Section 136 of the Patents Act, 1970
Special provisions relating to convention applications
Sets the special requirements for a convention application, including a complete specification and details of the basic application.
Official legal text
The verbatim statutory text of this provision is reproduced from the official source and checked by our legal reviewer before it is published here. Until that check is complete for this page, read the exact wording directly from the official source linked below — it is the only version that governs.
Nothing here replaces the statute. The official wording of the provision, together with any Gazette notification that applies to it, governs. This page only explains that material in ordinary language.
What this section says, in plain language
Section 135 gives the right to claim an earlier foreign date. Section 136 sets the conditions attached to it. A convention application must be accompanied by a complete specification. This is a real difference from the ordinary domestic route, where an applicant may begin with a provisional specification and follow it with a complete one. A convention applicant has already had twelve months to develop the invention after the first foreign filing, so the Act expects the full document at the outset.
The application must also identify what it is based on. The applicant states that the application is a convention application and gives the particulars of the basic application: the convention country in which it was made and the date on which it was made. Where several basic applications are relied on, each has to be specified. These details are captured in the application form and are what the Controller and, later, any opponent will test the priority claim against.
Proof follows the claim. The Controller may require a copy of the specification, drawings and documents filed in the convention country, certified by the official head of the patent office of that country, and a verified translation into English where the documents are in another language. Rule 21 deals with the filing of the priority document, and where the document is available to the office through an accessible digital library, the applicant may be able to request retrieval instead of filing paper. The consequences of not complying are dealt with in rule 22, and losing the priority date is the real risk.
The section also restricts post-dating. A convention application cannot be post-dated under section 17 to a date later than the date on which it could have been made under the Act. Post-dating is a useful tool in ordinary cases, but it cannot be used to stretch the convention timetable, because that would let an applicant obtain the benefit of an earlier priority date while filing later than the law allows.
For anyone managing an inbound filing, section 136 turns into a short checklist: complete specification ready, convention country and date of the basic application stated correctly, certified copy and translation arranged, and no assumption that dates can be shifted afterwards.
Why this section matters
Foreign applicants and Indian agents handling inbound convention filings, and anyone auditing the strength of a granted patent's priority claim.
At the time of filing the Indian convention application and during the period allowed for filing priority documents.
Formal conditions that a convention application must satisfy before the priority claim can be relied on.
The priority claim can fail, leaving the claims to be judged from the Indian filing date against everything published in the intervening year.
How it works in practice
A translation arrives late and a priority claim wobbles
Tanaka Seiko, a fictional Japanese maker of precision valves, files its first application in Japan in June. Its Indian agent files a convention application in Chennai the following May with a complete specification, correctly naming Japan and the June date as the basic application. The examiner later asks for the certified copy of the Japanese application and a verified English translation, because the claim of priority is being tested against a Chinese utility model published in September. The agent had assumed the translation could be filed whenever convenient. Faced with the requirement, the team commissions a certified translation urgently and files it with a request for the time allowed under the rules. The priority claim survives, but only because the requirement was addressed the moment it was raised. Had the translation not been furnished, the June date would have been at risk and the September publication would have been squarely citable against the valve claims, which is exactly the outcome the whole filing strategy was designed to avoid.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- A convention application must be accompanied by a complete specification; a provisional specification will not do.
- The application must state the convention country and date of the basic application, and of every basic application relied on.
- The Controller may require a certified copy of the basic application and a verified English translation.
- Rule 21 governs filing of the priority document and rule 22 deals with the effect of non-compliance.
- A convention application cannot be post-dated under section 17 beyond the date on which it could lawfully have been made.
- Errors in the stated priority particulars are a standard target in opposition and revocation.
Common mistakes and misunderstandings
- Starting a convention application with a provisional specification. The complete specification has to be there from the beginning.
- Recording the wrong basic application date, for example the date of a later continuation rather than the first filing.
- Treating the priority document as optional paperwork. If it is required and not furnished, the earlier date can be lost.
- Hoping to use post-dating to repair a timing problem in a convention filing, which this section specifically prevents.
Connected provisions
Indian patent law works in two layers. The Act carries the substance and the Rules carry the machinery. Because the layers are amended by different processes and at different times, they are presented in separate blocks instead of being merged into one description.
Forms, deadlines and fees
Forms are not set out in the Act. They are prescribed in the Second Schedule to the Patents Rules and are revised from time to time, so obtain the current version from the official website before filing.
- The certified copy of the basic application, and a verified English translation where required, must be furnished within the period allowed by rule 21; confirm that period in the current rules.
- A convention application cannot be post-dated beyond the last date on which it could lawfully have been filed.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
Any official fee connected with this provision is fixed by the First Schedule to the Patents Rules, not by the provision itself. The amount depends on who the applicant is and on whether the filing is made online or on paper, so no figures are reproduced here. How Indian patent fees work.
Related judgments
Court decisions shape how this provision is applied, but a summary is useful only if it is right. Every case note on this site is read by a legal reviewer before it goes live, and none has been completed for this provision so far. This section will fill in as those reviews finish. How case notes are prepared.
Questions people ask about Section 136
Can I file a provisional specification with a convention application?
No. A convention application has to be accompanied by a complete specification. The reasoning is that the applicant already had twelve months after the first foreign filing to develop the invention and prepare a full document. If your Indian document is not ready, the answer is to prepare it, not to file a provisional, because a provisional filed in this situation does not preserve the convention position you are trying to secure.
What is a basic application in Indian patent practice?
It is the application filed in a convention country from which priority is claimed in India. The Indian convention application must state the convention country and the date of the basic application, and where more than one is relied on, each of them. These particulars are what fix your priority date. They should be checked against the actual foreign filing receipts rather than copied from an internal note, because a wrong date is one of the easiest things for an opponent to attack.
When do I have to file the priority document in India?
The Controller may require a certified copy of the basic application, along with a verified English translation where the original is in another language, and rule 21 sets out how and when this is done. Where the document is accessible to the office through a digital library arrangement, a request to retrieve it may be enough. Since the details have been amended over time, check the current rule. Non-compliance is dealt with in rule 22, and it can cost you the priority date.
Can a convention application be post-dated in India?
Only within limits. Section 17 allows post-dating in appropriate cases, but section 136 makes clear that a convention application cannot be post-dated to a date later than the date on which it could have been made under the Act. In other words, post-dating cannot be used as a way around the convention timetable. If a filing has slipped past the priority period, the honest analysis is to work out what can still be protected from the Indian filing date.
Is your convention filing paperwork actually complete?
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