Pre-grant Opposition to Patents

Pre-grant opposition allows a person to challenge a patent application before a patent is granted. Under Section 25(1) of the Patents Act, 1970, any person may submit a written representation to the Controller of Patents after the application is published but before grant, on specified statutory grounds.

Who can oppose and when

The mechanism enables public scrutiny of whether an application satisfies the legal requirements for a patent. It is an examination-stage safeguard, not a challenge to an already granted patent.

• Any person may oppose; the opponent need not establish a commercial interest in the invention.
• The statutory window opens with publication of the application and closes when the patent is granted.
• An opposition must identify grounds recognised by Section 25(1), rather than merely express general disagreement with patent protection.

Grounds of opposition

The grounds address both the claimed invention's patentability and specified defects in the application.

• The applicant may have wrongfully obtained the invention from the opponent or a person through whom the opponent claims.
• Prior publication, prior claiming, or prior public knowledge or use may defeat the application, subject to the statutory conditions for each ground.
• The claimed invention may be obvious or lack an inventive step.
• The subject matter may not qualify as an invention or may be excluded from patentability under the Act.
• The specification may fail to describe the invention or the method of performing it sufficiently and clearly.
• Other grounds include failures concerning foreign-application information under Section 8, delayed convention applications, incorrect or missing disclosure of biological-material origin, and anticipation by traditional knowledge.
• For pharmaceutical inventions, Section 3(d) can be relevant: a new form of a known substance is excluded unless it enhances that substance's known efficacy.

How the Controller decides

The representation is supported by a statement and evidence, if any, under Rule 55 of the Patents Rules, 2003. The Controller considers it through the prescribed procedure, including obtaining the applicant's response where required.

• Section 25(1) provides for the opponent to be heard if a hearing is requested.
• The Controller may reject the opposition, require amendment of the application or specification, or refuse the patent.

Distinction from post-grant opposition

Under Section 25(2), post-grant opposition is available only to a person interested, within one year from publication of the grant. Unlike pre-grant opposition, it involves an Opposition Board.