Section 50 of the Patents Act, 1970
Rights of co-owners of patents
Section 50 sets the default rules for jointly owned patents: equal shares, each co-owner may work alone, but licensing needs everyone's consent.
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This explanation is written for clarity, not for citation. The official statutory text and any Gazette notification in force on your date govern, and they prevail over anything said here.
What this section says, in plain language
Patents are often owned by more than one person. Two founders, a company and a research institute, or several inventors named together can all end up as joint patentees. Section 50 supplies the default rules for that relationship, and those defaults apply unless there is an agreement saying something different. Getting the agreement in place early is far easier than arguing about the defaults later.
The first default is share. Each of the persons named as grantee or proprietor is entitled to an equal undivided share in the patent. Undivided means no co-owner owns a particular claim or a particular territory; each owns a fraction of the whole. This holds even where one co-owner did most of the inventive work or funded all of the filing, unless the parties have agreed otherwise in writing.
The second default is the freedom to work. Each co-owner may, by himself or through his agents, make, use, exercise and sell the patented invention for his own benefit, without having to account to the other co-owners for the profits. This surprises many first-time joint owners. It means a co-owner can build a business on the patent and keep the money, while the other co-owner does nothing and receives nothing.
The third default is the restriction that balances the second. A co-owner cannot grant a licence under the patent, and cannot assign a share in it, without the consent of all the other co-owners. So one co-owner may exploit the invention personally, but cannot bring in a third party to do so, and cannot sell out to a third party, without agreement. Where a patented article is lawfully sold by one co-owner, the buyer gets the same rights as if the seller had been the sole owner.
Section 50 also leaves other legal relationships untouched. It does not affect the mutual rights and obligations of trustees or of the legal representatives of a deceased person, and it applies subject to any contract to the contrary. Where the co-owners deadlock, Section 51 allows the Controller to be approached for directions.
Why this section matters
Co-founders, academic and industry collaborators, joint venture partners, families inheriting a patent, and anyone negotiating with only one of several co-owners.
From the moment more than one name appears as applicant or patentee, and especially when a licensing or sale opportunity arrives.
Equal undivided shares, an individual right to work the invention without accounting, and a collective veto over licensing and assignment.
One co-owner can commercialise the invention and keep every rupee, while a promising licensing deal collapses because a single co-owner refuses to sign.
How it works in practice
Two founders, one licensing offer
Ananya Rao and Faisal Sheikh jointly own an Indian patent on a water-saving drip irrigation coupler. They never signed a co-ownership agreement. Ananya sets up a small unit near Nashik and starts manufacturing and selling the coupler. Faisal objects and asks for half the profits. Under the default rule in Section 50, Ananya is entitled to make, use and sell the invention for her own benefit without accounting to Faisal, so his demand fails. A year later a Coimbatore pump manufacturer offers a licence with a healthy royalty. This time Ananya cannot sign alone: granting a licence requires Faisal's consent, and he refuses because he is still aggrieved. The patent stays under-exploited. Both problems would have been avoided by a short co-ownership agreement at filing stage setting out shares, profit sharing and who may licence. Where the deadlock persists, Section 51 lets either of them ask the Controller for directions.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- Joint patentees hold equal undivided shares unless an agreement says otherwise.
- Each co-owner may work and sell the invention alone and keep the profits.
- No co-owner may grant a licence or assign a share without the consent of all the others.
- A buyer of a patented article sold by one co-owner gets full rights in that article.
- The section applies subject to any contract between the co-owners, so a written agreement overrides the defaults.
- Section 51 provides a route to the Controller when co-owners cannot agree.
Common mistakes and misunderstandings
- Assuming joint ownership means profits are shared. Without an agreement, a working co-owner keeps what he earns.
- Believing a majority of co-owners can grant a licence. Consent of all co-owners is required, so a single holdout can block it.
- Thinking each co-owner owns a separate part of the invention. The shares are undivided in the whole patent.
- Signing a licence with only one of several co-owners; the licence may be ineffective against the others.
- Leaving co-ownership terms to be decided later, after the technology has become valuable and positions have hardened.
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 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
Case law is added slowly and deliberately. A summary is drafted, checked against the reported judgment and then reviewed before publication, because a wrong case note can mislead a reader badly. No summary for this provision has reached publication yet. How case notes are prepared.
Questions people ask about Section 50
Do joint patentees have to share profits in India?
Not by default. Section 50 allows each co-owner to make, use, exercise and sell the patented invention for his own benefit without accounting to the other co-owners. So a co-owner who builds a business on the patent can keep the profit unless the co-owners have agreed otherwise. This is why a co-ownership or joint development agreement matters. Such an agreement can set out revenue sharing, who leads commercialisation, who pays renewal fees, and what happens if one owner wants to exit.
Can one co-owner licence a jointly owned Indian patent?
No. A co-owner cannot grant a licence under the patent, and cannot assign his share, without the consent of the other co-owners. This applies whatever the size of his share. A licensee who takes a licence from only one co-owner is exposed, because the other co-owners have not consented. Prospective licensees should always check the Register of Patents to see who the recorded proprietors are, and obtain signatures from all of them.
What happens if co-owners cannot agree on anything?
Section 51 allows any co-owner to apply to the Controller for directions about the sale or lease of the patent or an interest in it, the grant of licences, or the exercise of rights. The Controller can also give directions where one co-owner refuses to join in an application or to execute a document, and may authorise another person to act in the name of the person refusing. The Controller will give everyone concerned a hearing, and will not decide disputed questions of title.
Should an inventor and a company be joint applicants?
It is a commercial decision, not a legal requirement. Joint ownership can look fair at the start but creates the licensing veto described above, and makes enforcement and assignment slower. Many collaborations instead put ownership in one party and give the other a defined licence, or record clear ownership and revenue terms in the research agreement before filing. Whatever route is chosen, it should be documented before the application is filed rather than afterwards.
Sharing a patent with a partner or institute?
MYCrave Consultancy drafts co-ownership and joint development terms so shares, licensing rights and revenue are settled before a dispute starts.
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