Patent prosecution is the process of pursuing a patent application through the Indian Patent Office, from filing to grant, including examination, responding to objections, hearings, and overcoming opposition. Under Indian law, this process is governed by Sections 12-23 of the Patents Act, 1970 and involves a structured sequence of steps with prescribed timelines.
Legal definition
The Patents Act, 1970 does not define "patent prosecution" as a term but establishes the entire process through its procedural provisions:
Stage 1 — Filing (Section 7-9): The applicant files a patent application with either a provisional or complete specification at the appropriate Patent Office. If a provisional specification is filed, the complete specification must follow within 12 months.
Stage 2 — Publication (Section 11A): The application is published in the Official Gazette after 18 months from the priority date. Early publication can be requested by paying the prescribed fee. After publication, the application is open to public inspection and pre-grant opposition.
Stage 3 — Request for Examination (Section 11B): The applicant must file a request for examination within 48 months from the priority date or filing date, whichever is earlier. If no request is filed, the application is treated as withdrawn.
Stage 4 — Examination (Section 12-15): The Controller refers the application to an examiner who prepares a First Examination Report (FER) identifying objections relating to novelty, inventive step, patentable subject matter, and compliance. The applicant must respond to the FER within 6 months (extendable by 3 months).
Stage 5 — Pre-grant Opposition (Section 25(1)): Any person may file a pre-grant opposition after publication but before grant, on grounds including anticipation, obviousness, and non-patentable subject matter.
Stage 6 — Grant (Section 43): If the Controller is satisfied that all requirements are met and objections resolved, the patent is granted. The patent is dated from the filing date and has a term of 20 years from the filing date.
How courts have interpreted this term
Enercon (India) Ltd. v. Alloys Wobben [(2014) 1 SCC 1]
The Supreme Court addressed the scope of the Controller's powers during patent prosecution. The Court held that the Controller has the authority to refuse a patent application if the claims are not fairly based on the matter disclosed in the specification, even if novelty and inventive step are established. The Controller's examination must be comprehensive, covering all grounds of patentability.
Natco Pharma Ltd. v. Bayer Corporation [(2012) IPAB]
The Intellectual Property Appellate Board (now High Court) examined the prosecution history of Bayer's Sorafenib patent in the context of a compulsory licence application. The Board noted that statements made during prosecution — including claim amendments and arguments — can be used to interpret the scope of the granted claims, applying the doctrine of prosecution history estoppel.
Why this matters
Patent prosecution is the practical process through which an invention becomes a legally enforceable monopoly. The quality of prosecution directly affects the scope and enforceability of the granted patent. A well-prosecuted patent with carefully drafted claims and thorough responses to office actions is far more defensible than one where objections were inadequately addressed.
For Indian applicants, the 48-month deadline for requesting examination is a critical timeline. Missing this deadline results in the application being treated as withdrawn, with no possibility of revival. The 6-month response window for the First Examination Report is equally critical — if the applicant fails to respond or resolve all objections within this period (plus the 3-month extension), the application is refused.
The average prosecution timeline in India has improved significantly. The Indian Patent Office aims to process applications within 30 months of the request for examination, though timelines vary by technology area. Pharmaceutical and biotechnology applications tend to face more rigorous examination and longer prosecution than mechanical or electrical inventions.
For foreign applicants entering India through the Patent Cooperation Treaty (PCT) or the Paris Convention, the prosecution history from other jurisdictions may inform the Indian examination but does not bind the Indian Patent Office. The Controller independently examines each application under Indian law.
Related terms
Broader concepts:
Related prosecution concepts:
Frequently asked questions
How long does patent prosecution take in India?
From filing to grant, patent prosecution in India typically takes 3-5 years, depending on the technology area, the complexity of objections, and whether opposition is filed. The Indian Patent Office has been working to reduce timelines. Key milestones: publication at 18 months, examination within 48 months, response to FER within 6 months (+3 months extension).
What is a First Examination Report (FER)?
The FER is the initial report by the patent examiner identifying objections to the patent application. Common objections include lack of novelty, lack of inventive step, non-patentable subject matter (Section 3), and insufficiency of disclosure. The applicant must respond to all objections within 6 months, extendable by 3 months.
Can a patent application be revived after being treated as withdrawn?
If the application is treated as withdrawn for failure to request examination within 48 months, revival is not possible. However, if the application was treated as abandoned for failure to file a complete specification within 12 months of a provisional, the period may be extended in limited circumstances under the Patent Rules.
This entry is part of the Veritect Indian Legal Glossary, a comprehensive reference of Indian legal terminology grounded in statutory text and judicial interpretation.
Last updated: 2026-03-27. Veritect provides this content for informational purposes and does not constitute legal advice.