Section 46 of the Patents Act, 1970
Form, extent and effect of patent
Section 46 says a patent is issued in the prescribed form, has effect throughout India, and is granted for one invention only.
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This explanation is written for clarity, not for citation.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
Three separate rules sit in this short section, and each of them answers a question that comes up constantly in practice.
The first is form. A patent is issued in the form the Rules prescribe, and Rule 74 deals with that. The document identifies the patent number, the patentee, the title of the invention, the date of the patent and the date of grant, and it is issued under the seal of the patent office. It is the title document that a licensee, a lender or a court will ask to see.
The second is extent. A patent has effect throughout India, in every State and Union Territory, and only in India. There is no such thing as a worldwide patent. Rights in Germany, Japan or the United States have to be obtained under the law of each of those countries, usually by filing there directly or through the Paris Convention or the Patent Cooperation Treaty. Indian residents must also comply with section 39 before filing abroad. Territoriality also shapes enforcement: the infringing act has to happen in India, although importing a patented product into India is itself among the acts a patentee can prevent under section 48.
The third is unity. A patent is granted for one invention only. This is the unity of invention principle. It is enforced during prosecution, where an objection can be raised that the claims cover more than one invention, and the applicant's answer is usually to file a divisional application under section 16, which keeps the date of the parent application.
The proviso is where the practical value lies. It is not open to any person, in a suit or other proceeding, to object to a patent on the ground that it was granted for more than one invention. So multiplicity is a matter to be sorted out during prosecution and cannot be used later as a weapon against the patent. Compare section 64, which lists the grounds on which revocation can actually be sought; lack of unity is not among them. A defendant who wants to attack validity has to find a ground that the Act recognises.
Why this section matters
Patentees, licensees and defendants in infringement matters, and applicants facing a unity of invention objection during examination.
It matters at grant, in every licence or transaction where territorial scope is defined, and whenever validity is attacked.
It creates a patent in prescribed form with effect across the whole of India, and confines each patent to a single invention.
Businesses assume an Indian patent protects them abroad, lose foreign rights, or waste effort attacking a patent on a ground the Act does not allow.
How it works in practice
One patent, one country, one invention
Sundar Agro Machines LLP of Coimbatore is granted an Indian patent for a seed metering mechanism. Two things follow quickly. A trading company in Sri Lanka begins making an identical mechanism and selling it locally. Sundar's Indian patent does nothing there, because under section 46 it has effect throughout India and only in India, and no application was ever filed in Sri Lanka. At the same time an Indian competitor imports the same mechanism into India and sells it in Tamil Nadu, and that is squarely within what the patent covers, because importation into India is one of the acts the patentee can prevent. In the resulting suit the competitor argues that the original application had really claimed two inventions, the metering mechanism and a separate seed hopper, and that the patent is therefore bad. That argument fails. The proviso to section 46 does not allow multiplicity to be raised as an objection in a suit.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- The patent is issued in the form prescribed by the Rules, and Rule 74 deals with the form of the patent.
- A patent has effect throughout India and only in India; there is no worldwide patent.
- Protection abroad must be obtained country by country, subject to section 39 for Indian residents.
- A patent is granted for one invention only, and unity objections are resolved during prosecution.
- A divisional application under section 16 is the usual response to a unity objection, and it keeps the parent date.
- No one may object in a suit or proceeding that a patent was granted for more than one invention.
Common mistakes and misunderstandings
- Believing an Indian patent gives protection in other countries. It does not, and separate applications are needed in each country of interest.
- Trying to invalidate a patent for lack of unity. The proviso to section 46 blocks that objection, and section 64 lists the grounds that do work.
- Ignoring a unity objection during examination. The proper response is a divisional under section 16, filed while the parent is still pending.
Connected provisions
The rules connected to a section are listed on their own because they are subordinate legislation. They cannot go beyond the Act, but they can be changed by notification without a new statute, so seeing them separately makes it easier to check whether the current procedure is still what you remember.
Forms, deadlines and fees
- A divisional application under section 16 must be filed while the parent application is still pending, so a unity objection should be addressed promptly.
- Foreign protection depends on foreign deadlines, including the twelve-month convention period for claiming priority from an Indian filing.
Open the deadline calculator — and have every date confirmed against the current Rules before you rely on it.
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
You will not find case summaries under this heading today. Each one must pass a legal review before it appears, and that work has not been completed for this provision. If you are researching decided cases, use a law report or a court database in the meantime. How case notes are prepared.
Questions people ask about Section 46
Does my Indian patent protect me in other countries?
No. A patent granted in India has effect throughout India and nowhere else. If you need protection in another market you have to obtain a patent there under that country's law, either by filing directly, by using the twelve-month convention priority period, or by filing an international application under the Patent Cooperation Treaty and then entering the national phase. If you are resident in India, section 39 also has to be complied with before any foreign application is made.
Can a patent be revoked because it covers more than one invention?
No. The proviso to section 46 says it is not open to any person, in a suit or other proceeding, to take an objection that a patent was granted for more than one invention. Unity of invention is a prosecution issue. It is raised by the examiner and answered by amendment or by filing a divisional application under section 16. The grounds on which a patent can actually be revoked are set out in section 64, and lack of unity is not one of them.
What does the patent document itself contain?
The patent is issued in the form prescribed by the Rules, and Rule 74 governs that form. It identifies the patent number, the name of the patentee, the title of the invention, the date of the patent, and the date on which it was granted, and it is issued under the seal of the patent office. It is the document produced in licensing, in financing and in litigation to establish that the patent exists and who holds it. The specification and claims that define the scope sit alongside it on the published file.
Where does your patent actually protect you?
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