India's patent system is designed to reward genuine invention — but it draws a very deliberate boundary around what is and is not patentable. That boundary is defined primarily by Section 3 of the Patents Act, 1970, which lists an extensive set of exclusions. Understanding these exclusions before you invest time and money into a patent application can save you significant frustration.
This article explains every major category of non-patentable subject matter in India, with practical examples, so you know exactly where your invention stands.
The Three Basic Requirements First
Before we discuss what cannot be patented, it is worth quickly clarifying what can. To be patentable in India, an invention must satisfy three core criteria:
- Novelty: The invention must be new — not disclosed anywhere in the world before the filing date.
- Inventive step: It must not be obvious to a person skilled in the relevant field.
- Industrial applicability: It must be capable of being made or used in some industry.
Even if all three are satisfied, the invention may still be excluded by Section 3. Here is what Section 3 rules out.
Abstract Ideas: Mathematical Methods, Mental Acts and Business Methods
Section 3(k) of the Patents Act, 1970 excludes mathematical or business methods, algorithms and computer programs per se from patentability. This is one of the most frequently invoked exclusions in India, particularly in the technology sector.
A pure algorithm — even a highly sophisticated one — is not patentable in India. Similarly, a business method (a new way of doing business, managing accounts, processing transactions) cannot be patented on its own.
⚠️ Important nuance: The phrase "per se" in Section 3(k) leaves room for software-implemented technical inventions. If your software or algorithm produces a technical effect beyond the computer running it — say, a new method of signal processing or a novel approach to data compression with a measurable technical outcome — it may still be patentable. The Patent Office's guidelines on Computer Related Inventions provide detailed criteria.
Discoveries and Natural Phenomena
Section 3(a) excludes an invention that is frivolous or contrary to natural laws, and Section 3(c) excludes the discovery of a scientific principle, abstract theory, or discovery of any living or non-living substance occurring in nature.
In plain terms: you cannot patent gravity, electricity or a naturally occurring plant extract simply because you were the first to describe it. Discovery and invention are legally distinct. A patent requires that you have created something — not merely found it.
Section 3(d): The Pharma Anti-Evergreening Provision
This is arguably India's most important — and most discussed — patent exclusion. Section 3(d) prohibits granting a patent for a new form of a known substance unless that new form demonstrates significantly enhanced efficacy compared to the known substance.
This provision was specifically designed to prevent pharmaceutical companies from "evergreening" — extending patent protection by making minor modifications to existing drugs (different salt forms, polymorphs, esters, ethers, dosage forms) without any meaningful therapeutic improvement.
The Supreme Court of India upheld this provision in the landmark Novartis AG v. Union of India (2013) case, which concerned the drug Gleevec. The judgment reaffirmed that genuine pharmaceutical innovation is patentable in India, but minor tweaks to prolong monopoly are not.
Methods of Medical Treatment
Section 3(i) excludes any method of treatment of human beings or animals, including surgical, curative, prophylactic, diagnostic, therapeutic or other treatment methods. The rationale is that monopolising a medical treatment method could restrict access to healthcare.
Note the distinction carefully: a device or product used in medical treatment — a surgical instrument, a drug compound, a diagnostic machine — can be patented. It is the method of treatment itself that cannot.
Literary, Artistic and Aesthetic Works
Section 3(b) and Section 3(l) exclude inventions contrary to public order or morality, and literary, dramatic, musical or artistic works or any other aesthetic creation including cinematographic works. These are protected by copyright, not patents.
Traditional Knowledge
Section 3(p) explicitly excludes inventions that are traditional knowledge or aggregation or duplication of known properties of traditionally known components. India has the world's largest Traditional Knowledge Digital Library (TKDL), a database used by patent offices worldwide to identify and reject patent applications that claim traditional Indian knowledge as novel invention.
Atomic Energy Inventions
Section 4 of the Patents Act separately prohibits patents for inventions relating to atomic energy. This is an absolute prohibition, not subject to any exception.
Quick Reference Checklist
| Category | Section | Can Be Patented? |
|---|---|---|
| New product / process | — | ✅ Yes (if novel, non-obvious) |
| Algorithm / business method | 3(k) | ❌ No (unless technical effect) |
| Mathematical method | 3(k) | ❌ No |
| Discovery of natural substance | 3(c) | ❌ No |
| New form of known drug (no efficacy gain) | 3(d) | ❌ No |
| Method of medical treatment | 3(i) | ❌ No |
| Literary or artistic work | 3(l) | ❌ No (use copyright) |
| Traditional knowledge | 3(p) | ❌ No |
| Atomic energy invention | Sec 4 | ❌ No (absolute) |
| Novel drug formulation (genuine efficacy) | — | ✅ Yes |
| New manufacturing process | — | ✅ Yes |
| Medical device / diagnostic tool | — | ✅ Yes |
What to Do Before Filing
Before investing in a patent application in India, have an IP specialist review your invention against the Section 3 exclusions. Many applicants discover only after paying filing fees — or after the application is rejected — that their invention falls within an excluded category. A short prior consultation can save months of wasted effort.
If your invention does qualify, act quickly: any public disclosure before filing (a conference presentation, a product launch, a paper published) destroys novelty and makes the invention unpatentable. Learn about our patent registration services → or read more articles on the IP Law Blog.
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