Understanding Patent Infringement: Definitions and Implications

A patent grants its holder something valuable: a temporary, government-backed monopoly over an invention. In exchange for publicly disclosing the invention, the law gives the patentee exclusive control over how it is made, used, and commercialized. When someone steps into that protected space without permission, they commit what the law calls patent infringement. It is, at its core, an unauthorized intrusion into rights that the state has formally recognized and protected. Understanding precisely what counts as infringement – and how different legal systems define it – is foundational to any serious study of patent law.

What patent infringement means 🔗

Patent infringement, in general terms, refers to any act by a third party that violates the exclusive rights conferred upon the holder of a valid patent, without that holder’s consent. The violation does not require intent – it is largely a strict liability civil wrong. A competitor who independently arrives at the same invention and begins selling it still infringes, even if they had no idea the patent existed.

The concept is closely tied to the idea of patent rights as a form of property. Just as trespassing on someone’s land is actionable regardless of the trespasser’s motive, commercially exploiting a patented invention without authorization is actionable regardless of how the infringer came to do it. Patent infringement undermines the rights of inventors and discourages innovation, which is why legal systems worldwide treat it seriously.

The Indian position: Section 48 of the Patents Act, 1970 🔗

India’s primary legislation on patents is the Patents Act, 1970. Notably, the Act does not contain an explicit, standalone definition of “infringement.” This is not an oversight – it is a deliberate legislative approach. Instead of defining infringement directly, the Act defines the rights of the patentee, and infringement is then understood as any violation of those rights.

Section 48 of the Patents Act, 1970 confers exclusive rights upon the patentee to prevent third parties from making, using, offering for sale, selling, or importing the patented invention – whether it is a product or a process – without the patentee’s consent. Any commercial act that cuts across these rights, without permission, constitutes infringement. The logic is that the scope of infringement is the mirror image of the scope of patent rights: whatever the patentee has the exclusive right to do, an unauthorized party is prohibited from doing.

This approach means that the first analytical step in any infringement dispute under Indian law is to identify what rights have been granted by the patent, and then to determine whether the alleged infringer’s conduct falls within those rights. Section 48 grants the patent holder exclusive rights including control over the making, using, offering for sale, selling, or importing of the patented product, and patent holders can take legal action against unauthorized third parties who infringe these rights.

Product patents vs. process patents 🔗

The distinction between a product patent and a process patent is critical when determining infringement under Indian law. A product patent protects the invention itself – the physical product – regardless of how it is manufactured. Anyone who makes, sells, uses, or imports that product without consent infringes, full stop.

A process patent, on the other hand, protects the method or process of creating something. Infringement here includes not just using the patented process itself, but also using, offering for sale, selling, or importing a product that was directly obtained by that process. The two categories of infringing activities under the Patents Act, read with Section 48, are: making, using, offering for sale, selling, or importing the patented product; and using the patented process or using, offering for sale, selling, or importing the product directly obtained by that process.

The UK definition: Section 60 of the Patents Act, 1977 🔗

Unlike India, the United Kingdom has codified the meaning of infringement explicitly. Section 60(1) of the UK Patents Act, 1977 provides that a person infringes a patent if, while it is in force, they do any of the listed acts in the UK without the consent of the proprietor. For product inventions, this includes making, disposing of, offering to dispose of, using, importing, or keeping the product. For process inventions, it includes using the process or offering it for use, as well as disposing of, using, or importing products obtained directly through that process.

The UK Act goes a step further by also addressing indirect or contributory infringement under Section 60(2). A person indirectly infringes a patent where they supply or offer to supply the means relating to an essential element of the patented invention for putting the invention into effect, knowing that those means are suitable and intended to be used in that way. This provision captures situations where someone does not directly infringe a patent but knowingly enables another party to do so.

The UK framing is more granular than India’s because it expressly defines both the act of infringement and its limits in a single section, making the analysis more structured for courts and practitioners.

The US definition: 35 U.S.C. § 271 🔗

The United States provides the most direct statutory definition among the three jurisdictions. Under 35 U.S.C. § 271(a), whoever without authority makes, uses, offers to sell, or sells any patented invention within the United States, or imports such an invention into the United States during the term of the patent, infringes the patent. Section 271(b) further provides that whoever actively induces infringement of a patent shall also be liable as an infringer.

The US statute is notable for its clarity: it directly equates unauthorized acts with infringement, rather than working backwards from a list of exclusive rights as Indian law does. The practical outcome, however, is largely the same – any unauthorized commercial engagement with a patented invention during the patent term is actionable.

A comparative reading: what these definitions share 🔗

Despite the different drafting approaches, the Indian, UK, and US frameworks share a common core. All three systems recognize that infringement occurs when a person, without authorization, engages in any of the following acts in relation to a patented invention during the patent’s term:

Making – manufacturing the patented product or using the patented process. Using – commercially deploying the invention. Selling or offering for sale – placing the invention in commerce, even if no sale is completed. Importing – bringing the patented product into the jurisdiction. These acts are consistently treated across all three systems as the boundaries of the patentee’s exclusive domain. Any unauthorized entry into this domain is infringement, regardless of the infringer’s knowledge or intent.

The key differentiator is how each system handles indirect or contributory infringement. The UK and US codes explicitly address it by statute. India’s approach is less codified on this front, though courts have recognized indirect infringement through judicial interpretation, including the doctrine of equivalents, which classifies even a minor change to a product as infringement if it performs substantially the same function in the same way to produce the same result.

Why the absence of an explicit definition in Indian law matters 🔗

The fact that the Patents Act, 1970 does not define “infringement” explicitly has practical consequences. It places a heavier interpretive burden on courts, which must determine the scope of infringement by examining the rights conferred under Section 48 and the claims set out in the patent specification. The patent claims – the written description of the protected invention’s scope – become the primary reference point in any infringement analysis.

It also means that the boundary between infringement and non-infringement in India is shaped significantly by case law and judicial interpretation. Doctrines like the doctrine of equivalents and literal infringement have developed through court decisions rather than legislative definition. As per Section 104(A) of the Patents Act, 1970, in infringement suits involving a patented process, where it is substantially likely that an identical product is made by the patented process and the patentee cannot determine the process used by the infringer through reasonable efforts, the court may direct the defendant to prove that their process is different – a reversal of the usual burden of proof that reflects how seriously the law takes process patent protection.

The role of consent and commercial purpose 🔗

Two elements are central to any finding of infringement: the absence of consent from the patentee, and typically a commercial purpose behind the unauthorized act. A patentee can license their invention – either exclusively or non-exclusively – and such authorization completely removes the activity from the definition of infringement. This is why licensing agreements are commercially significant: they convert what would otherwise be infringement into lawful use.

Equally, certain non-commercial uses are carved out by statute and do not constitute infringement. Section 47(3) of the Patents Act, 1970 permits any person to use or make the patented invention merely for the purposes of experiment or research, including for imparting instructions to students – but selling the patented product for experimental purposes falls outside this exemption and would still constitute infringement. The key dividing line, in most cases, is commercial exploitation without authorization.

Infringement as unlawful trespass into protected IP space 🔗

Perhaps the clearest way to understand patent infringement conceptually is through the lens of property law. A patent creates a legally defined territory – a set of exclusive rights over a specific invention for a limited period. When any person without authority enters that territory by making, using, selling, or importing the invention, they commit what is functionally an unlawful trespass into the patentee’s intellectual property domain.

This framing is not merely metaphorical. It explains why patent infringement is a civil wrong actionable in court, why it requires no proof of intent, and why the remedy is typically compensatory (damages or account of profits) and preventive (injunction). Section 108 of the Patents Act, 1970 deals with reliefs in suits for infringement, and remedies include injunctions, damages, and account of profits – all aimed at restoring the patentee to the position they would have been in but for the unauthorized use.

The TRIPS Agreement – to which India is bound as a WTO member – reinforces this framework at the international level. It mandates that member states provide enforcement mechanisms sufficient to deter infringement and provides minimum standards for remedies, ensuring that patent protection is not merely nominal but practically enforceable.

What do you think? Given that India’s Patents Act, 1970 does not explicitly define infringement but instead works through the rights of the patentee under Section 48, do you think this indirect approach creates more legal uncertainty than a direct statutory definition would? And considering that consent transforms infringement into lawful use, how should Indian courts determine whether consent was given in the absence of a formal written license?

References

1. https://depenning.com/blog/patent-infringement-in-india-recent-case-studies-and-legal-updates/
2. https://ipindia.gov.in/writereaddata/portal/ipoact/1_31_1_patent-act-1970-11march2015.pdf
3. https://www.mondaq.com/india/patent/930048/patent-infringement-what-is-infringement-what-is-not
4. https://www.ezylegal.in/blogs/patent-infringement
5. https://blog.ipleaders.in/concept-patent-infringement/
6. https://www.gov.uk/guidance/the-patent-act-1977/section-60-meaning-of-infringement
7. https://www.hg.org/legal-articles/patent-infringement-considerations-in-determining-if-there-is-infringement-in-the-uk-36666
8. https://www.law.cornell.edu/uscode/text/35/271
9. https://blog.ipleaders.in/an-overview-of-the-patent-infringements-and-remedies-available-in-india/
10. https://ssrana.in/ip-laws/patents/patent-infringement-india/