Patent Validity in India: How Long It Lasts and What Ends It Early

A granted patent in India stays valid for 20 years from the date the application was filed, not from the date of grant, as long as renewal fees are paid on time. For a PCT national phase application, the 20 years run from the international filing date. Revocation, lapse for unpaid fees or surrender can end a patent sooner.

Key Takeaways

• Term: 20 years, counted from the filing date. Time spent waiting for examination and grant is part of the 20 years, not added to it.
• Renewal: A granted patent needs periodic renewal fees from the third year onward. Missing them lets the patent cease to have effect.
• Early end: Lapse for non-payment, revocation under Section 64 and voluntary surrender are the main routes to an early end.
• Second chance: A lapsed patent can be restored on application within 18 months of lapse, but only on conditions, and rights during the gap are affected.
• Review: Anyone buying, licensing or inheriting a patent should confirm the filing date, renewal status, recorded ownership and pending proceedings before relying on it.

Patent Validity in India at a Glance

Patent validity is a question that reaches Jaipur's manufacturers, founders and inventors at two points: when they file for the first time, and years later, when a patent they own, license or are about to buy needs to be assessed. This primer covers both, in plain language and in the order the questions usually arise.

How Long Is a Patent Valid in India?

A patent granted in India is valid for 20 years from the date of filing the application. The clock does not wait for the grant. If examination takes several years, those years are already counted. The patent is kept in force only by paying renewal fees on schedule.

The Indian Patent Office states in its published FAQs that the term of every patent granted is 20 years from the date of filing of the application, with a different starting point for PCT national phase applications. The WIPO guide to the Indian system says the same for PCT cases: the term for a PCT international application is 20 years from its filing date under the PCT.

Two consequences follow, and first-time applicants often miss both. The term is fixed, so there is no general route to extend it beyond 20 years in India. And the usable life of a patent is shorter than 20 years, because enforceable rights arise only after grant.

How Is the 20-Year Term Counted?

The 20 years are counted from the filing date of the application, which becomes the date of the patent. A provisional application does not start the 20 years if a complete specification follows it. The term runs from the complete application's filing date. For a PCT national phase entry, it runs from the international filing date.

Consider a hypothetical applicant. A Jaipur company files a provisional application on 10 January 2024, then a complete specification on 8 January 2025. The patent is granted in 2027. The 20 years run from 8 January 2025, so the patent ends on the 20th anniversary of that date in 2045, even though the company has held the grant for far less than 20 years by then.

Now consider a PCT case. If the international filing date is 3 June 2024 and the applicant enters the Indian national phase later, the term is still counted from 3 June 2024. Entering the national phase late does not push the end date out.

Two practical points sit beside the count. First, an application is published, normally 18 months after the earliest priority date, and examination happens only on a request. Second, until grant there is no patent to renew. Our guide to patent filing cost and process in India covers those earlier stages in sequence.

What Renewal Fees Keep an Indian Patent Alive?

A granted patent is kept alive by paying a renewal fee for each year, starting from the third year from the filing date. Nothing is due for the first two years or while an application is only pending. The fee is fixed by the Patents Rules and rises in bands as the patent ages.

Renewal is governed by Section 53 of the Patents Act, 1970, read with Rule 80 of the Patents Rules, 2003. The amounts sit in the First Schedule to the Patents Rules, the table of forms and official fees, which carries separate columns for different categories of applicant. We do not reproduce amounts here, because fee tables are amended and the Schedule on the Patent Office site is the only reliable reference.

From the filing desk, the most common renewal problem is not the amount. It is the date. Renewal dates are counted from the filing date, not the grant date, so a patent granted in year four may already have accrued fees for earlier years. Rule 80 sets how those accrued fees are handled on grant; read the rule text rather than assuming the dates restart.

What Happens If a Renewal Fee Is Not Paid?

If a renewal fee is not paid by its due date, a grace period of up to six months is available on payment of the prescribed extension. If the fee remains unpaid after that, the patent ceases to have effect. Restoration is possible, but only by a separate application within 18 months.

The lapse is not automatic in the sense of being invisible. The Patent Office records it, and the patent then no longer gives its owner any right to stop others. A lapsed patent is, in practice, as open to use as an expired one, at least until restoration.

Restoration is a real remedy and a narrow one. Section 60 lets the patentee or a legal representative apply on Form 15 under Rule 84 within 18 months from the date the patent ceased to have effect.

The applicant must satisfy the Controller that the failure was unintentional and that the application was made without undue delay. Courts have looked at such applications closely, including where an agent's negligence was involved. Third parties who began using the invention during the gap may also be protected.

Our view of how a careful owner should treat this is simple. Do not plan on restoration. Treat the due date as fixed, diarise it well ahead, and confirm payment on the Patent Office record rather than relying on a receipt alone.

What Can End a Patent Before 20 Years?

A patent can end early in four main ways: lapse for unpaid renewal fees, revocation under Section 64, surrender by the owner under Section 63, and revocation linked to non-working after a compulsory licence. Each has different parties, forums and consequences, so a patent should be checked against all four.

Lapse for non-payment

This is the quietest route and the most avoidable. Under Section 53(2), a patent ceases to have effect if the renewal fee is not paid within the prescribed period or any extended period the rules allow. Companies that change address, change patent agents or reorganise often miss the reminders that used to arrive.

Revocation under Section 64

Section 64 allows a granted patent to be revoked on a petition by any person interested or by the Central Government. A defendant in an infringement suit can also seek revocation by counter-claim. Revocation proceedings are now heard by the High Court; the Intellectual Property Appellate Board handled them earlier.

The grounds are listed in the section itself. Examples include that the invention was wrongly obtained from someone else, that it was publicly known or used in India before the priority date, that it is not new or lacks an inventive step, that it falls outside what the Act treats as an invention, that the specification does not sufficiently describe it, or that required information about foreign filings was not disclosed.

A granted patent is not therefore a final word on validity. The grant means the Patent Office was satisfied after examination. It does not stop a later challenger from presenting prior art the examiner never saw. Our article on what can and cannot be patented sets out the exclusions that often feature in these challenges.

Opposition before and after grant

Opposition is related to revocation but is not the same thing. A pre-grant representation under Section 25(1) can be filed before grant, and a post-grant opposition under Section 25(2) within a window after publication of grant.

The official fee schedule lists separate forms for each. Where an opposition succeeds, the patent is refused or revoked, so it is another way validity can fail. For the process, see our guide to filing a patent opposition in India.

Surrender and non-working

An owner can surrender a patent under Section 63, which some companies do when a family of patents is being pruned. Separately, a patent can face revocation under Section 85 if, after a compulsory licence has been granted, the invention is still not worked in India to a reasonable extent. A licence of this kind is rare, but the working obligation is the reason patentees file annual statements of working.

How to Review an Existing Patent Asset

To review an existing patent, confirm six things in order: the filing date and expiry date, the renewal payment record, recorded ownership and assignments, the claims as granted, any pending oppositions or revocation actions, and the statements of working. A failure on any item needs action before the patent is relied on.

The checklist below reflects how an existing asset is usually reviewed at the filing desk, where a Registered Patent Agent with more than ten years in patent searching, filing and prosecution at this practice looks at the same file from the application stage onward. Each line gives the pass mark and the red flag.

1. Filing date and expiry date. Pass: the date on the grant certificate matches the Patent Office record, and you have calculated the 20th anniversary yourself. Red flag: a PCT case where the national-phase date was mistaken for the start of the term.
2. Renewal record. Pass: every fee due to date is shown as paid on the Patent Office record, and the next due date is diarised. Red flag: a gap in payments, a fee paid late, or a status showing the patent has ceased to have effect. Check at once whether the 18-month restoration window is still open.
3. Ownership. Pass: the registered owner is the party you are dealing with, and every assignment or licence is recorded. Red flag: an unrecorded transfer, or a co-applicant who never signed away rights.
4. Claims. Pass: the granted claims actually cover the product or process you care about. Red flag: claims narrowed during prosecution so that the commercial version falls outside them.
5. Proceedings. Pass: no pending opposition, revocation petition or counter-claim. Red flag: any such proceeding, because the patent's value is uncertain until it ends.
6. Working statements. Pass: annual statements of working have been filed for each year since grant. Red flag: missing filings, which carry their own consequences under the Act and should be corrected.

If an item fails, the response differs. A lapsed patent calls for an immediate look at restoration. An unrecorded assignment calls for recordal. A pending challenge calls for a read of the specification against the cited prior art. A buyer who finds several red flags should price them into the deal or step back.

One open point deserves a plain statement. How narrowly a court will read a granted claim, and how readily it will revoke on obviousness, depends on the facts and the forum. No checklist settles that in advance, which is why a validity review is a reading exercise and not a tick-box one.

Patent Validity for Applicants in Jaipur and Rajasthan

An applicant files at the Patent Office whose territorial jurisdiction covers where the applicant resides, has a domicile or place of business, or where the invention originated. The Patent Office's page on jurisdiction for filing explains this rule. Validity itself is national, and a grant is effective across India.

Riva Legal Associates practises intellectual property law from chambers in Jaipur, and matters outside Rajasthan are handled across India in association with local counsel where a court or tribunal appearance is needed. Validity disputes such as revocation are heard in the High Court, so the forum depends on where the proceeding is brought.

Rajasthan applicants may also find that state support affects the cost side of patent maintenance. The Rajasthan State Policy on Intellectual Property Rights 2021-2026 provides for subsidies toward filing and prosecution of patent applications by MSMEs, universities, institutions and individuals from the state. Its terms are time-limited and conditional, so read the current text before assuming any support applies.

Frequently Asked Questions

Does patent validity start on the date of grant?

No. The 20-year term runs from the filing date of the application. Grant only marks the point from which the patentee can enforce rights. Because examination can take years, the period of enforceable protection is usually shorter than 20 years, and renewal fees are still counted from the filing date.

Can a patent be extended beyond 20 years in India?

No general extension is available. The term of every granted patent is 20 years from filing, or from the international filing date for a PCT national phase case. After that the invention enters the public domain, and anyone may use it without permission from the former patentee.

Is an Indian patent valid in other countries?

No. An Indian patent gives rights within India only. Protection elsewhere needs a separate application in each country or region, usually through the Paris Convention or the PCT route. Each foreign patent has its own term, renewal schedule and grounds for revocation under that country's law.

How can I check whether a patent is still in force?

Search the application or patent number on the Patent Office's public search and status pages, which are listed among its e-services. Check the legal status, the renewal fee record and any recorded transfers, and compare the filing date against the 20-year calculation.

The Patents Act, 1970 and the Patents Rules, 2003 are the governing texts for each point above, and the Patent Office's Manual of Patent Office Practice and Procedure sets out how the office applies them. Fee amounts, grace periods and procedures change by amendment, so check them against the current official text for a specific patent.

This content is published for general information only. It is not legal advice, an advertisement, or a solicitation of work, and reading it does not create an advocate-client relationship. In keeping with the Bar Council of India Rules, Riva Legal Associates does not solicit work or advertise.

Readers should obtain independent legal advice on their own facts.