Sections 29 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.
Chapter VI of the Act lists situations in which an earlier disclosure does not count as anticipation. Sections 29, 30 and 31 cover four of them: certain old Indian specifications and publications made without the inventor's consent; communication of an invention to the Government; display at a notified exhibition; and a paper before a learned society. Each carries conditions, and one carries a twelve-month filing window. Because loss of novelty cannot be undone, anyone planning a patent search and prior art review should know where these protections stop.
An invention is not deemed anticipated by reason only of: (29) publication in an Indian specification dated before 1 January 1912, or a publication without the applicant's consent of matter obtained from him, if he applies as soon as reasonably practicable and the invention was not commercially worked in India earlier; (30) communication to the Government or a person it authorises to investigate it; (31) display at a notified exhibition or a paper before a learned society, if the application is made not later than twelve months afterwards.
Section 29: anticipation by previous publication
Section 29(1): specifications before 1912
"An invention claimed in a complete specification shall not be deemed to have been anticipated by reason only that the invention was published in a specification filed in pursuance of an application for a patent made in India and dated before the 1st day of January, 1912."
This fits with section 13(1)(a), where the examiner's search of Indian specifications covers those "dated on or after the 1st day of January, 1912". Together they mark the line at that date. See our article on section 13. The text does not give the reason for the date.
Section 29(2): publication without consent
"Subject as hereinafter provided, an invention claimed in a complete specification shall not be deemed to have been anticipated by reason only that the invention was published before the priority date of the relevant claim of the specification, if the patentee or the applicant for the patent proves—"
The applicant must prove both:
| Limb | What must be proved |
|---|---|
| (a) | "that the matter published was obtained from him, or (where he is not himself the true and first inventor) from any person from whom he derives title, and was published without his consent or the consent of any such person" |
| (b) | Where the applicant (or a person he derives title from) "learned of the publication before the date of the application", or, for a convention application, before the date of the application for protection in a convention country, that the application "was made as soon as reasonably practicable thereafter" |
Limb (a) is about how the publication came about: the matter came from the applicant (or his predecessor in title) and was published without consent. Limb (b) is about speed: once he learned of the publication, he applied "as soon as reasonably practicable". The Act gives no number of days for "reasonably practicable".
The proviso. So if the invention was commercially worked in India before the priority date (other than for reasonable trial), by the applicant, a predecessor, or anyone with their consent, sub-section (2) does not apply.
Example. Prakash, a fictional dye chemist, shares a draft formula with a supplier under confidence. The supplier posts it on a trade forum without Prakash's consent. Prakash finds out in March and files in April. Under section 29(2) he must prove the formula was obtained from him and published without his consent, and that he applied as soon as reasonably practicable after learning of it. If he had been selling the dye commercially in India before his priority date, the proviso would take the case outside sub-section (2).
Section 29(3): rival applications in contravention of the inventor's rights
The true and first inventor, or a person deriving title from him, is not anticipated by (i) another application for the same invention made "in contravention of the rights of that person", or (ii) later use or publication, without his consent, by that other applicant or by anyone in consequence of that applicant's disclosure.
Section 30: communication to the Government
"An invention claimed in a complete specification shall not be deemed to have been anticipated by reason only of the communication of the invention to the Government or to any person authorised by the Government to investigate the invention or its merits, or of anything done, in consequence of such a communication, for the purpose of the investigation."
Two points: the protection is for communication to the Government or a person authorised by the Government to investigate the invention or its merits, and it covers things done "for the purpose of the investigation". The section gives no time limit. The words "by reason only" mean the section stops that communication alone from counting as anticipation; other disclosures are not covered.
Section 31: public display and learned societies
"An invention claimed in a complete specification shall not be deemed to have been anticipated by reason only of—"
| Clause | Event |
|---|---|
| (a) | Display of the invention, with the consent of the true and first inventor (or a person deriving title), at an industrial or other exhibition to which section 31 has been extended by the Central Government by notification in the Official Gazette, or use with his consent for the purpose of the exhibition in the place where it is held |
| (b) | Publication of any description of the invention in consequence of the display or use at such an exhibition |
| (c) | Use of the invention, after it has been displayed or used at such an exhibition and during the period of the exhibition, by any person without the consent of the true and first inventor or person deriving title |
| (d) | Description in a paper read by the true and first inventor before a learned society, or published with his consent in the transactions of such a society |
The condition: "if the application for the patent is made by the true and first inventor or a person deriving title from him not later than twelve months after the opening of the exhibition or the reading or publication of the paper, as the case may be."
Key points:
- Notified exhibitions only. Display at an exhibition counts only if the Central Government has extended section 31 to it by Gazette notification. The Act does not name any exhibition.
- Twelve months. The words "not later than twelve months" replaced "not later than six months" in 2005 (with effect from 1-1-2005). Any older text that says six months is out of date.
- Counted from the opening of the exhibition, or the reading or publication of the paper.
- Who files. The true and first inventor or a person deriving title from him. A paper read by someone other than the true and first inventor is not within clause (d).
Example. Dr Ishaan Rao, a fictional engineer, demonstrates his hand-powered pump at an exhibition that the Central Government has notified for the purposes of section 31, with his consent. He reads a paper on it before a learned society two months later. He files his application nine months after the exhibition opens. On the text, the display and the paper do not by themselves anticipate the invention, since the application was made within twelve months. Had he filed 14 months after the exhibition opened, clause (a) to (d) protection would not apply on the text.
What these sections do not say
- They do not define "learned society", "industrial or other exhibition" or "commercially worked", or list the notified exhibitions.
- They protect only against anticipation "by reason only" of the listed events.
For a broader look at novelty and what is patentable, see our post on what is patentable in India. Sections 32 to 34 continue this chapter and are covered in our article on anticipation by public working.
Need help with ...?
Before you display, publish or present an invention, check which of these protections can apply and how long the window is. Our team can help you map earlier disclosures against your filing date through patent search and prior art support.
Key takeaways
- Publication in an Indian specification dated before 1 January 1912 is not anticipation by itself.
- Unconsented publication of matter obtained from the applicant is protected only if he applies as soon as reasonably practicable and the invention was not commercially worked in India earlier.
- Communication to the Government or an authorised investigator is not anticipation by itself.
- Display at a notified exhibition or a paper before a learned society is protected if the application follows within twelve months.
- The twelve months replaced six months in 2005.
Read next
- Section 32 to 34: anticipation by public working and after a provisional specification
- Section 13: search for anticipation
- Section 18 to 20: Controller powers on anticipation
- Prior art search for patents
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.