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Preprints, repositories and accepted manuscripts
A preprint is not really published, is it?
For patent purposes it is. A preprint on a public server is available to the public from the moment it is posted, and that date is the one that counts.
The dates people get wrong
The print issue date is the one researchers quote and almost never the earliest.
The accepted manuscript posted online often precedes it by months.
The preprint frequently precedes that by months again.
And the repository deposit of a thesis can precede everything.
Patent law uses the earliest date on which the public could obtain and read the disclosure. So the strategy has to be built around the preprint, not the journal.
What this means in practice
If you post preprints as a matter of routine, the IP check has to happen before posting - not before journal submission.
And if a preprint is already up, that is the date to work from. Take advice on what was actually enabled by it: preprints frequently omit process parameters and scale-up conditions that could still support claims, and other jurisdictions have grace periods that India does not.
What to actually do
- Treat the preprint, not the journal issue, as the publication date.
- Move the IP check to before posting.
- If a preprint is already up, establish exactly what it enabled.
- Keep the posted version and its timestamp.
Sources & further reading
- The Patents Act, 1970 (consolidated to 1 August 2024) — Official IP India text
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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.