Extension of Time in Indian Patents: Form 4 and Rule 138

Explainer · Patent Deadlines

Updated for 2026 · Claw Editorial

You are staring at a patent deadline you may miss: a reply to an examination report, a hearing response, a Form 3 update, a working statement. The question is simple. Can the deadline be extended, by how much, and what is the cost? In India the answer sits in Rule 138 of the Patents Rules, 2003, and the tool is Form 4. Since the 2024 amendment, the Controller can extend a rule-based time limit by up to six months. But some deadlines can never be extended this way, and missing those can end the application. This page was last verified in October 2026.

01The short answer

Under Rule 138 of the Patents Rules, 2003, the Controller can extend the time for doing an act under the Rules, or condone a delay, for up to six months. You ask for it on Form 4, and you must ask before the six-month period runs out. You can file more than once inside that window.

Rule 138 gives up to six months on Form 4. Rule 137 and the Patents Act itself mark the deadlines it cannot touch.

Three points matter most.

• It covers Rules, not the Act. A time limit written in the Patents Act is not extended by Rule 138.
• It costs money, month by month. The fee depends on the type of applicant. See the cost section.
• It is not automatic. You must give reasons. The Controller decides.

02What Rule 138 allows

Before the 2024 amendment, Rule 138 allowed a short extension, generally one month, and it carried a list of rules it did not apply to. The Patents (Amendment) Rules, 2024 changed this. The Controller can now extend time or condone delay for up to six months, and the older list of carve-outs in Rule 138 was removed.

Which deadlines it can cover

Rule 138 applies to time limits set by the Rules. Law-firm notes on the amendment list examples such as:

• Updating foreign filing details on Form 3 (Rule 12).
• Fixing specification and drawing defects (Rules 13 and 15).
• Replying to the examination report (Rules 24B and 24C).
• Filing the statement of working (Rule 131).

IP India’s e-filing portal shows which actions accept a Form 4 request. Check the portal list for your exact action before you rely on any article, including this one.

Extension and condonation are different

An extension is asked for before the deadline passes. Condonation is asked for after you have already missed it. Rule 138 covers both, but the six-month limit counts from the original deadline, so late filers have less room than they think.

03How to file Form 4

Form 4 is the request for extension of time or condonation of delay. The practical steps are these.

1. Identify the exact deadline. Note the rule or section that sets it and the date it expires.
2. Check that Rule 138 applies. Confirm it is a Rules deadline and not an Act deadline or an excluded one.
3. Write the reasons. State why more time is needed, with documents if you have them. Vague reasons invite refusal.
4. File Form 4 before the deadline if you can. Do it through the IP India e-filing system with the fee for the months you need.
5. Prepare the real filing in parallel. If the Controller grants time, file the reply, the form or the response straight away.
6. Diarise the new date. An extension is granted to a stated date. Do not assume the full six months.

Because you may file more than once within the six months, some applicants ask for a short period first and extend again if needed. Each request needs its own reasons and fee, so plan the total cost.

04What it costs

The official fee is charged per month of extension or condonation. Law-firm commentary on the 2024 amendment reports these amounts:

The totals are simple multiplication of the reported monthly fee. Fees can change and professional fees are extra. Confirm the amount in the fee schedule on ipindia.gov.in before you file.

05What cannot be extended

This is the part that causes real damage. Some time limits are outside Form 4 relief.

1. Deadlines written in the Patents Act

Rule 138 is a rule. It cannot stretch a period fixed by a section of the Act. Examples that practitioners treat as fixed include the 12 month priority period for filing in India, and the statutory periods for opposition and for appeals. Do not file Form 4 and assume you are safe. Treat Act deadlines as hard.

2. The Rule 137 exclusions

Rule 137 sits beside Rule 138 and deals with other procedural matters and certain periods that are not open to the normal extension. Commentary lists items such as patent renewal fees, updates of foreign filing details in some cases, priority document translations, and review petitions as outside the usual extension. Sources do not fully agree on the exact list, so read the rule itself.

3. Deadlines with their own late route

Renewal fees, for example, have their own mechanism for late payment. If a patent has already lapsed, the route is not Form 4 but restoration. See our guide on patent restoration under Section 60.

4. National phase entry

Commentary says the 31 month national phase deadline is now treated as extendable under the amended Rule 138, but that relief is uncertain in practice and depends on the facts.

06Common mistakes

• Waiting until the last day. A late request leaves no room for a refusal or a query from the office.
• Using Form 4 on an Act deadline. The fee is paid and the deadline still lapses.
• Assuming six months are granted. The Controller can grant less. Diarise the date actually given.
• Weak reasons. Write facts and attach proof. “Need more time” is not a reason.
• Not budgeting the fee. Repeated monthly fees add up quickly for large entities.
• Relying on one source. Rules are amended. Check the current text on IP India.

07Tracking deadlines so you rarely need Form 4

Form 4 is a rescue. The better habit is a clean deadline system: one calendar for every action date, a second reminder well before the date, and a clear owner for each filing. Firms with large portfolios often use dedicated docketing software for this. If you are comparing registry and compliance tools, see our guide to Niyam alternatives.

The same discipline applies across IP. For a different kind of deadline problem, in a copyright prosecution, see copyright criminal remedies under Section 63.

08Where Claw fits

Claw is an all-in-one legaltech platform for Indian advocates, law firms, and corporate legal teams, combining AI-based case search, an AI legal assistant (Legal GPT), case management, and compliance automation across all Indian courts and tribunals.

Form 4 saves a missed registry date; a disputed patent still has to be fought in court. Claw tracks cases, orders and hearings across 9,102 courts, benches and forums, with 30 crore+ judgments, Supreme Court records from 1950 and High Courts from 1990, and results in under 5 seconds, so you can see how courts have treated delay and condonation arguments, or follow a live patent matter by party or advocate. Claw does not use customer documents to train AI models.

Create a FREE Claw account to research patent orders and track a live matter. To search the wider body of law, see case search across Indian courts.

09Sources and further reading

Check every rule and fee against the primary source before you file. Last verified October 2026.

• Office of the Controller General of Patents (IP India): ipindia.gov.in
• IP India e-filing services: ipindiaservices.gov.in
• The Patents Act, 1970 (India Code): indiacode.nic.in
• Law-firm commentary used for the 2024 changes: Kan and Krishme, Abhijit Bhand
• Claw: clawlaw.in

This page is general information, not legal advice. Rules and fees can change.

10Frequently asked questions