Section 143 of the Patents Act, 1970
Restrictions upon publication of specification
Section 143 keeps a patent application and its specification confidential at the Patent Office until the application is published.
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.
Treat this page as a guide. The provision as officially published, along with the Gazette notifications that apply to it, remains the governing text and overrides any simplification here.
What this section says, in plain language
Section 143 protects the secrecy of an application before it becomes public. Until the application is published under Section 11A, the Controller may not publish the application, the specification or the other documents on file, and members of the public cannot inspect them. The only way that curtain lifts early is with the applicant's own consent, which in practice is given by asking for early publication.
This matters because a patent application is a bargain. The inventor eventually has to teach the public how the invention works, but only in exchange for the possibility of a patent. If the disclosure leaked out before the applicant was ready, a competitor could copy the invention while the applicant still had no enforceable right. Section 143 makes the office side of that bargain safe. It sits alongside Section 39, which stops residents of India from filing abroad first without permission, and Section 35, which allows secrecy directions on defence-related inventions.
The default publication point is set by Section 11A and Rule 24: the application is published after the expiry of eighteen months from the date of filing or the priority date, whichever is earlier. Until that day arrives, only the bare bibliographic facts appear on the office systems, not the technical content. An applicant who wants publication sooner, perhaps to start the eighteen month clock on provisional rights or to bring a licensing negotiation forward, files a request for early publication in Form 9 under Rule 24A. That request is the consent Section 143 speaks of.
There is a further consequence that applicants often miss. Because the file is confidential before publication, the applicant retains a genuine option to withdraw. A request for withdrawal made before publication keeps the disclosure out of the public domain entirely, which preserves the possibility of keeping the invention as a trade secret or of refiling a better drafted application. Once publication happens the disclosure is permanent and becomes prior art against everyone, including the applicant.
After publication the position reverses. Rule 27 allows the public to inspect and obtain copies of published documents, and Rule 74A opens the documents relating to grant to inspection. Section 143 therefore describes a window, not a permanent shield.
Why this section matters
Any applicant whose application is still pending publication, including inventors deciding between patenting and secrecy, and businesses filing sensitive process improvements.
From the date of filing until the day the application is published under Section 11A, or earlier if the applicant asks for early publication.
A duty on the Controller not to publish or open the file, and a corresponding right in the applicant to control when the technical disclosure becomes public.
Applicants who assume secrecy continues indefinitely are surprised when the full specification appears in the Official Journal at eighteen months and becomes citable prior art worldwide.
How it works in practice
A withdrawal decided in the confidential window
Ananya Rao, a food technologist in Mysuru, filed a complete specification for a low-cost method of stabilising millet flour. Eleven months later a contract manufacturer offered to buy her process outright, but only if it stayed off the public record, because the commercial advantage lay in the exact temperature profile rather than in any device. Ananya checked the position. Her application had not yet reached the eighteen month publication point, and because of Section 143 nothing about the technical content was available to the public or to the manufacturer's competitors. She was able to file a request for withdrawal before publication, so the method never entered the public domain and could be protected by contract as confidential know-how instead. Had she waited two more months, publication under Section 11A would have been automatic, the specification would have become permanent prior art, and the trade secret route would have closed forever. The confidential window is short, and it is a genuine decision point.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- Before publication, the Controller cannot publish the application or open it for public inspection.
- The applicant can lift the confidentiality early by asking for early publication in Form 9.
- Default publication is after eighteen months from the earlier of the filing date and the priority date.
- The confidential period is the last realistic chance to withdraw and keep the invention a trade secret.
- After publication, Rule 27 and Rule 74A open the documents to public inspection.
- The section protects the file at the office; it does not stop the inventor's own careless disclosure elsewhere.
Common mistakes and misunderstandings
- Assuming a patent application is secret forever. Confidentiality ends automatically at publication whether or not the applicant does anything.
- Thinking a competitor can look up a pending application's claims at any time. Before publication only limited bibliographic details are visible.
- Believing that asking for early publication is harmless. It permanently ends the confidential window and closes the trade secret option.
- Confusing this section with the secrecy directions under Section 35, which are a national security measure and work quite differently.
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
Forms used under the Patents Rules are prescribed in the Second Schedule. They are revised when the Rules change, so download the current version from the Patent Office website rather than reusing a copy saved earlier.
- Confidentiality under this section lasts until publication, which under Section 11A happens after eighteen months from the date of filing or the priority date, whichever is earlier.
- Any decision to withdraw and preserve secrecy must be taken and filed before that publication happens.
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.
Amendment history
What changed in this provision, newest first. Read the footnotes in the official consolidated text for the full record.
- 2005The Patents (Amendment) Act, 2005The section was replaced. It now restricts disclosure of an application and its specification by the Patent Office before publication.
Compiled from official consolidated texts and Gazette notifications. See the site-wide change log.
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 143
Can anyone see my patent application before it is published?
No. Section 143 stops the Controller from publishing the application, the specification or the related documents, and stops the public from inspecting them, until publication under Section 11A. Only limited bibliographic information such as the application number and filing date is visible on the office systems in that period. The one exception is where the applicant consents, which in practice means the applicant has filed a request for early publication. Officers of the Patent Office are separately bound to confidentiality under Section 76.
How do I make my patent application public earlier?
File a request for early publication in Form 9 under Rule 24A with the prescribed fee. The Controller then publishes the application ahead of the ordinary eighteen month point, usually within a short time. Applicants do this to start the clock on the provisional rights that publication creates, to support a funding round or licensing talk, or to make a request for expedited examination possible. Remember that early publication is irreversible and ends the confidentiality this section provides.
Does Section 143 stop me from talking about my invention?
No. It binds the Patent Office, not the inventor. Your own public disclosure, a conference paper, a product launch or a social media post can still destroy novelty, subject to the narrow grace period situations in Sections 29 to 34 and Rule 29A. If you need to discuss the invention with an investor, a manufacturer or a supplier before publication, use a written confidentiality agreement. This section keeps the office file closed; it does not keep your own conversations private.
What happens to confidentiality if I withdraw my application?
If the withdrawal request reaches the office before publication, the technical content is never published, so the invention does not enter the public domain through the patent route. That leaves open the option of protecting it as confidential know-how or of filing a fresh, better drafted application later. If withdrawal comes after publication, the specification is already public and stays public, and it can be cited as prior art against any later application, including your own.
Deciding between publishing your application and keeping it secret?
MYCrave Consultancy helps applicants weigh early publication, withdrawal and trade secret protection before the eighteen month window closes.
You will be speaking with MYCrave Consultancy & Services, the firm that operates this platform. General questions are answered free; matter‑specific work is quoted before anything is done.