Unlocking the Inventive Step: The Heart of Patentable Innovation

Not every new idea deserves a patent. The patent system is designed to reward genuine innovation – inventions that push the boundaries of existing knowledge, not those that simply tinker with what is already known. At the heart of this filtering mechanism is a legal concept called the inventive step. Under Indian patent law, an invention cannot be patented merely because it is new. It must also clear the inventive step hurdle – meaning it must represent a meaningful leap forward that a person working in that field would not have arrived at on their own. Understanding what this means, and how it is evaluated, is essential for anyone serious about intellectual property law.

The legal definition under the Patents Act, 1970 🔗

Section 2(1)(j) of the Patents Act, 1970 defines an “invention” as a new product or process that involves an inventive step and is capable of industrial application. The specific definition of “inventive step” is found in Section 2(1)(ja), which was inserted by the Patents (Amendment) Act, 2005. It 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 rests on three pillars: technical advancement, economic significance, and non-obviousness. An invention needs to satisfy either the first or the second condition – or both – along with the non-obviousness requirement. Each of these elements has significant implications for how a patent application is assessed.

Technical advancement 🔗

Technical advancement means the invention contributes something new to the existing state of knowledge in a particular field of technology. It is not enough for an invention to be different – the difference must represent a genuine forward movement in technical capability. The Indian Patent Office (IPO) interprets technical advancement as a contribution to the state of the art that comes with a concrete technical effect – meaning the invention must solve a real technical problem in a way that the prior art did not.

In practice, examiners look at what was publicly known or used before the filing date – collectively referred to as “prior art” – and assess whether the invention goes meaningfully beyond it. If the claimed invention is simply a predictable modification or routine application of existing techniques, it will not clear this bar. The key question is whether the advancement is substantive, not cosmetic.

Economic significance 🔗

One of the distinctive features of Indian patent law, compared to jurisdictions like the United States or the United Kingdom, is its explicit recognition of economic significance as an independent alternative to technical advancement. Scholars at IIT Kharagpur’s Rajiv Gandhi School of Intellectual Property Law have pointed out that the Indian statute places economic significance alongside technical advancement without necessarily requiring both – making the Indian framework somewhat unique at the international level.

This raises an interesting question: can an invention with negligible technical novelty but substantial commercial value still pass the inventive step test? The law, as worded, seems to leave that door open. However, courts and the IPO have generally treated economic significance as a complementary factor rather than a standalone gateway, applying it cautiously to prevent the patent system from rewarding purely commercial cleverness over genuine innovation.

Non-obviousness: the real test 🔗

The most contested and legally complex element of the inventive step is non-obviousness. An invention is obvious if a person skilled in the relevant field, with full knowledge of the prior art, could have arrived at the same invention without exercising any inventive ingenuity. If such a person could have gotten there through ordinary skill and routine experimentation, the invention lacks an inventive step.

The “person skilled in the art” (PSITA) is a legal construct – a hypothetical expert who knows everything in the field up to the priority date but has no special creative ability. Indian law does not prefix “ordinary” before “skilled”, unlike U.S. law which refers to a “Person Having Ordinary Skill in the Art” (PHOSITA). This subtle difference has led to interpretive debates, with courts generally treating the Indian PSITA as a competent craftsman or skilled worker – someone with technical know-how but no inventive spark of their own.

A key concern during this assessment is hindsight bias – the tendency to look back at an invention and conclude it was obvious simply because we now know the solution. Courts in India have recognised that patent examiners must be careful not to use the invention itself as a roadmap when assessing whether it was obvious from prior art. The evaluation must be conducted from the perspective of the skilled person who did not know the invention at the time.

How the inventive step is evaluated: the four-step framework 🔗

Indian courts, drawing on international approaches, have adopted a structured method to assess inventive step. The Delhi High Court, in F. Hoffmann-La Roche & Ors. v. Cipla Ltd., laid down a four-step framework that examiners and courts rely on:

Step 1 – Identify the scope of the claimed invention and construe it properly.

Step 2 – Identify the differences between the claimed invention and the closest prior art.

Step 3 – Assess whether those differences constitute steps that would have been obvious to a person skilled in the art.

Step 4 – Rule out hindsight – ensure the analysis is done without using knowledge of the alleged invention as a guide.

Courts have also emphasised that this assessment must be conducted holistically. Fragmentary analysis of individual claim elements – where each element is assessed in isolation and declared obvious – is not a valid approach. The invention must be considered as a whole, and the examiner must explain specifically how and why the prior art would lead a skilled person to the claimed invention.

Landmark case: Bishwanath Prasad Radhey Shyam v. Hindustan Metal Industries (1978) 🔗

No discussion of the inventive step in India is complete without this Supreme Court judgment, which remains the foundational authority on the subject even today. The dispute involved a patent for a device and method for mounting metallic utensils on a lathe. The patentee claimed the invention improved the safety and efficiency of the manufacturing process at Mirzapur.

The Supreme Court held that for an invention to be patentable, an improvement on something previously known must be more than a mere workshop improvement. It cannot be the obvious or natural suggestion of what was already publicly known. Further, simply combining known elements in a predictable way – what the Court called “mere collocation” – does not qualify as an inventive step if no new result or improved outcome is produced through their interaction.

The Court found that the patented method was essentially an application of techniques already known for decades. It lacked both novelty and inventive step, and the patent was accordingly revoked. The principles from this 1978 ruling were later codified into the Patents Act and continue to guide Indian patent examination and litigation to this day.

The Novartis case and economic significance under Section 3(d) 🔗

The Novartis v. Union of India case brought the inventive step discussion into global focus. Novartis sought a patent for a modified (beta crystalline) form of Imatinib Mesylate, a drug used to treat chronic myeloid leukemia, marketed as Gleevec. The Supreme Court rejected the patent application, holding that the modified form did not demonstrate significantly enhanced efficacy over the known compound.

The Court’s analysis engaged closely with Section 3(d) of the Patents Act, which prevents patenting of new forms of known substances unless enhanced efficacy is demonstrated. Read alongside the inventive step requirement, this case underscores that India’s patent framework is designed to prevent “evergreening” – the practice of securing fresh patents on minor modifications to extend market exclusivity. Economic significance, in this context, cannot substitute for genuine technical progress.

Grounds for opposition and revocation based on lack of inventive step 🔗

The legal consequences of failing the inventive step test are significant. A lack of inventive step is a valid ground for pre-grant opposition under Section 25(1)(e) and post-grant opposition under Section 25(2)(e) of the Patents Act. It is also a ground for revocation of an already-granted patent under Section 64(1)(f). This means that even after a patent is granted, a third party can challenge it by establishing that the invention was obvious at the time of filing. This keeps the system honest – patents are not self-validating, and the inventive step requirement can be invoked throughout the life of a patent.

Practical implications for patent applicants 🔗

For inventors and legal practitioners, understanding how the inventive step is evaluated has direct practical consequences. A well-drafted patent specification should clearly identify the technical problem the invention solves, articulate how it differs from prior art, and provide a comparative analysis showing why those differences are non-obvious. Relying solely on the novelty of the invention is not enough – the specification must build a case for inventiveness.

It is also common for the IPO to combine multiple prior art documents and argue that their combination renders the invention obvious. Applicants must be prepared to show why combining those documents would not have been a natural step for a skilled person, and how the invention as a whole achieves something that the prior art – even taken together – did not teach or suggest. The time gap between prior art documents and the claimed invention is also a factor the Delhi High Court has recognised as relevant in the inventive step analysis.

What do you think? If an invention is commercially groundbreaking but builds entirely on well-known techniques, should economic significance alone be enough to satisfy the inventive step requirement under Indian law? And how should courts and patent examiners guard against hindsight bias when assessing whether an invention was truly non-obvious at the time it was made?

References

1. https://www.indiaip.com/india/patent/faq
2. https://stratjuris.com/decoding-inventive-step-for-patents-in-india/
3. https://www.iam-media.com/article/the-concept-of-inventive-step-in-india
4. https://or.niscpr.res.in/index.php/JIPR/article/view/1887
5. https://www.lexology.com/library/detail.aspx?g=799ebc9c-8bd7-4f00-8f6c-bb68fe11c7a3
6. https://www.lexology.com/library/detail.aspx?g=97182c18-7660-4824-8c9a-fb3eebe41840
7. https://www.bananaip.com/intellepedia/inventive-step-jurisprudence-indian-patent-act-bishwanath-prasad/
8. https://indiankanoon.org/doc/1905157/
9. https://www.invntree.com/blogs/determination-obviousnessinventive-step-indian-approach
10. https://www.lakshmisri.com/Media/Uploads/Documents/L&SWebsite_IPR_Featured_Ranjan.pdf
11. https://www.iam-media.com/guide/india-managing-the-ip-lifecycle/2024/article/overcoming-the-inventiveness-barrier-patentability