Section 141 of the Patents Act, 1970
Determination of certain contracts
Lets either party end a patent licence or related contract on three months notice once the patent behind it ceases to have effect.
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.
This is a simplified explanation. Where it differs from the official text of the provision, or from an applicable Gazette notification, the official text and the notification prevail.
What this section says, in plain language
Licences often outlive the patents they were built on. A contract may run for a fixed term, or until terminated by mutual agreement, while the patent that gave it value expires, lapses or is revoked. Section 141 addresses that mismatch. Where a patent ceases to have effect, any contract relating to the lease of, or a licence to work, the patented article or the patented process may be ended by either party on three months notice in writing to the other, whatever the contract itself says.
The right belongs to both sides. A licensee stuck paying royalties for a monopoly that no longer exists can walk away, and a licensor who no longer wishes to service an arrangement that has lost its statutory basis can do the same. Where the contract rests on more than one patent, the right arises when all of the patents concerned have ceased to have effect, so a licence supported by a surviving patent is not undone simply because one member of the family has gone.
The section does not wipe out the contract or unwind the past. It supplies a route to termination for the future. Sums already earned, confidential information obligations and any independent commercial arrangements are matters for the contract and for general law. It is also without prejudice to any other right of termination the parties have, so a contractual termination clause remains available if it is more convenient.
The reason the provision exists is straightforward. A patent is a limited monopoly. Once it ends, the invention belongs to the public, and continuing to collect royalties for the use of public property would extend the monopoly by contract. Section 141 stops a party from being locked into that position by drafting.
The drafting lesson for Indian agreements is to plan for the end at the beginning. List the patents relied on, allocate royalties between them, provide for a step down when a patent expires or is revoked, and separate payments for know how, trade marks and support from payments for the patent, since those may rest on different foundations.
Why this section matters
Licensees and licensors under Indian patent licences, lessees of patented equipment, and lawyers drafting technology transfer agreements.
When a patent expires at the end of its term, lapses for non-payment of renewal fees, is surrendered or is revoked.
A statutory right for either party to terminate on three months written notice, notwithstanding contrary terms in the contract.
A licensee may keep paying royalties for an expired patent, or a licensor may assume a long term contract survives the patent that supported it.
How it works in practice
Royalties after a patent lapses in a machinery licence
Vaigai Engineering, a Madurai pump manufacturer, took a ten year licence to work a patented impeller design, paying a running royalty on sales. In year six the patentee fails to pay a renewal fee and the patent lapses. Vaigai continues paying for two quarters before its finance head notices that the register no longer shows the patent in force. Vaigai's adviser explains that once the patent has ceased to have effect either party may end the contract on three months written notice, whatever the ten year term says. Vaigai serves notice, and uses the notice period to negotiate. The licensor offers a reduced fee covering ongoing technical support and access to updated drawings, which is genuine value unconnected with the lapsed patent, and the parties sign a fresh services agreement. Vaigai stops paying patent royalties, keeps the support it actually uses, and adds a clause to all future licences requiring the licensor to notify it immediately if any listed patent lapses or is revoked.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- When the patent ceases to have effect, either party may end the contract on three months written notice.
- The right applies even if the contract says it runs for a longer fixed term.
- Where several patents support the contract, the right arises once all of them have ceased to have effect.
- It applies to leases of patented articles and licences to work a patented article or process.
- Other rights of termination under the contract or general law are unaffected.
- Obligations unconnected with the patent, such as know how or support, are governed by the contract.
Common mistakes and misunderstandings
- Assuming royalties automatically stop the day a patent expires. The contract continues until it is ended, and notice has to be given.
- Ending the contract without written notice. The section works through a three months notice in writing, not through silence or a stopped payment.
- Overlooking that a contract may be supported by several patents, so one expiry may not be enough.
- Treating the entire agreement as dead when only the patent related part needs to end, which can lose valuable know how or support terms.
Connected provisions
A section of the Act states what the law requires. The detail of complying with it, including forms, periods and office procedure, sits in the Patents Rules, 2003. The Rules are a separate instrument and change far more often, so they are shown alongside rather than folded into the section.
Forms, deadlines and fees
- Termination under section 141 takes effect after three months written notice given to the other party once the patent has ceased to have effect.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
This site does not carry a fee table. The First Schedule to the Patents Rules is the source, the rates vary with the applicant's category and with the mode of filing, and a figure quoted second-hand goes out of date quietly. 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 141
Do I have to keep paying royalties after an Indian patent expires?
Not once you have exercised the right under section 141. When the patent ceases to have effect, either party may end the contract, or the part of it relating to that patent, by giving three months notice in writing, whatever the agreed term says. The contract does not simply vanish on expiry, so payments can continue until notice is given and takes effect. Check the register to confirm the patent's status, then serve notice promptly.
What does ceases to have effect mean for a patent?
It covers the situations where the patent no longer stands: the twenty year term has run out under section 53, the patent has lapsed because renewal fees were not paid, it has been surrendered, or it has been revoked. Each of these ends the monopoly. The practical step is to verify the position from the register of patents rather than relying on the other party, because a lapsed patent can sometimes be restored and the position may change.
Can a contract override the three months notice right?
No. The right operates notwithstanding anything to the contrary in the contract, which is exactly why it exists. A patentee cannot lock a licensee into paying for a monopoly that has ended by drafting a longer fixed term. What the contract can usefully do is deal with the consequences sensibly, for example by separating patent royalties from payments for know how or support, so that the parties know what survives when the patent goes.
My licence covers five patents and only one has expired. Can I terminate?
Generally no. Where a contract is supported by several patents, the statutory right to end it arises when all of the patents concerned have ceased to have effect. Until then the arrangement still rests on live rights. This is a strong argument for drafting royalty terms patent by patent, with a step down as each one expires, so that the commercial position adjusts gradually instead of turning on a single all or nothing termination right.
Still paying royalties on a patent that has ended?
MYCrave Consultancy reviews your licence, verifies patent status and prepares the notice needed to end payments properly.
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