforcement is contemplated.
Need to fix a claim before someone challenges it?
MYCrave Consultancy drafts Section 57 amendment requests that repair a specification without giving away more scope than necessary.
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