Patentability Criteria
The grant of a patent in India is not a reward conferred for effort, expenditure or commercial ambition. It is a calculated legal exchange the State grants an inventor a time-limited monopoly over an invention in return for full public disclosure of that invention, on the understanding that the disclosed knowledge will eventually enrich the public domain and stimulate further innovation. Patentability criteria are the legal filters through which this exchange is tested before the State agrees to proceed with it. The Patents Act, 1970, together with the Patents Rules, 2003 and the examination guidelines issued by the Office of the Controller General of Patents, Designs and Trade Marks (CGPDTM), lays down a precise and demanding set of conditions that an invention must satisfy before the Indian Patent Office will grant it protection. An applicant who misunderstands these conditions or who drafts claims without regard to them, frequently discovers the cost of that misunderstanding only after months of examination and a First Examination Report studded with objections.
This page sets out, in full statutory and judicial detail, what patentability means under Indian law: the definitional anchor in Section 2(1)(j), the three substantive requirements of novelty, inventive step and industrial applicability, the statutory exclusions under Sections 3 and 4 and the manner in which Indian courts and patent examiners have interpreted and applied each of these elements. It is intended to function as the definitive reference point for understanding patentability in India, in a manner consistent with how an Indian patent examiner, an advocate or a patent agent would actually analyse the question in practice.
What “Invention” Means Under Section 2(1)(j)
The entire architecture of Indian patentability law begins with a single definitional provision. Section 2(1)(j) of the Patents Act, 1970, defines an “invention” as a new product or process involving an inventive step and capable of industrial application. This sentence, compact as it is, contains the three substantive pillars on which every patentability determination in India ultimately rests: novelty, inventive step and industrial applicability. An applicant cannot satisfy patentability by demonstrating only one or two of these elements convincingly. All three must be made out and the absence of any single one is fatal to the application, regardless of how strong the others may be.
The Act supplies further definitional precision to two of these three pillars. Section 2(1)(ja) defines “inventive step” as a feature of an invention that involves technical advance as compared to the existing knowledge or having economic significance or both and that makes the invention not obvious to a person skilled in the art. This definition, introduced by the Patents (Amendment) Act, 2005, replaced an earlier and considerably thinner formulation that referred only to a feature making the invention “not obvious” the 2005 amendment deliberately added the technical advance and economic significance limbs, broadening the inquiry beyond pure technical non-obviousness to recognise that an invention may also satisfy the inventive step requirement through demonstrable economic significance, even where the technical advance alone might be regarded as marginal. Section 2(1)(l) separately defines a “new invention” as any invention or technology that has not been anticipated by publication in any document or used in the country or elsewhere in the world, before the date of filing the patent application with a complete specification in other words, the subject matter must not have fallen into the public domain and must not form part of the existing state of the art anywhere in the world. This is the statutory anchor for the novelty requirement and its global scope is deliberate: prior disclosure anywhere on earth, in any language, in any form of publication or use, can defeat novelty in an Indian application, regardless of whether that disclosure was ever known to or discoverable by the Indian applicant.
Novelty – The Requirement of Absolute, Worldwide Newness
Novelty is the threshold and, in a strict logical sense, the first inquiry in any patentability analysis, because an invention that is not new cannot meaningfully be assessed for inventive step at all there is nothing left to compare for advance or non-obviousness once the claimed subject matter is shown to already exist in the prior art. Under Section 2(1)(l), novelty in India is judged on an absolute, worldwide basis. There is no territorial limitation and, critically, no grace period of general application that would permit an inventor to publicly disclose an invention and still file a valid patent application in India some months later. Other than narrow statutory exceptions under Section 31 of the Act covering disclosure at certain recognised exhibitions and learned society proceedings under tightly defined conditions any prior publication or prior public use anywhere in the world before the filing date of the complete specification is capable of anticipating and thereby destroying, the novelty of an Indian patent application.
The concept that does the operative work here is “anticipation.” A claim is anticipated and therefore not novel, where a single prior art document or instance of prior use discloses every element of the claimed invention, either expressly or as a matter of necessary implication to a person skilled in the art. Indian patent examination practice draws directly on this single-document, all-elements approach: where the entirety of a claim can be read onto one piece of prior art, novelty fails and no combination of multiple prior art references is permitted at the novelty stage that kind of multi-reference combination analysis belongs instead to the separate inventive step inquiry. Applicants and their drafters must therefore treat the novelty search not merely as a formality but as the foundation on which the entire claim strategy is built, since a claim drafted without an accurate appreciation of the closest prior art is liable to be drafted either too broadly, inviting an anticipation objection or unnecessarily narrowly, sacrificing commercially valuable scope that a properly conducted search would have shown to be available.
Inventive Step – Technical Advance, Economic Significance and the Person Skilled in the Art
Where novelty asks whether the invention is new, inventive step asks the harder and more contested question of whether it represents a sufficient advance over what was already known to merit the grant of a monopoly. The statutory test under Section 2(1)(ja) requires that the claimed feature involve a technical advance as compared with existing knowledge or have economic significance or both and that this advance or significance render the invention not obvious to a person skilled in the art.
The “person skilled in the art” is a deliberate legal fiction a hypothetical individual possessing ordinary skill and general knowledge in the relevant technical field as it stood at the priority date, but possessing no inventive ingenuity of their own. The inventive step inquiry asks whether such a person, confronted with the prior art as a whole, would have arrived at the claimed invention as a matter of routine deduction or whether reaching the claimed invention required a genuine creative leap beyond what was obvious. This standard was authoritatively addressed by the Supreme Court of India in Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries, (1979) 2 SCC 511, a case arising under the predecessor Indian Patents and Designs Act, 1911, but whose reasoning continues to govern inventive step analysis under the 1970 Act. The dispute concerned a patent granted to Hindustan Metal Industries for a device and method of manufacturing brass and German silver utensils, improving the safety, speed and finish of the existing manufacturing process. The Supreme Court, examining whether the claimed device represented a genuine inventive step over what was already known and practised at Mirzapur, held that the patented improvement was neither a manner of new manufacture nor a distinctive advance involving any novelty or inventive ingenuity, but was instead a mere workshop improvement of the kind that any skilled workman familiar with the trade would have arrived at without need for any spark of inventive thought. The patent was accordingly held invalid for want of inventive step. The judgment remains the leading Indian authority for the proposition that a patent must reflect a genuine technical contribution beyond ordinary skill and that courts will look past the formal grant of a patent to scrutinise, on the actual evidence of what was known in the trade, whether the claimed advance was truly inventive or merely a routine refinement that any person skilled in the art would have made as a matter of course.
In current Indian Patent Office practice, inventive step examination generally proceeds through a structured, prior-art-driven sequence: the examiner first identifies the closest prior art reference or references; next identifies the features that distinguish the claimed invention from that prior art; and finally evaluates whether those distinguishing features produce a demonstrable technical effect, technical advance or economic significance that would not have been obvious to the person skilled in the art at the relevant date. Unlike the single-document approach used for novelty, inventive step analysis permits the examiner to combine multiple prior art references, provided there is a reasonable basis ordinarily found within the prior art itself or within the general knowledge of the person skilled in the art for combining them. Applicants facing inventive step objections in a First Examination Report must therefore engage directly and specifically with the cited prior art combination, demonstrating either that the proposed combination would not have been obvious to attempt or that the resulting combination would not have been expected to succeed or that the claimed invention achieves a technical result that the cited references, individually or in combination, neither disclose nor render predictable.
Industrial Applicability – Capability of Being Made or Used in an Industry
The third pillar, industrial applicability, is the least frequently litigated of the three substantive requirements but performs an essential gatekeeping function of its own. It ensures that patent protection is reserved for inventions with concrete, practical utility capable of being made or used in some branch of industry, rather than for abstract ideas, purely theoretical constructs or speculative proposals that exist only on paper. An invention that is undeniably novel and inventive but incapable of any practical industrial application because it does not work, because it cannot be reproduced with the disclosure provided or because it exists only as an unworkable theoretical proposition cannot be patented in India. Industrial applicability is generally assessed by examiners at a relatively early stage of the analysis, since an invention that plainly lacks any practical utility need not detain the examiner with detailed novelty or inventive step comparisons at all. In practice, industrial applicability objections most frequently arise in connection with inventions whose specifications fail to enable a person skilled in the art to actually make or use the claimed invention, a deficiency that often overlaps with, but remains analytically distinct from, the separate sufficiency-of-disclosure requirements under Section 10 of the Act governing the contents of the complete specification.
Section 3 – Subject Matter Statutorily Excluded From Being “Inventions”
Even where an invention clears the threshold of novelty, inventive step and industrial applicability, it does not automatically qualify for patent protection in India. Section 3 of the Patents Act, 1970, enumerates an extensive list of subject matter that Parliament has expressly declared “not to be inventions” within the meaning of the Act. This is, in practical examination experience, the single most common ground on which Indian patent applications encounter sustained objection and a sound understanding of Section 3 is indispensable to any serious patent filing strategy in India.
Section 3(a) excludes inventions that are frivolous or that claim anything obviously contrary to well-established natural laws. Section 3(b) excludes inventions whose primary or intended use or commercial exploitation would be contrary to public order or morality or which cause serious prejudice to human, animal or plant life or health or to the environment. Section 3(c) excludes the mere discovery of a scientific principle or the formulation of an abstract theory or the discovery of any living thing or non-living substance occurring in nature. Section 3(d) the provision that has generated the single most consequential body of Indian pharmaceutical patent litigation excludes the mere discovery of a new form of a known substance that does not result in the enhancement of the known efficacy of that substance and the mere discovery of any new property or new use of a known substance or of the mere use of a known process, machine or apparatus, unless that known process results in a new product or employs at least one new reactant. The Explanation appended to Section 3(d) further clarifies that salts, esters, ethers, polymorphs, metabolites, pure forms, particle sizes, isomers, mixtures of isomers, complexes, combinations and other derivatives of a known substance are to be considered the same substance, unless they differ significantly in properties with regard to efficacy.
This provision received its definitive judicial interpretation from the Supreme Court of India in Novartis AG v. Union of India, (2013) 6 SCC 1, arising from an application concerning the beta crystalline form of imatinib mesylate, the active compound in the leukaemia drug marketed as Glivec or Gleevec. The Supreme Court upheld the rejection of the application, holding that the applicant had failed to demonstrate that the claimed beta crystalline form produced any significant enhancement in therapeutic efficacy over the previously known form of the molecule and drawing a sharp and now-foundational distinction between improvements in physico-chemical properties such as better flowability, improved hygroscopic stability or easier processability which the Court held were insufficient to satisfy Section 3(d) and genuine enhancement of therapeutic efficacy, which the provision specifically demands. The judgment is binding authority that continues to govern the patentability of new forms, salts, polymorphs and derivatives of known pharmaceutical substances in India and it reflects a deliberate, considered policy choice by Parliament to resist the practice known internationally as “evergreening,” whereby originator pharmaceutical companies seek successive patents on minor variations of an already known and already patented active compound in order to extend market exclusivity beyond the original patent term.
Section 3 continues with a series of further exclusions of considerable practical significance. Section 3(e) excludes a mere admixture resulting only in the aggregation of the properties of its components or a process for producing such an admixture, unless the combination produces a genuine synergistic effect not predictable from the properties of the individual components. Section 3(f) excludes the mere arrangement, rearrangement or duplication of known devices, each functioning independently of one another in a known way. Section 3(h) excludes methods of agriculture or horticulture. Section 3(i) excludes any process for the medicinal, surgical, curative, prophylactic, diagnostic, therapeutic or other treatment of human beings or any process for a similar treatment of animals, to render them free of disease or to increase their economic value or that of their products a provision rooted in the policy judgment that medical practitioners must remain free to apply any available method of treatment to a patient without fear of patent infringement liability. Section 3(j) excludes plants and animals in whole or any part thereof, other than micro-organisms, including seeds, varieties and species and essentially biological processes for the production or propagation of plants and animals a provision that, notably, preserves the patentability of genuinely engineered micro-organisms and recombinant cell lines even as it excludes naturally occurring biological processes and higher life forms from patent protection.
Section 3(k) addresses one of the most actively contested categories in current Indian patent practice: it excludes a mathematical or business method or a computer programme per se or algorithms. The words “per se” have been the subject of extensive interpretive debate, since they signal that not every invention involving a computer programme is automatically excluded an invention that produces a genuine technical effect or technical contribution through the operation of software, going beyond the normal physical interaction between software and the underlying hardware, may fall outside the Section 3(k) exclusion. The CGPDTM’s Guidelines for Examination of Computer Related Inventions, most recently revised in 2017, attempt to operationalise this distinction for examiners and the Delhi High Court’s decision in Ferid Allani v. Union of India, W.P.(C) 7416/2014, remanded a rejected computer-implemented invention back to the Patent Office with directions to assess more carefully whether a genuine technical contribution existed, rather than applying a blanket exclusion to any claim that happens to involve software. Section 3(l) and Section 3(m) exclude literary, dramatic, musical or artistic works and mere schemes, rules or methods of performing mental acts, playing games or doing business categories of subject matter that more properly belong, where protectable at all, within the separate domain of copyright law. Section 3(p) excludes an invention which, in effect, is traditional knowledge or which is an aggregation or duplication of known properties of traditionally known components or components thereof a provision reflecting India’s particular concern with preventing the patenting of knowledge that has long existed within indigenous and traditional communities, reinforced administratively through the Traditional Knowledge Digital Library maintained jointly by the CGPDTM and the Council of Scientific and Industrial Research.
Section 4 – The Absolute Exclusion of Atomic Energy Inventions
Section 4 of the Patents Act, 1970, operates differently from Section 3 in both character and scope. Where Section 3 sets out a broad and varied catalogue of excluded subject matter calibrated to different policy concerns, Section 4 is narrow but entirely absolute: no patent shall be granted in respect of an invention relating to atomic energy falling within sub-section (1) of Section 20 of the Atomic Energy Act, 1962. This provision reflects the sovereign State’s retained and exclusive control over technologies bearing on national security, public safety and strategic interest and admits of no balancing exercise or case-by-case assessment of the kind that animates several of the Section 3 exclusions if an invention falls within the defined scope of Section 20(1) of the Atomic Energy Act, 1962, it is excluded from Indian patent protection as a matter of law, without further inquiry into its novelty, inventive step or industrial applicability.
How the Indian Patent Office Sequences the Patentability Inquiry
In practical examination, the CGPDTM’s examiners apply these statutory provisions in a broadly consistent analytical sequence and applicants and their drafting counsel benefit from understanding that sequence when anticipating likely objections. The examiner first asks whether the claimed subject matter qualifies as an “invention” within the meaning of Section 2(1)(j) at all. The examiner then proceeds to the three substantive requirements, typically assessing novelty first, since a finding of anticipation often disposes of the inventive step inquiry as a practical matter, followed by inventive step and industrial applicability. Running in parallel with and frequently overlapping, this substantive assessment is the question of whether the claimed subject matter falls within any of the exclusions under Section 3 or the absolute bar under Section 4. Finally, the examiner considers whether the complete specification satisfies the disclosure and sufficiency requirements under Section 10 of the Act, since even an invention that clears every substantive and exclusionary hurdle can still be refused or later revoked, if the specification does not sufficiently and clearly describe the invention and the manner in which it is to be performed.
Why This Sequence Matters for Drafting and Prosecution Strategy
The practical significance of this layered structure for applicants filing in India cannot be overstated. An invention may be genuinely novel, may represent a real technical advance and may have obvious industrial utility and yet remain entirely unpatentable in India if it falls within one of the Section 3 exclusions a position that frequently surprises applicants accustomed to patent regimes with narrower or differently configured subject-matter exclusions. Conversely, an invention that easily avoids every Section 3 exclusion may still fail outright if it cannot clear the novelty or inventive step bar. Sound Indian patent strategy therefore requires drafting counsel to test a proposed claim set against all five gates simultaneously from the earliest stages of specification drafting the definitional threshold of Section 2(1)(j), novelty, inventive step, industrial applicability and the Section 3 and Section 4 exclusions rather than treating patentability as a single, undifferentiated question to be addressed only once a First Examination Report has already issued. Applicants in pharmaceutical, biotechnology and software-related fields in particular should anticipate that Sections 3(d), 3(j) and 3(k) respectively are likely to feature prominently in examination and should structure their specifications and claims from the outset to make the case for genuine therapeutic efficacy enhancement, patentable micro-organism or process-based subject matter or demonstrable technical effect, as the relevant exclusion may demand, rather than attempting to address these concerns only reactively once an objection has already been raised.
Internal cross-references:
See also : What is a Patent? and Types of Patents for related foundational concepts and the Acts & Rules page for the full statutory text of the Patents Act, 1970.
Frequently Asked Questions
Q. What are the three basic criteria for patentability in India?
A. An invention must satisfy novelty, inventive step and industrial applicability under Section 2(1)(j) of the Patents Act, 1970. Novelty means the invention has not been disclosed anywhere in the world before the filing date. Inventive step, defined under Section 2(1)(ja), means the invention involves a technical advance or economic significance or both, that would not be obvious to a person skilled in the art. Industrial applicability means the invention is capable of being made or used in some form of industry. All three conditions must be satisfied together; meeting only one or two is not sufficient for a patent to be granted.
Q. Is patentability the same as patent eligibility?
A. No. In Indian patent law, patent eligibility generally refers to whether the claimed subject matter falls within the statutory definition of “invention” under Section 2(1)(j) and is not excluded under Section 3 or Section 4. Patentability is the broader and final determination, which additionally requires the invention to satisfy novelty, inventive step, industrial applicability and the sufficiency-of-disclosure requirements under Section 10. An invention can be eligible subject matter and still fail to be patentable if it lacks novelty or inventive step.
Q. What inventions are not patentable under Section 3 of the Patents Act, 1970?
A. Section 3 excludes a wide range of subject matter, including frivolous inventions, inventions contrary to public order or morality, mere discoveries of scientific principles or naturally occurring substances, new forms of known substances without enhanced efficacy under Section 3(d), mere admixtures without synergistic effect, methods of agriculture or horticulture, methods of medical or surgical treatment of humans or animals, plants and animals other than micro-organisms, mathematical and business methods, computer programmes per se and algorithms under Section 3(k) and traditional knowledge under Section 3(p).
Q. Why was the Novartis patent for Glivec rejected in India?
A. In Novartis AG v. Union of India, (2013) 6 SCC 1, the Supreme Court held that the beta crystalline form of imatinib mesylate did not satisfy Section 3(d) of the Patents Act, 1970, because Novartis failed to demonstrate that the new crystalline form produced a significant enhancement in therapeutic efficacy over the previously known form of the molecule. The Court held that improvements in physico-chemical properties such as stability or flowability are not sufficient to meet the efficacy threshold under Section 3(d).
Q. Can software be patented in India?
A. Computer programmes “per se” are excluded from patentability under Section 3(k) of the Patents Act, 1970. However, an invention is not automatically excluded merely because it involves software. Where a computer-related invention produces a genuine technical effect or technical contribution beyond the normal interaction between software and hardware, it may fall outside the Section 3(k) exclusion. The Delhi High Court’s ruling in Ferid Allani v. Union of India clarified that such inventions must be assessed on their technical contribution rather than refused on a blanket basis and the CGPDTM’s Guidelines for Examination of Computer Related Inventions, 2017, govern current examination practice.
Q. What is the test for inventive step in India?
A. he leading authority is Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries, (1979) 2 SCC 511, in which the Supreme Court held that a patent must reflect a genuine technical advance beyond the ordinary skill of a person in the trade and that a mere workshop improvement that any skilled workman would have arrived at without inventive ingenuity cannot satisfy the inventive step requirement. Examiners typically identify the closest prior art, determine the distinguishing features of the claimed invention and assess whether those features would have been obvious to a person skilled in the art at the relevant date.
Q. Why are atomic energy inventions excluded under Section 4?
A. Section 4 of the Patents Act, 1970, provides that no patent shall be granted for an invention relating to atomic energy as defined under Section 20(1) of the Atomic Energy Act, 1962. This exclusion is absolute and reflects the State’s sovereign control over technologies with national security and strategic implications. Unlike Section 3, Section 4 does not involve any case-by-case balancing; if an invention falls within the defined scope, it is excluded as a matter of law.
Q. Does an invention need a grace period to remain novel in India?
A. India does not provide a general grace period for public disclosure before filing. Novelty under Section 2(1)(l) is assessed on an absolute, worldwide basis and any prior publication or use anywhere in the world before the filing date can defeat novelty. Limited statutory exceptions exist under Section 31 for disclosure at certain recognised exhibitions and before learned societies, subject to strict conditions, but applicants should generally file before any public disclosure of the invention.