Prior art refers to all publicly available information (published documents, prior public knowledge, or prior public use anywhere in the world) that exists before the filing or priority date of a patent application and is relevant to determining whether the claimed invention is novel and involves an inventive step. Under Indian law, the concept is derived from Section 2(1)(l) of the Patents Act, 1970 (definition of "new invention") read with Section 13 (search for anticipation by previous publication and by prior claim).
Legal definition
The Patents Act, 1970 does not use the term "prior art" directly but establishes the concept through several provisions:
Section 2(1)(l): "New invention" means any invention or technology which has not been anticipated by publication in any document or used in the country or elsewhere in the world before the date of filing of patent application with complete specification.
Section 13(1): The examiner to whom an application for a patent is referred shall make investigation for the purpose of ascertaining whether the invention so far as claimed in any claim of the complete specification... has been anticipated by publication before the date of filing of the applicant's complete specification in any specification filed in pursuance of an application for a patent made in India.
Section 13(2): The examiner shall also make such investigation as the Controller may direct for the purpose of ascertaining whether the invention, so far as claimed, has been anticipated by publication in India or elsewhere in any document other than a specification.
India follows an absolute novelty standard — prior art includes publications and public use anywhere in the world, not just in India. This is stricter than some jurisdictions that apply relative novelty (considering only domestic prior art).
How courts have interpreted this term
Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries [(1979) 2 SCC 511]
The Supreme Court established the foundational principles of prior art analysis in India. The Court held that to anticipate a patent, a prior publication must contain a clear and unmistakable direction to do what the patentee claims to have invented. If the prior publication requires further experimentation or inventive effort to arrive at the claimed invention, it does not anticipate.
Novartis AG v. Union of India [(2013) 6 SCC 1]
The Supreme Court applied prior art analysis in the context of Section 3(d) of the Patents Act (excluding incremental innovations). The Court examined the prior art (the original Gleevec compound) against the claimed invention (the beta crystalline form of Imatinib Mesylate) and held that the claimed form did not demonstrate enhanced efficacy over the prior art, denying the patent.
Roche v. Cipla [(2016) Delhi HC]
The Delhi High Court conducted a detailed prior art analysis, examining whether the claims of Roche's Erlotinib patent were anticipated by earlier publications. The Court examined individual prior art references and their teachings to determine whether the invention was novel and non-obvious over the cited references.
Why this matters
Prior art determines whether a patent can be granted and whether a granted patent can be invalidated. Every patent examination involves searching prior art databases (patent databases, scientific journals, conference proceedings, trade publications, and publicly available products) to identify references that may anticipate the claimed invention or render it obvious.
For patent applicants, a thorough prior art search before filing is essential. Filing a patent application without searching prior art risks receiving objections during examination, spending significant time and resources in prosecution, and ultimately having the application rejected. A pre-filing search identifies potential obstacles and allows the applicant to draft claims that distinguish over the closest prior art.
For competitors challenging a patent, prior art is the primary weapon. Under Section 25 of the Patents Act, prior publication and prior public knowledge or use are grounds for both pre-grant opposition (Section 25(1)) and post-grant opposition (Section 25(2)). A single prior art reference that discloses all elements of a claim can invalidate the claim for lack of novelty.
Related terms
Broader concepts:
Related examination concepts:
Frequently asked questions
Does prior art include publications from outside India?
Yes. India follows an absolute novelty standard. Under Section 2(1)(l) of the Patents Act, 1970, an invention is not new if it has been anticipated by publication in any document or used in the country or elsewhere in the world. Prior art includes global publications, foreign patents, and public use in any country.
Can a product in the market constitute prior art?
Yes. Prior public use or prior public knowledge anywhere in the world before the filing date constitutes prior art. If a product embodying the claimed invention was commercially available before the patent application's filing date, it can anticipate the patent claims and render them invalid for lack of novelty.
What is the difference between anticipation and obviousness?
Anticipation (lack of novelty) requires that a single prior art reference discloses all elements of the claimed invention. Obviousness requires that the claimed invention, while not identically disclosed in a single reference, would have been obvious to a person skilled in the art based on the combined teachings of the prior art.
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.