A patent does not have to make a physical product. A technical method — even one that outputs a controlled process rather than a thing — is patentable, and the Patent Office cannot reject it as a “mere scheme” under Section 3(m). The Madras High Court said so in a Robert Bosch appeal.
The case
Robert Bosch Limited appealed the refusal of Indian Patent Application No. 201944047460 — “Method of Preheating and Controlling the Temperature of Fuel Injected into a Combustion Engine.” The Deputy Controller had refused it under Section 3(m) of the Patents Act, 1970.
Notably, the FER (Oct 2020) and the hearing notice (Jan 2023) had raised novelty and inventive step — not Section 3(m). Yet the refusal (Aug 2023) rested solely on Section 3(m).
The arguments
- Bosch: the invention was “not a mere abstract idea or mental act but involved a specific and detailed method with real-world application,” using hardware — fuel-heating devices, sensors, control units — so it was a technical process, not theory.
- Patent Office: the method made no tangible product and resembled a scheme or instruction manual, excluded by Section 3(m).
What the court held
Section 3(m) excludes “a mere scheme or rule or method of performing a mental act or method of playing a game.” Examining claim 1 — measuring ambient and fuel temperatures, calculating required heating power, applying it via control units, and adjusting — the court found “a well-defined sequence of operations executed through a combination of sensors, controllers, and heating units.”
Crucially, accepting the Office’s reading “would exclude all process or method claims,” which contradicts the Act’s scheme of allowing both product and process patents. So a technical method need not yield a physical product to be patentable.
The court also flagged a natural-justice breach: refusing on Section 3(m) without ever putting that ground to the applicant. It remanded the matter — a different officer, reconsideration only on the earlier inventive-step objection (not 3(m)), a reasoned decision within four months, and a fair hearing.
Case: Robert Bosch Ltd. v. Deputy Controller of Patents and Designs, CMA(PT)/1/2024, Madras High Court, Justice Senthilkumar Ramamoorthy, 25 March 2025.
The takeaways
- Process/method inventions are patentable — Section 3(m) targets abstract schemes and mental acts, not technical methods run through hardware.
- No physical-product requirement. Producing a controlled outcome, not a thing, does not defeat patentability.
- Grounds must be put to you. Refusing on a ground never raised in examination or the hearing breaches natural justice.
Frequently asked questions
Must a patent produce a physical product in India? No. The Madras High Court held a technical method executed through sensors and controllers is patentable even without a tangible product.
What does Section 3(m) exclude? Mere schemes or rules, and methods of performing a mental act or playing a game — not technical processes with real-world application.
Why did the court fault the refusal? Because the Office refused under Section 3(m) — a ground never raised in the FER or hearing — breaching natural justice.
What happened to the application? It was remanded to a different officer to reconsider only the earlier inventive-step objection, with a reasoned decision within four months.
Legislation referred to
- The Patents Act, 1970