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Real-life scenario · fictionalised
The divisional that came too late
An application describes a new catalyst, a process for making it, and a reactor configuration that uses it. Only the catalyst is claimed. The examiner raises no unity objection because only one invention is claimed. The application is allowed and granted in March. In August the company decides to protect the reactor configuration, which a competitor has started selling.
Can a divisional still be filed?
The window closed at grant
Section 16 permits a further application at any time before the grant of the parent. Once the parent was granted in March, the option was gone.
The reactor configuration was described in the specification but never claimed. Since 2023 Indian authority has been clear that a divisional can be based on subject matter disclosed in the specification even where it was never claimed - which means that until March a divisional was available. Nobody asked.
What is left
A fresh application is not a solution: the parent published years earlier and its description of the reactor configuration is now prior art against exactly that subject matter.
A patent of addition is not available either, because it must relate to an improvement on a patent already held and this was disclosed in the same original document.
The realistic answer is that the reactor configuration is in the public domain, given away by the company's own specification.
What should have happened
- Reviewed divisional options at the examination report stage, not at allowance.
- Kept an inventory of what each specification discloses but does not claim.
- Treated an allowance notice as the last call for divisionals, with a standing checklist item.
- Filed the divisional early - it could always be abandoned later if the commercial case faded.
Everything you describe and do not claim is a gift to the public, unless you divide it out before grant.
This scenario is a composite teaching example written by Ragulika IP. It does not describe any real client, application or matter, and any resemblance to a specific case is coincidental.
Sources & further reading
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The case that reopened divisional applications
A divisional can be filed whenever I want.
A divisional must be filed before the parent is granted. Once the parent is granted, the option is gone.
Not sure whether this applies to your invention?
The honest answer usually needs someone to look at your actual disclosure, your timeline and the prior art. That is a conversation, not an article.
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.