Section 53 of the Patents Act, 1970
Term of patent
Section 53 fixes the life of an Indian patent at twenty years from the filing date, subject to paying renewal fees.
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.
Treat this page as a guide. The provision as officially published, along with the Gazette notifications that apply to it, remains the governing text and overrides any simplification here.
What this section says, in plain language
A patent is a time-limited right. Section 53 sets the limit at twenty years from the date of filing of the application for the patent. The clock does not start at grant, and it does not restart when the patent finally issues. If an application takes five years to reach grant, the patentee has roughly fifteen years of enforceable life left. India does not have any patent term extension mechanism to compensate for regulatory or examination delay, so the twenty-year period is firm.
For an international application filed under the Patent Cooperation Treaty and later entered into India, the twenty years run from the international filing date, not from the date the national phase was entered. Applicants sometimes mistake the national phase entry for the start of the term, which leads to badly wrong commercial forecasts.
The term is conditional on renewal fees. Fees to keep the patent in force become payable from the third year onwards, and each year's fee must be paid before the expiry of the corresponding year of the patent. Where a patent is granted after the second year has already passed, the accumulated renewal fees can be paid within the period the Rules allow after the date of recording in the register. Rule 80 governs the mechanics, including payment of several years in advance, and the First Schedule prescribes the amounts.
If a renewal fee is not paid in time, an extension of up to six months can be requested on payment of the prescribed extension fee. Miss that as well and the patent ceases to have effect. It does not vanish forever at once: Section 60 allows an application for restoration within eighteen months from the date the patent ceased to have effect, and Sections 61 and 62 govern that process and the rights of third parties who acted in the meantime.
When the term ends, the invention as claimed falls into the public domain and anyone may work it. That is the bargain behind the patent system: full disclosure in the specification in exchange for a fixed period of exclusivity. Businesses on both sides plan around it, patentees by building follow-on protection and brand strength before expiry, and competitors by preparing to enter the moment the term runs out.
Why this section matters
Every patentee and applicant, licensees paying royalties, investors valuing a portfolio, and competitors planning market entry after expiry.
From filing, because that is when the term starts, and every single year once renewal fees become payable.
A fixed maximum life for the patent and a continuing obligation to pay renewal fees to keep it alive.
A missed renewal fee can end a valuable patent, and a licensee may keep paying royalties on a patent that has already lapsed or expired.
How it works in practice
Counting the term from the right date
Suryagrid Energy Pvt Ltd files a complete specification for a solar inverter control method in March 2016 and the patent is granted in August 2021. The founders tell an investor the patent runs to 2041, twenty years from grant. It does not. The term runs twenty years from the March 2016 filing date, so it ends in March 2036, and about five of those years were consumed before grant. The company also enters India in 2018 through a PCT application with a 2017 international filing date for a related invention; that term runs from 2017, not from the national phase entry. Meanwhile the finance team, focused on the grant, overlooks that renewal fees on the first patent had been accruing from the third year of the patent. They pay within the six-month extension window on a request under Rule 80 with the prescribed fee, and the patent survives. Had they missed that too, the patent would have ceased and restoration under Section 60 would have been the only route.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- The term is twenty years from the date of filing of the application, not from grant.
- For a PCT national phase application the term runs from the international filing date.
- Renewal fees are payable from the third year and each year thereafter to keep the patent in force.
- An extension of up to six months for paying a renewal fee can be requested with the prescribed fee.
- A patent that ceases for non-payment may be restored under Section 60 within eighteen months.
- India has no patent term extension for regulatory or examination delay.
- On expiry the claimed invention is free for anyone to use.
Common mistakes and misunderstandings
- Counting twenty years from the date of grant. The term is measured from the filing date, so grant delay shortens usable life.
- Treating the national phase entry date as the start of the term for a PCT-based Indian patent.
- Assuming renewal fees begin only after grant. They accrue by reference to the years of the patent, and arrears are settled when the patent is recorded.
- Relying on the six-month extension as a routine buffer. It costs more and leaves no margin if anything goes wrong.
- Forgetting to pay renewal fees on a patent of addition after it has been made an independent patent under Section 55.
Connected provisions
A section tells you what the law is. A rule tells you how the Patent Office runs it from day to day. The two are kept apart here so that a reader can quote the section accurately and then look up the current rule for the practical steps.
Forms, deadlines and fees
Any form mentioned here is prescribed by the Second Schedule. Amendments to the Rules often bring new versions of forms with them, so use the version currently published by the Patent Office, not a template from a book or an old file.
- The patent term is twenty years from the date of filing of the application, or from the international filing date for a PCT national phase application.
- Renewal fees become payable from the third year of the patent and must be paid before the expiry of the corresponding year.
- An extension of up to six months to pay a renewal fee may be requested with the prescribed extension fee.
- If the patent ceases, an application for restoration must be made within eighteen months from the date it ceased to have effect.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
We do not publish fee amounts. The First Schedule sets them, and they differ by category of applicant, such as a natural person, a startup, a small entity or another applicant, and by the mode of filing. Check the Schedule currently in force before you calculate anything. How Indian patent fees work.
Amendment history
What changed in this provision, newest first. Read the footnotes in the official consolidated text for the full record.
- 2005The Patents (Amendment) Act, 2005An explanation was added for applications entering India through the international route, the wording on extension was changed and one sub-section was dropped.
- 2002The Patents (Amendment) Act, 2002A single term of 20 years from the date of filing was set for every patent, replacing the shorter terms that used to apply, including the special shorter terms for food, medicine and drug process patents.
Compiled from official consolidated texts and Gazette notifications. See the site-wide change log.
Related judgments
No judgment summaries appear here yet. Our process requires a legal review of each case note before publication, covering the citation, the court and the point actually decided. Until a note for this provision has passed that check, the section stays empty rather than carrying unverified material. How case notes are prepared.
Questions people ask about Section 53
How long does an Indian patent last?
Twenty years from the date of filing of the application. The period is not counted from the date of grant, so any time spent in examination and prosecution is taken out of the useful life of the patent. For an application entering India through the Patent Cooperation Treaty, the twenty years run from the international filing date. There is no extension of the term in India for delays in examination or in obtaining regulatory approval, which is different from the position in some other countries.
When do I have to pay patent renewal fees in India?
Renewal fees are payable from the third year of the patent, and the fee for each year must be paid before that year of the patent expires. Where the patent is granted after the second year has passed, the accumulated fees are payable within the period allowed after the patent is recorded in the register. If you miss a due date, you can request an extension of up to six months with the prescribed extension fee. The amounts are set out in the First Schedule; see the fees page for details.
What happens if I miss a renewal fee?
If the fee is not paid within the due period and no extension is obtained, the patent ceases to have effect from that point. Third parties are then free to work the invention. The patentee may apply under Section 60 for restoration within eighteen months from the date the patent ceased, showing that the failure to pay was unintentional and that there has been no undue delay. Even if restoration is granted, Section 62 protects people who started using the invention in good faith in the intervening period.
Can the twenty-year term be extended in India?
No. Indian law does not provide for supplementary protection certificates, patent term adjustment for office delay, or extension for time lost to drug regulatory approval. What can be managed is the start of the clock and the speed of grant. Filing strategy, use of the provisional application, and requesting expedited examination under Rule 24C where a category applies are the practical levers. After expiry, protection has to come from other sources such as trade marks, later improvement patents or trade secrets in know-how.
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