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Patent criticality
The twelve months that decide your international position
When do I have to decide about filing abroad?
Twelve months from your first filing, you must either file in each country you care about, or file a PCT application that preserves the option. There is no third choice, and the deadline is effectively immovable.
What the twelve months buys and what it costs
Filing directly in five countries at twelve months is expensive and forces the decision early. Filing a PCT application instead costs far less at that point and pushes the country-by-country decision out to roughly thirty or thirty-one months from priority - by which time you usually know far more about the market, the technology and the prior art.
What the PCT does not do is grant anything. It buys time and an international search report; every patent is still granted nationally.
The second deadline that ends more cases than the first
Indian national phase entry is at thirty-one months from the priority date, and Indian practice and recent authority treat that as mandatory. Whether the general extension power introduced in 2024 reaches it is not settled - so plan on the basis that it does not.
Sections 133 to 135 of the Patents Act 1970; rules 19 to 23 of the Patents Rules 2003; rule 20(4)(i) for national phase entry into India.
Decide the market list before month nine, not month twelve. The last three months should be for executing, not deciding.
Treating a PCT filing as protection. It is an option, not a right.
Priority dates on provisionals filed by a previous adviser and never re-docketed.
Write your priority date on one line and add twelve months and thirty-one months underneath it. Those two dates are your international strategy.
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
Related
PCT
A treaty procedure that lets you file one international application that has the effect of a filing in every contracting state, and then decide later which countries…
National phase
The stage at which a PCT application is taken into an individual country's system. In India the time limit is thirty-one months from the priority date.
Convention application
An application filed in India claiming priority from an application filed earlier in a convention country, within twelve months of that earlier filing.
The thirty-one months that ended the case
If a PCT application does not enter the Indian national phase within thirty-one months of the priority date, it is treated as withdrawn so far as India is concerned.…
Before filing outside India
The twelve-month priority window is effectively immovable, and section 39 catches Indian residents in a way most people never hear about.
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.