Section 46 explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Section 46 says three things about the patent itself. It must be in the prescribed form and has effect throughout India. It is granted for one invention only. And, once granted, nobody can raise in a suit or other proceeding the objection that it was granted for more than one invention. The last point gives a patentee a measure of comfort, but it makes the front-end rules on one invention per application all the more important, and they are worth getting right in patent drafting and filing.
Every patent is in the prescribed form and has effect throughout India (46(1)). A patent is granted for one invention only (46(2)), but it is not competent for any person, in a suit or other proceeding, to object to a patent on the ground that it has been granted for more than one invention (proviso).
Section 46(1): form and territorial effect
"Every patent shall be in the prescribed form and shall have effect throughout India."
"In the prescribed form". The form of a patent is "as prescribed", which means the Patents Rules, 2003. The Act does not describe the document and this article does not name a form number. Section 2(1)(u) says "prescribed" means prescribed by rules made under the Act (and, for proceedings before a High Court, by the High Court's rules); see our article on section 2 (Part 3). Section 43(1) adds that the patent is granted "with the seal of the patent office".
"Have effect throughout India". This matches section 1(2), which says the Act "extends to the whole of India". A patent is a single national right; there is no separate State-wise grant. Our article on section 1 covers the extent of the Act. The sub-section says nothing about protection in other countries, which depends on foreign law.
A practical consequence. Because the effect is nationwide, jurisdiction for enforcement is addressed elsewhere in the Act (section 104, covered later in this series), not in section 46.
Section 46(2): one invention only
"A patent shall be granted for one invention only:"
This repeats at the grant stage what section 7(1) says at the filing stage: "Every application for a patent shall be for one invention only". The two sit with section 10(5), which says the claims of a complete specification "shall relate to a single invention, or to a group of inventions linked so as to form a single inventive concept", and with section 16, which lets an applicant file a further application if the Controller objects that the claims relate to more than one invention. See our articles on section 7 and on sections 16 and 17, and the post on divisional applications.
The table below shows how the Act handles the "one invention" requirement at each stage.
| Stage | Provision | What it says |
|---|---|---|
| Filing | Section 7(1) | Every application for one invention only |
| Specification | Section 10(5) | Claims relate to a single invention or a group linked by a single inventive concept |
| Examination | Section 16(1) | A further application may be filed to remedy an objection that the claims relate to more than one invention |
| Grant | Section 46(2) | A patent is granted for one invention only |
| After grant | Section 46(2) proviso | No objection in a suit or other proceeding that the patent covers more than one invention |
The proviso: no later objection
"Provided that it shall not be competent for any person in a suit or other proceeding to take any objection to a patent on the ground that it has been granted for more than one invention."
The proviso bars one specific objection after grant. Its reach:
- Who: "any person". The words are not limited to the defendant in an infringement suit.
- Where: "in a suit or other proceeding". Proceedings before the Controller and before the High Court are within "other proceeding", in the ordinary sense of the words, though the Act does not list them here.
- What is barred: an objection "on the ground that it has been granted for more than one invention".
- What is not barred: every other objection. The proviso does not touch grounds such as lack of novelty or insufficient disclosure.
The practical meaning is that the "one invention" test is meant to be applied by the Controller before grant. After grant, a patent cannot be attacked for failing it. The proviso does not excuse the applicant from complying before grant, since the Controller may object under section 16 and sections 14 and 15 at the examination stage.
Example. Dhruv Instruments, a fictional company, is granted a patent covering a digital caliper and, in the same specification, a separate carrying case with a novel locking mechanism. Years later, in an infringement suit, the defendant argues that the patent is invalid because it was granted for two inventions. Under the proviso to section 46(2), it is not competent for the defendant to take that objection. The defendant may still raise other grounds that the Act allows, such as those in the sections on opposition and revocation.
What section 46 does not say
- It does not describe the content or layout of a patent; that is for the Rules.
- It does not give the term of the patent; that is section 53.
- It does not say who may assert the patent or what rights it confers; those are in section 48.
- It does not say that a patent which covers more than one invention is a good thing; it only bars the objection after grant.
- It does not deal with patents of addition; those are under section 54.
Need help with ...?
The "one invention" rule is better dealt with at the drafting stage, so that the Controller has nothing to object to and the granted patent covers exactly what you need. Our team can help you structure the specification and, where needed, a further application, through patent drafting and filing support.
Key takeaways
- A patent is in the prescribed form and has effect throughout India.
- A patent is granted for one invention only.
- After grant, no one can object in a suit or other proceeding that it was granted for more than one invention.
- Other objections to a patent are not barred by this proviso.
- The one-invention rule is applied before grant under sections 7, 10(5) and 16.
Read next
- Section 47: conditions of grant
- Section 48: rights of patentees
- Section 43: grant of patents
- Patent grant and certificate
Disclaimer: Based on the Patents Act, 1970 as amended up to the Jan Vishwas (Amendment of Provisions) Act, 2023, as consulted on 1 October 2026. Forms, fees and time limits under the Patents Rules, 2003 change from time to time and are not covered here. This article is general information, not legal advice; check the official text before acting.