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Patent criticality
Why unity objections arise
The examiner says my application contains more than one invention. What now?
A unity objection is not an attack on your invention. It is the examiner saying that one application cannot cover all of this - and it creates a decision with a deadline attached, because divisionals must be filed before the parent is granted.
What the objection means
An application must relate to a single invention or a group of inventions linked so as to form a single inventive concept. Where the examiner finds no common special technical feature, the application is treated as containing several inventions.
The applicant elects which to pursue in the parent, and may file divisional applications for the rest - each keeping the original date for subject matter disclosed in the parent.
The deadline nobody diaries
A divisional can be filed at any time before the grant of the parent. Once the parent is granted, that door closes. Applicants who leave the decision until the grant letter arrives discover that they have lost the other inventions entirely.
Since 2024, rule 13(2A) expressly allows a further application to be filed in respect of an invention disclosed in an earlier further application - so a divisional of a divisional is available.
Sections 10(5) and 16 of the Patents Act 1970; rule 13(2A) of the Patents Rules 2003 as inserted in 2024.
The Delhi High Court held in 2023 that the plurality of inventions justifying a divisional is tested on the disclosure in the provisional or complete specification, and need not appear in the parent claims.
Decide the divisional question when you receive the objection, not when the parent is allowed.
Assuming a divisional can be filed after grant. It cannot.
Notices of allowance - they are also the last call for divisionals.
For any application with a unity objection, write down which subject matter you are giving up if no divisional is filed.
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
- The Patents (Amendment) Rules, 2024 - G.S.R. 211(E), 15 March 2024 — Gazette text via WIPO Lex
- Syngenta Limited v Controller of Patents and Designs, Delhi High Court (Division Bench), 13 October 2023, 2023:DHC:7473
Related
Unity of invention
The requirement that a single application relate to one invention, or to a group of inventions linked so as to form a single inventive concept.
Divisional application
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The divisional you could no longer file
A divisional application must be filed before the parent is granted. That is a moving target you do not control - and it is the single most common way that valuable …
The case that reopened divisional applications
Holding an examination report?
A reply is an argument, not a form. What you concede now shapes what your patent is worth later.
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.