Introduction
The modern world is driven by innovation, technology, and scientific advancement. Every day inventors create new machines, medicines, software, industrial processes, and technological products that improve human life and contribute to economic development. In order to encourage such innovation, the law grants protection to inventors through the system of patents.
A patent is one of the most important forms of Intellectual Property Rights (IPR). It protects inventions and grants exclusive rights to the inventor for a limited period of time. The patent system ensures that inventors are rewarded for their creativity and investment while also requiring them to disclose their inventions to the public. Thus, the patent system creates a balance between private rights and public interest.
In India, patent law is governed by the Patents Act, 1970. The Act defines what constitutes an invention, lays down the conditions for patentability, and also specifies certain inventions for which patent protection cannot be granted.
Not every idea or discovery is patentable. Only inventions fulfilling the legal requirements of novelty, inventive step, and industrial applicability qualify for patent protection. Sections 3 and 4 of the Act further exclude several categories of inventions from patentability on grounds of public policy, morality, lack of innovation, or public welfare.
This article discusses in detail the concept of patentable inventions and the categories of inventions which are not patentable under the Patents Act, 1970 along with important illustrations and judicial decisions.
Concept of Patent
The term “patent” originates from the Latin word patere, meaning “to lay open.” A patent is granted in exchange for disclosure of the invention to the public. It is therefore based on the doctrine of quid pro quo — the inventor discloses technical knowledge and receives exclusive rights over the invention for a limited duration.
Patent may be defined as a government grant conferring upon an inventor the exclusive right to make, use, sell, or distribute an invention for a specified period. Under Indian law, the duration of a patent is generally twenty years from the date of filing of the patent application.
A patent gives the patentee:
Exclusive monopoly rights over the invention,
Protection against unauthorized use,
Commercial exploitation rights,
Licensing and assignment rights, and
Legal remedies against infringement.
Patent rights are territorial in nature. A patent granted in India is enforceable only within India. Separate patent applications must be filed in other countries to obtain international protection.
The patent system plays a vital role in:
Encouraging scientific research,
Promoting industrial development,
Rewarding inventors,
Facilitating technological disclosure,
Generating investment in innovation, and
Contributing to economic growth.
In Raj Parkash v. Mangat Ram Choudhary, the Court explained the principle of quid pro quo in patent law and held that monopoly rights are granted in return for disclosure of the invention to the public.
Object of Patent Law
The principal object of patent law is to encourage innovation and industrial progress by granting exclusive rights to inventors for a limited period.
Patent law seeks to:
Promote scientific and technological advancement,
Encourage research and development,
Reward inventors for their efforts,
Encourage disclosure of inventions,
Facilitate transfer of technology,
Promote industrialization, and
Ensure public benefit after patent expiry.
The Supreme Court in Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries observed:
“The object of patent law is to encourage scientific research, new technology and industrial progress.”
The Court further emphasized that the monopoly granted under patent law is temporary and that after expiry of the patent term, the invention becomes part of the public domain for the benefit of society.
Patent law therefore strikes a balance between:
Protection of inventors, and
Public access to knowledge and technology.
Meaning of Invention
In ordinary language, invention means the creation of something new through human ingenuity, research, experimentation, and technical skill.
Under Section 2(1)(j) of the Patents Act, 1970:
“Invention means a new product or process involving an inventive step and capable of industrial application.”
The Act also defines “new invention” under Section 2(1)(l) as an invention not anticipated by publication or prior use anywhere in the world before the filing date of the patent application.
For an invention to get a patent under the Patents Act, 1970, it must satisfy certain essential conditions :
Novelty,
Inventive Step,
Industrial Applicability.
Utility
It should not Fall under Sections 3 and 4 of the Act
These are the basic requirements that make an invention eligible for patent protection.
Essentials of a Patentable Invention
The main essentials of a patentable invention are as follows:
1. Novelty (It must be New)
Novelty means that the invention must be completely new. It should not have been known, used, published, or available to the public anywhere in the world before the date of filing the patent application.
In simple words, if the same invention already exists or has been disclosed earlier, it cannot be patented.
The invention should not form part of prior knowledge or public domain.
Example:
If a person invents a new machine that purifies water using a technology never used before, it may be considered novel.
But if the same machine design already exists in books, journals, websites, or has already been used by others, it is not novel.
Novelty is important because patent law rewards only original inventions and not copied or already known ideas.
2. Inventive Step (It must not be Obvious)
An invention must involve an inventive step. This means the invention should not be something that can be easily thought of by a person who has ordinary knowledge in that field.
In simple words, the invention must show creativity and technical improvement beyond ordinary changes.
It should involve:
Technical advancement, or
Economic significance, or
Both.
If the invention is just a small or obvious improvement to an existing product, it will not get patent protection.
Example:
Suppose a mobile phone battery is redesigned in a completely new way that increases battery life by 50%.
This shows inventive step because it is a real technical improvement.
But changing only the colour or shape of the battery without improving performance is obvious and not inventive.
This requirement ensures that patents are granted only for real innovation.
3. Industrial Applicability (It must be Useful in Industry)
The invention must be capable of being made or used in some kind of industry.
This means the invention must have practical usefulness and should be capable of being manufactured or used for industrial or commercial purposes.
An idea that cannot be practically used is not patentable.
Example:
A new machine used in factories to increase production speed has industrial application.
A scientific theory without practical use does not have industrial application.
This condition ensures that patents are granted only for useful inventions that benefit society.
4. Utility (It must be Useful)
The invention must serve some useful purpose. It should work properly and provide practical benefit.
If the invention does not perform any useful function, it cannot be patented.
Example:
A medicine that cures a disease is useful.
A machine that does not work or produces no result is not useful.
Patent law protects inventions that provide real benefit to people or industries.
5. It should not Fall under Sections 3 and 4 of the Act
Even if an invention is new, inventive, and useful, it cannot be patented if it falls under the non-patentable categories mentioned in Sections 3 and 4 of the Patents Act, 1970.
These include:
Frivolous inventions,
Scientific discoveries,
Mathematical methods,
Business methods,
Medical treatment methods,
Traditional knowledge,
Atomic energy inventions.
Example:
A new mathematical formula may be original, but it cannot be patented because law excludes mathematical methods from patentability.
This condition ensures that patents are granted only to legally permitted inventions.
Patentable Inventions
The following types of inventions may generally qualify for patent protection:
New industrial products,
Innovative manufacturing processes,
Technological improvements,
Pharmaceutical inventions,
Mechanical devices,
Chemical compounds,
Electrical inventions,
Biotechnological inventions,
Technical software innovations.
Sections 3 and 4 of the Patents Act, 1970 – Detailed Explanation of Non-Patentable Inventions
The Patents Act, 1970 does not grant patent protection to every invention. Even if an invention is new, useful, and commercially valuable, it may still be excluded from patentability if it falls under Sections 3 or 4 of the Act.
The purpose of these provisions is to:
Prevent misuse of patent monopoly,
Protect public interest and morality,
Ensure free availability of scientific discoveries and traditional knowledge,
Avoid monopolization of natural phenomena and abstract ideas,
Safeguard public health and environment, and
Protect national security.
Sections 3 and 4 therefore act as limitations upon patent rights and specify inventions for which patents cannot be granted.
Section 3 – Inventions Which Are Not Patentable
1. Frivolous Inventions or Inventions Contrary to Natural Laws – Section 3(a)
Section 3(a) states that an invention which is frivolous or which claims anything obviously contrary to well-established natural laws is not patentable.
The term “frivolous invention” refers to inventions lacking scientific credibility or practical utility. Patent law does not protect inventions that violate established principles of physics, chemistry, or nature because such inventions are considered impossible or deceptive.
The rationale behind this provision is that patent protection should be granted only to genuine scientific and technological innovations and not to imaginary or impossible concepts.
Examples:
A machine claiming perpetual motion without energy input,
A device capable of producing unlimited electricity without fuel,
A machine permanently defying gravity.
Such inventions violate scientific principles like the law of conservation of energy and therefore cannot receive patent protection.
2. Inventions Contrary to Public Order or Morality – Section 3(b)
Section 3(b) excludes inventions whose primary or intended use or commercial exploitation:
Is contrary to public order or morality, or
Causes serious prejudice to human, animal, or plant life, health, or environment.
This provision reflects the principle that public welfare is superior to private monopoly rights. Even if an invention is technically advanced, patent protection will not be granted if it threatens society, ethics, health, or ecological balance.
The provision also aligns with the TRIPS Agreement, which permits member countries to deny patents to inventions harmful to morality or public order.
Examples:
Biological weapons,
Chemical weapons,
Human cloning technologies,
Dangerous toxic substances,
Processes harmful to environment,
Devices facilitating illegal activities.
The section ensures that patent law does not encourage inventions dangerous to humanity or nature.
3. Mere Discovery of Scientific Principle or Natural Substance – Section 3(c)
Section 3(c) excludes:
Mere discovery of scientific principles,
Formulation of abstract theories,
Discovery of living or non-living substances occurring in nature.
A discovery differs from an invention. Discoveries merely reveal something already existing in nature, whereas inventions involve human creativity and technical application.
Patent law protects inventions and not discoveries because natural laws and naturally existing substances belong to humanity as a whole.
Examples:
Discovery of gravity,
Discovery of naturally occurring minerals,
Discovery of a naturally existing bacteria,
Discovery of medicinal properties of a naturally existing plant.
However, if a scientific discovery is technically applied in a novel and inventive manner, it may become patentable.
Case Law:
In Mariappan v. A.R. Safiullah, although banana leaf is a natural product, the Court recognized patentable innovation in manufacturing artificial laminated banana leaves having technical and commercial utility.
This case demonstrates that technical application of natural concepts may still qualify for protection.
4. Mere Discovery of New Form or New Property of Known Substance – Section 3(d)
Section 3(d) is one of the most significant provisions under Indian patent law, particularly in pharmaceutical patents.
It states that:
Mere discovery of a new form of a known substance,
Mere discovery of new property or new use of a known substance,
Mere use of known process, machine, or apparatus,
is not patentable unless it results in enhancement of known efficacy.
The objective of this provision is to prevent “evergreening” of patents, where pharmaceutical companies make minor modifications in existing drugs merely to extend monopoly rights without genuine innovation.
The explanation to Section 3(d) clarifies that derivatives such as:
Salts,
Esters,
Polymorphs,
Metabolites,
Isomers,
Complexes,
shall be treated as the same substance unless they significantly differ in efficacy.
Examples:
New crystal form of a medicine without increased therapeutic effect,
New dosage form of known drug without enhanced efficacy,
Slight chemical modification without substantial improvement.
Landmark Case:
In Novartis AG v. Union of India, the Supreme Court denied patent protection to the beta crystalline form of Imatinib Mesylate because enhanced therapeutic efficacy was not proved.
The Court held that mere improvement in physical properties such as better flow or stability is insufficient unless therapeutic efficacy is substantially enhanced.
This judgment became internationally important in protecting affordable access to medicines in India.
5. Mere Admixture – Section 3(e)
Section 3(e) excludes substances obtained by mere admixture resulting only in aggregation of properties of components.
A simple mixture of known substances without any synergistic or technical effect is not considered an invention.
Patent law requires the combination to produce something more than the sum of individual properties.
Examples:
Mixing sugar and water,
Mixing known medicines without new therapeutic effect,
Combining fertilizers without technical improvement.
However, if the combination produces:
Synergistic effect,
Enhanced functionality,
Technical advancement,
it may become patentable.
6. Mere Arrangement or Rearrangement of Known Devices – Section 3(f)
Section 3(f) excludes:
Mere arrangement,
Rearrangement,
Duplication of known devices,
where each device functions independently in its known way.
Patent protection is denied because there is no real inventive ingenuity involved.
Examples:
Pen with attached torch,
Calculator combined with clock,
Mobile holder attached to bottle.
If the devices merely coexist without technical interaction, the invention is not patentable.
However, if the combination creates:
Functional integration,
Technical advancement,
New operational result,
it may become patentable.
7. Methods of Agriculture or Horticulture – Section 3(h)
Section 3(h) excludes methods of agriculture and horticulture from patent protection.
The rationale behind this provision is to:
Protect farmers’ interests,
Prevent monopoly over agricultural practices,
Preserve traditional farming techniques.
Examples:
Method of cultivating rice,
Irrigation techniques,
Plant grafting methods,
Soil treatment methods.
However:
Agricultural machines,
Irrigation equipment,
Genetically modified microorganisms,
may be patentable if they satisfy patentability requirements.
8. Medical Treatment Methods – Section 3(i)
Section 3(i) excludes:
Medicinal,
Surgical,
Curative,
Diagnostic,
Therapeutic methods for treatment of humans or animals.
The purpose is to ensure that doctors and medical professionals can freely treat patients without fear of patent infringement.
Examples:
Surgical procedures,
Cancer therapy methods,
Diagnostic procedures,
Vaccination methods.
However:
Medicines,
Medical devices,
Surgical instruments,
Pharmaceutical compositions,
may still be patentable.
9. Plants and Animals – Section 3(j)
Section 3(j) excludes:
Plants and animals in whole or part,
Seeds,
Species,
Biological processes for production or propagation.
The law prevents monopoly over living organisms and biological life forms.
Examples:
Plant varieties,
Animal breeds,
Seeds,
Naturally occurring biological processes.
However, microorganisms may be patentable because they involve human intervention and industrial application.
This provision balances biotechnology innovation with biodiversity protection.
10. Mathematical Methods, Business Methods and Computer Programmes per se – Section 3(k)
Section 3(k) excludes:
Mathematical methods,
Business methods,
Algorithms,
Computer programmes per se.
The rationale is that abstract intellectual concepts and mental operations are not technological inventions.
Examples:
Accounting methods,
Trading methods,
Mathematical equations,
Standalone software code,
Algorithms without technical application.
However, software involving:
Technical effect,
Hardware integration,
Industrial application,
may sometimes qualify for patent protection.
Case Law:
In Yahoo v. Assistant Controller of Patents, the Court explained the meaning of “per se” and held that inventions involving technical contribution may still be patentable.
Similarly, Astron Clinica Ltd v. Comptroller General of Patents recognized that software producing technical effect may receive patent protection.
11. Literary, Dramatic, Musical or Artistic Works – Section 3(l)
Creative works are not patentable because they are protected under copyright law.
Examples:
Books,
Poems,
Songs,
Paintings,
Films,
Television productions.
Such works are protected under the Copyright Act, 1957.
Patent law protects technical inventions and not artistic creativity.
12. Schemes or Methods for Mental Acts or Games – Section 3(m)
Section 3(m) excludes:
Mental processes,
Rules,
Schemes,
Methods for performing mental acts or games.
Examples:
Chess rules,
Puzzle-solving methods,
Teaching techniques,
Methods of meditation.
These are considered abstract intellectual activities rather than industrial inventions.
13. Presentation of Information – Section 3(n)
Mere presentation of information is not patentable.
Patent law requires technical innovation and not simple display of data or information.
Examples:
Information charts,
Traffic signals displaying information,
Educational displays,
News presentation systems.
14. Topography of Integrated Circuits – Section 3(o)
Layout designs of integrated circuits are excluded because separate legislation protects them.
Examples:
Semiconductor chip layouts,
Integrated circuit configurations.
These are specifically protected under separate intellectual property laws.
15. Traditional Knowledge – Section 3(p)
Section 3(p) excludes inventions which:
Are traditional knowledge, or
Are duplication or aggregation of known properties of traditionally known components.
The objective is to prevent biopiracy and exploitation of indigenous knowledge.
Examples:
Turmeric for wound healing,
Neem medicinal uses,
Traditional Ayurvedic formulations.
India has actively opposed foreign patents based on traditional Indian knowledge through this provision.
Section 4 – Inventions Relating to Atomic Energy
Section 4 provides that no patent shall be granted for inventions relating to atomic energy falling within Section 20 of the Atomic Energy Act, 1962.
The purpose of this provision is to protect:
National security,
Public safety,
Strategic interests of the nation.
Examples:
Nuclear reactor technologies,
Atomic weapon systems,
Sensitive radioactive processes.
Such inventions are excluded because unrestricted private monopoly over atomic energy technology may endanger national interests.
Conclusion
The Patents Act, 1970 plays a crucial role in promoting innovation, industrial growth, and technological advancement in India. A patentable invention must satisfy the essential requirements of novelty, inventive step, industrial applicability, and utility. Patent law rewards inventors with exclusive rights while ensuring eventual public access to technological knowledge.
At the same time, the law carefully excludes certain inventions from patentability under Sections 3 and 4 in order to protect public interest, morality, environment, traditional knowledge, healthcare access, and national security. These exclusions ensure that patents are granted only for genuine technological innovations and not for discoveries, abstract ideas, ordinary improvements, or socially harmful inventions.
Indian patent law therefore maintains a balance between:
Incentivizing innovation, and
Safeguarding public welfare.
The evolving judicial approach through landmark decisions such as Novartis AG v. Union of India and Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries continues to shape the interpretation of patentability in India and strengthen the framework of intellectual property protection.