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Patent criticality
The same thing has three different names
Does it matter if I call it a housing in one place and a casing in another?
It matters more than it seems. If the description calls something a housing, a casing and an enclosure, an examiner has to decide whether those are one thing or three - and so, later, does a court.
How the problem is created
Usually by drafting in sessions, or by merging an inventor disclosure with a drafter's text, or by translating. Nobody intends it, and it survives because it reads naturally.
The consequence is real. Support for a claim term is judged by what the description says about that term. If the claim says enclosure and the description only ever explains the housing, the link has to be argued rather than read.
The cheap fix
Build a term list before drafting: one name per component, one name per step, with the alternatives listed once as synonyms in a definitions paragraph. Then search the finished draft for each alternative to make sure it does not appear anywhere else.
Sections 10(4) and 10(5) of the Patents Act 1970.
One concept, one word - and say once, explicitly, what other words mean the same thing.
Varying vocabulary to make the text read better. Patents are not prose.
Drawings labelled with terms that do not appear in the claims.
Run a find on each claim term across your specification and count the hits. Any term with fewer than two or three is under-supported.
Sources & further reading
- The Patents Act, 1970 (consolidated to 1 August 2024) — Official IP India text
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Support
The requirement that every claim be fairly based on the matter disclosed in the specification - that what you claim is what you described, no wider.
Thinking about filing?
Before anything is drafted, the useful work is establishing what is already public, what is genuinely yours, and what you can honestly claim.
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.