IP Intelligence › Patent Criticalities › The danger of filing too late
Patent criticality
The danger of filing too late
How late is too late?
Late filings fail in three different ways, and only one of them is about competitors. Your own disclosure becomes prior art against you. Somebody else files first. And the twelve-month window for taking your date abroad quietly closes.
The three failures
Your own disclosure. India has no general grace period. A demonstration, paper, sale or launch before your priority date is prior art against your own application.
Someone else. India operates on a first-to-file basis. Two people can genuinely invent the same thing independently, and the one who filed first prevails. Being able to prove you invented it earlier does not help.
The convention window. Twelve months from your first filing to file abroad or to file a PCT application claiming that priority. Miss it and every foreign filing starts fresh - by which time your own Indian application has probably published.
What lateness usually looks like
Not carelessness. Waiting for funding. Waiting for the design to settle. Waiting until after the trade show, so as not to distract the team. Waiting for a co-founder to come back from leave. Each is understandable and each has the same effect.
Sections 11A, 29 to 32 and 135 of the Patents Act 1970; the twelve-month Paris Convention period.
If a public event is coming, file something adequate before it. A well-drafted provisional filed on Monday beats a perfect complete specification filed the following month.
Assuming an NDA at the event solves it. It helps only if it actually binds every attendee.
Conference dates, demo days, investor pitches, tender submissions and product pages going live.
Put your next public event in a calendar and work backwards. The filing has to be before it, not near it.
Sources & further reading
- The Patents Act, 1970 (consolidated to 1 August 2024) — Official IP India text
Related
You told the world before you told the Patent Office
In India there is no general grace period. If your invention was made available to the public before your priority date, that disclosure is prior art against your ow…
The twelve months that decide your international position
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 cho…
The startup that filed too late
What could have gone wrong, and how much of it is recoverable?
I have an invention. Where do I start?
Four questions that decide what you should do this month.
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.