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Patent criticality
What you said to the examiner is a public document
Can my own patent office arguments be used against me?
Every argument, amendment and concession made to get a patent granted sits on a public file that anyone can inspect. It is the first thing an opponent's counsel reads, and it frequently supplies their best point.
How it is used
If you distinguished the cited art by saying that the invention requires a particular feature, or that a term has a particular narrow meaning, you have made a public statement about scope. A defendant who does not have that feature will put it in front of the court.
The same applies to arguments about what the skilled person knew, what the technical problem was, and what your invention does not cover. All of it is on the record.
The discipline it demands
Write replies as though a judge will read them, because one might. Concede the minimum. Where possible, overcome an objection by argument rather than by amendment, and by amendment rather than by characterising the invention narrowly.
And keep the file consistent across countries. Statements made to one office about the same family can and do surface elsewhere.
Section 153 of the Patents Act 1970 and rule 27 of the Patents Rules 2003: documents are open to public inspection after publication.
Before filing any reply, ask what a competitor would quote from it.
Writing FER replies as internal correspondence.
Sentences that characterise the invention as essentially or fundamentally something.
Read the prosecution history of your most valuable patent and list every sentence a defendant would enjoy quoting.
Sources & further reading
- The Patents Act, 1970 (consolidated to 1 August 2024) — Official IP India text
- The Patents Rules, 2003, as amended (e-version updated to 15 March 2024) — Official IP India text
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Educational guidance, not legal advice. This material is published by Ragulika IP for general education and information. It is not legal advice, it does not create a professional-client relationship, and it is not a substitute for advice on your own facts. Patentability, infringement, prosecution strategy and every other IP outcome turn on the specific facts and on the law and Patent Office practice as they stand at the time you act. Please take professional advice before making a decision, and read the underlying provision or judgment before relying on any point stated here.
Last reviewed by Ragulika IP on 2026-08-23. Indian patent law and Patent Office practice change; check the position before you rely on it.