Madras HC Sets Aside Kobelco Patent Refusal in Prior Art Dispute

In KOBELCO COMPRESSORS CORPORATION Vs ASSISTANT CONTROLLER OF PATENTS AND DESIGNS [CMA(PT).26/2024], the Madras High Court set aside the administrative refusal order passed by the Assistant Controller of Patents and Designs, which had rejected Japanese applicant Kobelco Compressors Corporation’s patent application for a “SOUND INSULATING PACKAGE”. Adjudicating a statutory appeal under Section 117-A of the Patents Act, 1970, Justice P.B. Balaji held that administrative orders rejecting patent claims under Section 2(1)(ja) for an alleged lack of inventive step without detailed technical comparative analysis, structured reasoning, or meaningful engagement with the applicant’s written responses are unsustainable in law. The High Court remitted the matter for fresh examination before a different Patent Controller to eliminate administrative confirmation bias, directing that the de novo prosecution be completed within a strict timeline of four months.

Quasi-Judicial Imperatives and Administrative Arbitrariness in Patent Office Rejections

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The refusal of patent applications through unreasoned summary administrative orders represents a systemic challenge within the Indian Intellectual Property Office (IPO). Under Section 15 of the Patents Act, 1970, the Controller of Patents does not function as a mere administrative bureaucrat but exercises quasi-judicial authority when determining whether an invention meets statutory patentability criteria. Quasi-judicial decision making requires adherence to the principles of natural justice and constitutional guarantees under Article 14 of the Constitution of India. Central to administrative propriety is the obligation to pass a reasoned speaking order. A reasoned order serves as an essential safeguard against arbitrary exercise of power, ensuring that the decision maker applies their mind to the material on record and enables effective judicial review by appellate courts.

In Indian patent prosecution, examination reports and final refusal orders frequently suffer from a fatal flaw: Controllers cite prior art references alongside the applicant’s patent claims but omit the technical analysis necessary to demonstrate why a person skilled in the art would consider the claimed advance obvious. The decision in Kobelco Compressors Corporation v. Assistant Controller of Patents and Designs directly addresses this administrative defect. Kobelco Compressors Corporation challenged the Assistant Controller’s refusal of Patent Application No. 202147013337 regarding a “SOUND INSULATING PACKAGE”. The Assistant Controller rejected the application on two procedural and substantive grounds: an alleged lack of inventive step under Section 2(1)(ja) of the Patents Act, 1970, and the failure of the applicant to format claims in a traditional two-part structure.

Appearing for the Appellant, advocate Mr. Rahul Balaji submitted that the Patent Office failed to adhere to the mandatory judicial guidelines governing inventive step analysis established by the Delhi High Court in F. Hoffmann-La Roche Ltd. v. Cipla Limited. He argued that the refusal order was unreasoned and requested a remand for fresh prosecution. He further requested that re-examination be assigned to a different Patent Controller to ensure an unbiased evaluation. Conversely, Senior Panel Counsel Mr. K.R. Samratt, representing the Patent Office, defended the refusal order by arguing that the claimed sound insulating package offered no technical advancement over prior art citations D1, D3, and D7. Relying on decisions such as Lallubhai Chakubhai v. Chimanlal and Co. and Gogoro Inc. v. Controller of Patents and Designs, the Respondent asserted that the inventive features were obvious to a person skilled in the art and that the refusal order was legally sound.

The Doctrinal Test for Inventive Step: Deconstructing Section 2(1)(ja) and the Hoffmann-La Roche Framework

Evaluating an inventive step under Section 2(1)(ja) of the Patents Act, 1970, demands an objective evaluation rather than subjective summary conclusions. The statutory definition requires an invention to demonstrate either technical advance over existing knowledge, economic significance, or both, while remaining non-obvious to a Person Skilled in the Art (PSITA). To prevent examiners from relying on subjective opinions or engaging in impermissible hindsight analysis, Indian jurisprudence enforces the structured five-step obviousness test set out in F. Hoffmann-La Roche Ltd. and another v. Cipla Limited [2016 (65) PTC 1 (Del)].

This test requires the Patent Controller to establish a systematic evidentiary chain: first, identify the specific inventive concept embodied in the patent application; second, define the scope of common general knowledge attributed to the PSITA at the priority date; third, analyze the disclosures contained in the cited prior art documents; fourth, identify the structural, technical, or functional differences between the cited prior art and the patent claims; and fifth, determine whether those differences would have been obvious to the PSITA without relying on the benefit of hindsight. In the present prosecution, the Assistant Controller bypassed this framework entirely. Rather than demonstrating how prior art references D1, D3, and D7 disclosed or rendered obvious the acoustic configuration of Kobelco’s sound insulating package, the Controller issued a conclusory order.

Reviewing the administrative record, the High Court observed that setting out prior art citations next to patent claims does not satisfy the legal requirement for determining obviousness. Emphasizing the duty of the Patent Office to issue reasoned orders, Justice P.B. Balaji highlighted the total absence of analytical discussion in the impugned order:

At the outset, as rightly contended by Mr.Rahul Balaji, counsel for the Appellant, on going through the impugned order, I do not find any discussion whatsoever to reject the application of the Appellant and reasons are also lacking. Mere reference to prior arts and the invention claimed by the Appellant alone would not suffice.

Hon’ble Mr. Justice P.B. Balaji, Madras High Court

By enforcing strict adherence to the Hoffmann-La Roche doctrinal framework, the High Court established that a valid refusal order must contain an explicit comparative analysis demonstrating why the claimed advance is obvious to a PSITA. This prevents examiners from relying on generic assertions of public knowledge.

Judicial Precedent and Evidentiary Forensics: Mandatory Standards for Analyzing Prior Art

The decision in Kobelco Compressors reinforces a clear body of jurisprudence from the Madras High Court regarding administrative orders in patent prosecution. Justice P.B. Balaji drew directly upon his earlier decision in Cornell Research Foundation Inc. v. Assistant Controller of Patents and Designs [(T) CMA (PT) No. 187 of 2023], where the Court held that when a Patent Controller fails to assign reasons and omits discussion regarding the applicant’s written responses to a hearing notice, the applicant is entitled to an order of remand. An examination process that ignores the applicant’s submissions violates natural justice and invalidates the resulting order.

Furthermore, the High Court relied upon Pinnacle Engines Inc. and another v. Assistant Controller of Patents and Designs [2024 SCC OnLine Mad 1052] to affirm that listing elements of a claim alongside prior art features does not fulfill the legal requirements of an inventive step inquiry. Reaffirming this standard, Justice P.B. Balaji noted:

In Pinnacle Engines Inc. and another v. Assistant Controller of Patents and Designs, reported in 2024 SCC Online Mad 1052, this Court found that when the Controller had merely set out the various elements of the claimed invention, without any discussion on the claimed invention, the order is unsustainable on the ground that it is effectively unreasoned.

Hon’ble Mr. Justice P.B. Balaji, Madras High Court

From an evidentiary perspective, an administrative order refusing a patent must contain specific factual findings. The Patent Controller must evaluate the written submissions offered by the applicant during the post-hearing stage, address technical affidavits or comparative data submitted to demonstrate technical superiority, and explain why such evidence fails to overcome the cited prior art. When an order lacks these fundamental elements, it violates the duty to act judicially, rendering the decision void under administrative law principles.

The High Court also addressed the Assistant Controller’s rejection of the application for failing to use a two-part claim format. Under Indian patent practice and International Searching Authority standards, while a two-part claim format comprising a preamble and a characterizing portion is preferred in certain mechanical arts, it is not an absolute statutory requirement under the Patents Act, 1970, or the Patent Rules, 2003. Where an invention resides in a novel combination of old elements or an integrated structural configuration, requiring a rigid two-part claim format can obscure the scope of protection. Rejecting an application on formalistic formatting grounds without evaluating the substantive merits of the claims constitutes an improper exercise of administrative discretion.

Institutional Bias and Re-examination Safeguards: The Doctrine of Reassignment

A significant aspect of the High Court’s ruling lies in its direction that the fresh prosecution of Kobelco’s application be conducted by a different Patent Controller. During oral arguments, advocate Mr. Rahul Balaji requested that the re-examination on remand be reassigned, submitting that an officer who has previously rejected an application may harbor confirmation bias or prove unwilling to reverse an earlier finding.

The High Court accepted this submission, recognizing the practical risk of institutional bias. Under the administrative law doctrine of apprehended bias, justice must not only be done but must manifestly be seen to be done. When a quasi-judicial officer’s decision is set aside for failure to assign reasons or apply correct legal standards, remitting the matter back to the same individual creates a risk that the officer will attempt to justify the prior decision rather than evaluate the technical claims with an open mind. Reassigning the application to an independent officer protects the applicant’s right to a fair hearing.

Additionally, the Court imposed a strict four-month deadline from the date of receipt of the order for the new Controller to complete the de novo examination and issue final orders. This temporal boundary is crucial for commercial entities managing international patent portfolios, ensuring that administrative remands do not result in prolonged prosecution delays that erode the enforceable term of the patent.

Also Read: Madras HC Dismisses Patent Appeal: Expiry Renders Monopoly Moot

Strategic Guidance for IP Litigators, Patent Agents, and Corporate Portfolio Management

The ruling in Kobelco Compressors provides concrete strategic guidance for IP litigators, patent agents, and in-house corporate counsel prosecuting patent applications in India:

• Structuring Written Responses around the Hoffmann-La Roche Test: Patent agents must ensure that written submissions filed after a formal hearing explicitly structure their non-obviousness arguments around the five steps of F. Hoffmann-La Roche v. Cipla. Clear comparative tables highlighting exact structural and functional differences between the claimed invention and prior art citations D1, D3, and D7 should be included, directly challenging the examiner to address each technical distinction.
• Challenging Formal Objections on Claim Formatting: Where the Patent Office raises objections regarding the lack of a two-part claim format, practitioners should explain why single-part claims accurately define the inventive combination, citing established practice to prevent examiners from using formatting objections as a secondary ground for refusal.
• Building an Administrative Record for Section 117-A Appeals: In-house counsel must audit post-hearing orders to confirm whether the Controller explicitly addressed every argument and affidavit submitted during prosecution. If the final order contains generic template language or omits evaluation of the applicant’s response, appellate counsel can challenge the order under Section 117-A on administrative grounds without engaging immediately in complex technical debates on the merits.
• Requesting Reassignment in Remand Applications: Defense and prosecution litigators appealing improper rejection orders should routinely pray for a direction that fresh proceedings be conducted before an independent, different Controller, citing Kobelco Compressors Corporation as binding precedent to ensure an unbiased re-evaluation.

Through this ruling, the Madras High Court reinforces that procedural propriety and reasoned decision-making are mandatory prerequisites for patent examination in India, safeguarding international applicants against arbitrary administrative rejections.