Fresenius Kabi v. Controller: Delhi HC Voids Patent Refusal

What Was the Dispute?

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The appellant, Fresenius Kabi Ipsum SRL, sought to patent an improved process for the preparation of sugammadex, specifically employing an isolated di-alkali metal salt of 3-mercaptopropionic acid. The patent application, filed on 22 March 2016, aimed to address deficiencies in existing industrial processes, such as the use of hazardous reagents like sodium hydride, unsatisfactory purity levels, and excessively long reaction times. The appellant contended that isolating the salt before the reaction represents a distinct, stable chemical improvement over prior art methods that rely on in situ generation of the salt.

The Assistant Controller of Patents and Designs (Respondent No. 1) refused the application following a pre-grant opposition filed by Respondent No. 2. The refusal was grounded in claims of lack of novelty (Section 25(1)(b) of the Patents Act, 1970, which covers opposition on grounds of anticipation by prior art), lack of inventive step (Section 25(1)(e), covering lack of inventive merit over prior art), and non-patentability under Section 3(d) (which prevents the mere discovery of a new form of a known substance which does not result in the enhancement of the known efficacy of that substance). The appellant challenged this decision before the Delhi High Court, asserting both procedural infirmities and substantive errors in the Controller’s technical assessment.

What Questions Did the Court Consider?

The appeal presented two primary tiers of inquiry: procedural legitimacy and technical merits.

• Procedural Compliance: Did the Controller violate mandatory procedural requirements by failing to grant a separate hearing under Section 14 of the Patents Act, 1970 (which mandates that the Controller provide an applicant an opportunity to be heard when an examiner’s report is adverse)? The appellant argued that this statutory duty is independent of any hearing granted during the pre-grant opposition process under Section 25(1) (which allows any person to oppose a patent grant).
• Compliance with Natural Justice: Was the impugned order legally sustainable if it failed to provide reasons for rejecting the appellant’s technical evidence, particularly regarding the purported improvement in purity and reaction time?
• Substantive Patentability: Did the Controller err in law by treating the use of an “isolated salt” as an obvious modification of the “in situ salt” method disclosed in prior art (D1), and did the Controller ignore the requirement to assess novelty and inventive step without hindsight bias?

What Did the Court Hold?

The Court scrutinized the interplay between the examination process under Chapter IV of the Patents Act and the opposition process under Chapter V. The judgment reinforces that these are distinct statutory workflows. Following precedents such as Novartis AG v. Natco Pharma Limited and Zydus Healthcare Ltd. v. Assistant Controller of Patents and Designs, the Court affirmed that the opportunity of being heard under Section 14 is a mandatory procedural safeguard. The Controller cannot consolidate the examination of the patent application into the pre-grant opposition hearing to circumvent the specific obligations of Section 14. The failure to grant a separate hearing under Section 14 constitutes a procedural illegality that vitiates the order.

Furthermore, the Court addressed the quality of the order itself. A patent refusal must be a speaking order, meaning it must specifically engage with the technical submissions made by the applicant. The Controller failed to adequately analyze:

• The distinction between implicit and explicit disclosure in the context of novelty.
• The specific technical advancements (such as reduced impurity and reaction efficiency) claimed by the appellant.
• The reasons why a person skilled in the art would, without hindsight, arrive at the “isolated salt” method as a mere workshop improvement from the D1 prior art.

The Court noted that the Controller’s assertion, that providing a hearing would not have changed the outcome, is legally untenable. Statutory safeguards are not optional based on the Controller’s post-facto evaluation of their likely impact. Consequently, the order of refusal dated 21.11.2024 was set aside. The matter was remanded to the Controller for a fresh consideration, with the express instruction to provide the appellant a proper hearing under Section 14 and to pass a , reasoned order that addresses the technical data and arguments presented.

Also Read: Calcutta HC Revokes Letters Patent Leave in Maitra Servicenter Dispute

Why Does the Decision Matter?

This decision provides critical clarity for practitioners regarding the independence of patent examination procedures. It reiterates that the right to a hearing under Section 14 of the Patents Act is a core statutory protection. For law students and practitioners, the case underscores that the Controller’s discretion under the Act is bounded by specific procedural obligations that cannot be substituted by general proceedings like those under Section 25(1).

For IP lawyers, the judgment serves as a reminder of the standards for “speaking orders.” If the Patent Office rejects an application, it must provide a structured analysis that identifies the closest prior art, defines the technical problem, and explains why the applicant’s invention fails the test for inventive step without resorting to hindsight reconstruction. By rejecting the “in situ vs. isolated” equivalence as an obvious modification without evidence, the Court has signaled that the Patent Office must engage meaningfully with the chemical nuances and experimental data provided by inventors. This decision discourages the use of shortcuts in patent adjudication and ensures that the rigorous requirements of the 1970 Act are met in every refusal.

Finally, the case emphasizes the necessity of maintaining a separation between the opposition proceedings (involving a third party) and the examination proceedings (involving the applicant and the Controller). By preventing the convergence of these two distinct streams, the Court protects the applicant’s right to defend their patent application directly before the decision-maker, ensuring that the process remains transparent and compliant with the principles of natural justice.