What is the Section 8 disclosure requirement for foreign patent filings

Question

I have filed a patent application in India and also filed for the same invention abroad, and I heard I need to disclose this to the Indian Patent Office. I have been reading conflicting things online and I would like to understand what Indian law actually says about this, which Act and Section applies, what the realistic timelines and costs are, and what I should be doing right now to protect my position. If the matter can be resolved without litigation I would prefer that route, but I want to know what my rights are before I agree to anything or sign any document.

MyVakeel Legal Desk · Accepted Answer

What is the Section 8 disclosure requirement for foreign patent filings is governed in India primarily by Patents Act, 1970, Section 8 and Patents Rules, 2003, Rule 12. The short answer is set out below, followed by the practical steps most people in this situation need to take. Read it alongside the specific provisions named, because the exact relief available to you turns on the facts you can prove on paper.

Section 8(1) of the Patents Act, 1970 requires an applicant who has filed or is filing an application for the same or substantially the same invention in any country outside India, to file with the Indian Patent Office a statement setting out details of such foreign applications, along with an undertaking to keep the office informed of subsequent developments, in the prescribed form (Form 3).

Rule 12 of the Patents Rules, 2003 requires the statement under Section 8(1) to be filed within six months of filing the Indian application, or within six months of filing any subsequent foreign application, and the applicant must continue to update the office of the status of these foreign applications until grant or refusal of the Indian patent.

Failure to comply with Section 8 has historically been treated by Indian courts as a ground for revocation of the patent under Section 64(1)(m), even after grant, and several Indian patents have been revoked or challenged specifically for suppression or non-disclosure of corresponding foreign filings and their prosecution history.

Recent judicial trend requires that non-disclosure be material and wilful for revocation to follow, rather than a purely technical lapse, but applicants are still well advised to track all corresponding foreign filings meticulously and file updates through Form 3 whenever there is a status change abroad.

What to do next: 1) List every corresponding foreign patent application for the same invention; 2) File Form 3 within six months of the Indian filing or the foreign filing, whichever is later; 3) Update the Patent Office periodically as foreign prosecution status changes; 4) Maintain records of all Section 8 filings to defend against a future revocation claim.

If the other side has already issued a notice, filed a case or set a deadline, treat the matter as time-sensitive — most remedies under Patents Act, 1970, Section 8 carry limitation periods, and a delay you cannot explain weakens an otherwise strong case. You can post the details on the MyVakeel forum for a practising advocate to review, or book a paid consultation with a Bar Council verified lawyer in this practice area.