Patentable and Non-Patentable Inventions

If you have created something new—maybe a device, a process, a software-based solution, or a biotech formulation—you naturally want to protect it. In India, patents give you a legal right to stop others from making, using or selling your invention without permission. But not every idea can get a patent. This guide explains what the law treats as patentable, what is excluded, and how you can think about your invention before you invest time and money.

What does “patent” and “invention” mean in India?

A patent is an exclusive right granted by the Government to the inventor for a limited period (generally 20 years from the filing date). In return, you disclose how your invention works so that society benefits from the knowledge.

Under the Patents Act, 1970, an invention means a new product or process that involves an inventive step and is capable of industrial application. In simple words:

• New (Novelty): No one, anywhere in the world, has publicly disclosed the same thing before your filing date. If it is on a website, in a journal, in a talk, on YouTube, or even in a prior patent—then it is not new.
• Inventive step (Non-obviousness): Your invention should not be an obvious change for a skilled person in that field. There has to be a creative leap or a technical advance, not just routine tinkering.
• Industrial application (Utility): Your invention must be useful and workable in industry. It should solve a real technical problem and be capable of being made or used.

If your work meets all three, you clear the basic gate. But the law still has specific exclusions you must avoid (explained below).

What types of inventions are generally patentable?

India does not maintain a fixed “allowed list”. Instead, if your subject matter meets the three tests above and is not excluded by Sections 3 and 4 of the Act, it is usually patentable. Common patentable categories include:

Product inventions

These include machines, devices, pharmaceutical compounds, chemical compositions and engineered materials. If you have developed a new drug molecule or a new sensor module that improves accuracy, it can be patentable if the core idea is new and non-obvious.

Process inventions

These are methods of making something or achieving a technical result. A new manufacturing method that reduces impurities, or an improved purification process, can be patentable if it delivers a technical effect.

Software-related inventions with technical effect

Pure software “as such” is excluded, but computer-related inventions that show a clear technical contribution—such as better resource scheduling on hardware, improved signal processing, or secure transaction protocols implemented with specific system architecture—can qualify. The claim drafting must highlight the technical effect and tie it to hardware or a practical system.

Biotech and life-science inventions

Genetically engineered microorganisms, vaccine compositions, diagnostics kits with specific technical features, or industrial enzymes may be patentable when they are new, inventive and industrially applicable.

Electronics and telecom

Circuit designs, communication protocols with technical improvements (e.g., lower latency, higher throughput), power-management schemes and sensor fusion methods can be patentable if the claims show measurable technical advantages.

Tip: When you describe your invention, always bring out what problem you solved and how your solution technically improves the prior art. This language helps the examiner see the inventive step clearly.

The three patentability criteria—explained with plain examples

1. Novelty: Suppose you design a new valve geometry that reduces leakage. If a prior research paper already shows the same geometry, you lose novelty. A small cosmetic change will not save you. Keep your invention confidential until you file.
2. Inventive step: If a skilled engineer could combine two known valves from earlier literature in a routine way to reach your design, it will be called obvious. But if your geometry achieves an unexpected performance jump (say, 30% less leakage due to a specific contour you defined and proved), you can argue inventive step.
3. Industrial application: A theoretical equation alone is not enough. You should show that the valve can be made and used in an engine, a pipeline, or a pump system, and that it solves a practical problem.

What cannot be patented in India? (Sections 3 & 4)

Even if something appears new or useful, Sections 3 and 4 list categories that the law excludes from patent protection. Here is a simple, practical tour:

• Frivolous or contrary to natural laws (s.3(a)): Machines that claim perpetual motion or “free energy” are not patentable because they violate physics.
• Against public order or morality; harmful to life or environment (s.3(b)): A device primarily meant to facilitate crime or cause serious prejudice to humans, animals or the environment will be refused.
• Mere discovery of a scientific principle or abstract theory (s.3(c)): You cannot patent Newton’s laws or a mathematical formula itself. You need a technical application.
• Mere discovery of a new form of a known substance without enhanced efficacy (s.3(d)): This is very important in pharma. If you claim a new crystalline form, salt, or polymorph of a known drug, you must demonstrate significantly enhanced therapeutic efficacy, not just better stability or flow. This provision prevents “evergreening”.
• Mere admixture resulting only in aggregation (s.3(e)): Mixing two known chemicals that simply show the sum of their usual properties is not an invention. You must show synergy—the mixture achieves something unexpected and better than the parts.
• Mere arrangement or duplication of known devices (s.3(f)): Putting known tools together in a straightforward way, each working as usual, does not count. There should be a new functional relationship producing a new result.
• Methods of agriculture or horticulture (s.3(h)): Basic cultivation methods are not patentable. However, agri-related compositions (like a novel fungicidal formulation) and machines can be, if they meet the tests.
• Medical, surgical, diagnostic and therapeutic methods for humans/animals (s.3(i)): You cannot patent a method of treatment. This protects doctors’ freedom to treat. Devices, compositions and diagnostic kits may still be patentable; it is the method of treatment that is excluded.
• Plants and animals in whole or any part, and essentially biological processes for their production (s.3(j)): Plant varieties and animal breeds are excluded. India protects plant varieties under a separate law (PPVFR Act). Microorganisms can be patentable if novel and useful.
• Mathematical or business methods or computer programs per se (s.3(k)): Pure business methods or bare algorithms are excluded. But software-linked inventions that produce a technical effect with specific hardware or system architecture can be eligible when claimed correctly.
• Aesthetic creations and works protectable by copyright (s.3(l)): Artistic works, music, films, etc., are not inventions; they are protected, if at all, under the Copyright Act.
• Schemes, rules or methods of mental act or playing a game (s.3(m)): Strategies for chess or mental calculations are not patentable.
• Presentation of information (s.3(n)): Ways of displaying data (tables, dashboards, charts) as such are excluded.
• Topography of integrated circuits (s.3(o)): Protected under a separate law; not through patents.
• Traditional knowledge (s.3(p)): Things long known to communities (like turmeric’s antiseptic properties) cannot be patented.
• Atomic energy-related inventions (Section 4): Inventions falling under the Atomic Energy Act are excluded from patenting.

Practical takeaway: Before you draft claims, check if your core falls into any of these buckets. If yes, you may need to rethink claim strategy (for example, shift from a treatment method to a device or composition; or from a business method to a system with measurable technical effect).

Important case law highlights on patents 

• Novartis AG v. Union of India (2013): The Supreme Court clarified Section 3(d). A new form of a known drug must show enhanced therapeutic efficacy to be patentable. Improved properties like better stability or flow are not enough unless they translate into better therapy. This case is the anchor against evergreening.
  
• Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries (1979): The Court said an improvement over a known device must be more than a workshop variation. It should produce a new result, a better product, or a cheaper article in a non-obvious way.
  
• Computer-related inventions (various Delhi High Court decisions): Courts have repeatedly noted that pure algorithms, business methods, or software per se are excluded. But when you demonstrate a technical effect/technical contribution tied to hardware or system architecture (e.g., resource scheduling, cache management with measurable system gain), you can cross the Section 3(k) hurdle if the claims are drafted to the technical solution.
  
• Agriculture and plant-related inventions: India does not patent plant varieties (Section 3(j)). Instead, plant varieties are protected under the PPVFR Act, which also recognises farmers’ rights to save and use seeds (with limits on branded sales).

These cases and positions give you the practical lens: focus on technical effect, avoid excluded categories, and prove real therapeutic or technical gain where relevant.

Pharma, biotech and Section 3(d): how to think like an examiner

If you work in pharma or biotech, assume that examiners will test your claims against Section 3(d) and inventive step very strictly.

• If your claim is a new form (polymorph/salt) of a known substance, prepare robust comparative data to show enhanced therapeutic efficacy, not just improved physicochemical properties.
• If your claim is a new composition or combination, bring synergy data—for example, better efficacy at lower dose or an unexpected clinical outcome compared to the sum of parts.
• If your claim is a new process, clearly explain the technical advantage—higher yield, fewer impurities, lower energy consumption, or a new intermediate that enables scale-up.

This evidence-first approach improves your chances and saves prosecution time.

Software, AI and business logic: where to draw the line

• Pure algorithms or business flows are excluded.
• You improve your odds when the invention is claimed as a technical system: for example, a method executed by specific modules and hardware that reduces network load by X% or cuts latency by Y ms, proven by experiments.
• Drafting matters. Claims should not read like a business rulebook. They should read like a technical solution to a technical problem with measurable effect.

Practical checklist before you file

Use this short, action-oriented checklist. Each point is a sentence or two to help you decide quickly.

• Confidentiality: Do not disclose your invention publicly before filing. Even your own conference talk or website post can destroy novelty.
• Prior art search: Do a serious search (patents + journals + web). If close art exists, refine your claims to highlight the unique technical advance.
• Problem–solution framing: Write one paragraph stating the problem in the art, the limitations of known methods, and exactly how your solution overcomes them.
• Data, not adjectives: Wherever possible, add test results, benchmarks or comparative tables. Numbers speak louder than adjectives.
• Claim strategy: Avoid excluded matter. For software, emphasise technical features tied to hardware. For pharma, prepare efficacy or synergy proof.
• Industrial applicability: Add a line on where and how it will be used in industry. Show that it is not just theoretical.
• Territorial thinking: Patents are territorial. If you need protection outside India, consider PCT filing timelines and budgets early.

Conclusion

For Indian innovators, the rule of thumb is simple: show genuine technical progress, support it with data, and draft claims that stay away from the exclusions in Sections 3 and 4. If you are in pharma, prepare to meet the Section 3(d) threshold with strong efficacy evidence. If you are in software/AI, articulate the technical effect and system architecture clearly. When you think like an examiner—problem–solution, prior art gaps, measurable advantages—you not only improve your patent’s chances but also build stronger, more defensible IP.