Delhi High Court Validates Employment Agreements as Proof of Right in Patent Applications Involving Deceased Inventors

Introduction

In a significant ruling for intellectual property practitioners, the Delhi High Court has set aside a Patent Office order rejecting Nippon Steel Corporation's patent application, holding that an employment agreement signed by a deceased inventor constitutes valid "proof of right" under Section 7(2) of the Patents Act, 1970. Delivered on December 24, 2025, by Justice Tejas Karia in Nippon Steel Corporation v. The Controller of Patents (C.A.(COMM.IPD-PAT) 10/2025), the judgment clarifies the evidentiary requirements for assignees filing patent applications, particularly when an inventor has passed away. This decision overturns the Controller's insistence on an assignment from the inventor's legal representative and emphasizes that procedural requirements should facilitate, not obstruct, justice. The case involved a patent for a "high-strength steel sheet and manufacturing method," highlighting practical implications for multinational corporations relying on employee inventions.

The ruling addresses a common challenge in patent prosecution: establishing ownership when inventors are employees and one is deceased. Nippon Steel, as the appellant, argued that its internal policies and employment contracts sufficiently vested rights in the company. The Controller, however, viewed these documents as inadequate, equating them to post-grant assignment formalities. By distinguishing between the right to apply for a patent and assignment of a granted patent, the court has provided much-needed clarity, potentially streamlining patent filings for employers worldwide operating in India.

Case Background

The dispute originated from Indian Patent Application No. 202117029591, filed by Nippon Steel Corporation on July 1, 2021, under Section 15 of the Patents Act. The application claimed a novel invention titled "High-Strength Steel Sheet and Manufacturing Method of High-Strength Steel Sheet," naming four inventors: Hiroyuki Kawata, Eisaku Sakurada, Kohichi Sano, and Takafumi Yokoyama—all employees of Nippon Steel. Tragically, Kohichi Sano had passed away prior to the filing, a fact disclosed to the U.S. Patent Office in May 2021 but not immediately to the Indian Patent Office.

At the time of filing, Nippon Steel submitted Form 1, signed by the three surviving inventors, along with a declaration and its "Basic Regulations regarding Intellectual Property." These regulations, binding on all employees, stipulated under Article 8 that intellectual property created during employment vests automatically in the company. A request for examination followed on November 21, 2022, leading to a First Examination Report (FER) dated December 12, 2022, which raised objections including lack of "proof of right" for Sano under Section 7(2).

Nippon Steel responded on May 1, 2023, amending claims and asserting that the filed documents met the proof of right requirement. A hearing was scheduled for March 7, 2024, but adjourned to April 4, 2024. Post-hearing, on May 14, 2024, the company submitted written submissions, an affidavit, and the English translation of the Employer-Employee Agreement (EE Agreement) dated March 31, 2007, signed by Sano and a guarantor. This agreement outlined Sano's employment terms, implicitly tying into the company's IP policies.

Despite these efforts, the Controller issued a refusal order on November 27, 2024, under Section 15, citing non-compliance with Sections 6(1)(b), 6(1)(c), and 7(2). The Controller argued that the EE Agreement lacked a specific IP transfer clause, was unsigned by Sano in the submitted copy (overlooking the original), and required an assignment from Sano's legal representative given his death. It also invoked Section 68, which governs assignments of granted patents, and noted the delayed disclosure of Sano's death without a death certificate. Aggrieved, Nippon Steel appealed under Section 117A on January 2025, leading to the High Court's intervention.

This timeline underscores the procedural hurdles in Indian patent law, where formalities can delay innovation protection. The case's roots trace back to the inventors' work at Nippon Steel, a Japanese multinational, emphasizing cross-jurisdictional IP management challenges.

Arguments Presented

Nippon Steel's counsel, led by Mr. Debashish Banerjee, Ms. Vaishali Joshi, and Mr. Tanveer Malhotra, mounted a robust defense centered on statutory compliance and practical equity. They contended that Form 1, signed by three inventors, combined with the declaration and Basic Regulations, established proof of right under Section 7(2), which merely requires evidence of the applicant's entitlement to file, not rigid formalities. The EE Agreement, signed by Sano in 2007, confirmed his employee status and, read with corporate policies, automatically assigned IP rights to the company during employment. They highlighted that Section 6(1)(b) entitles assignees to apply, without mandating legal representative involvement for deceased inventors whose rights had already vested pre-death.

The appellant stressed inconsistency in Patent Office practice, noting six prior applications involving the same inventors—granted in 2023-2024—accepted the identical documents. They distinguished Section 68 (post-grant assignments) from Section 7(2) (application stage), arguing the latter allows flexible proof like employment contracts. Precedents such as NTT DoCoMo Inc. v. Controller of Patents (IPAB, 2013) and NEC Corporation v. Assistant Controller (Madras HC, 2023) were cited to support employment agreements as valid evidence. International comparisons to the European Patent Guide (Provision 5.11.004) and U.S. Manual of Patent Examining Procedure (MPEP Chapter 0300) reinforced that written evidence, including contracts, suffices for ownership proof.

The respondent, represented by CGSC Ms. Nidhi Raman with Messrs. Om Ram and Mayank Sansanwal, countered that the EE Agreement's general terms lacked an explicit IP transfer clause referencing Article 8 of the Basic Regulations, rendering it ambiguous and non-compliant with Section 7(2). They emphasized Sano's death, undisclosed until written submissions, and the absence of a death certificate or assignment from his legal representative under Section 6(1)(c). The Controller argued Form 1 requires inventor signatures or authenticated assignments executed pre-filing, and mere declarations are insufficient in India, unlike variable foreign practices.

Relying on NTT DoCoMo for strict proof requirements, the respondent invoked Section 68's writing and execution mandates, extending them to applications. They claimed the U.S. declaration (unsigned by Sano) was irrelevant, and non-disclosure violated transparency, justifying refusal under Section 43(1)(b) for contravening the Act. Overall, the respondent portrayed the documents as failing to unequivocally vest rights, risking legal uncertainties.

These arguments revealed a tension between procedural rigor and substantive justice, with the appellant advocating flexibility for employee-driven innovations and the respondent prioritizing unassailable documentation.

Legal Analysis

Justice Tejas Karia's reasoning dissected the Patents Act's framework, distinguishing procedural nuances often conflated by the Patent Office. The core issue—sufficiency of the EE Agreement and declaration as "proof of right" under Section 7(2)—was resolved by interpreting the provision literally: it demands evidence of entitlement to apply, furnishable with the application or within a prescribed period, without prescribing formats like deeds.

The court rejected the Controller's reliance on Section 68, clarifying it applies exclusively to assignments of granted patents, not the antecedent right to apply. Section 6(1)(b) empowers assignees to file, and Section 6(1)(c) addresses legal representatives only if the deceased held unassigned rights pre-death. Here, Sano's employment vested rights in Nippon Steel automatically, obviating post-death formalities. The EE Agreement, signed by Sano and attested by a guarantor, when harmonized with declarations and Basic Regulations, unequivocally established this vesting.

Precedents bolstered this view. In NTT DoCoMo Inc. v. Controller of Patents (IPAB Order No. 252/2013), proof was mandated regardless of priority grants, but the court distinguished it as not barring employment evidence. NEC Corporation v. Assistant Controller (2023 SCC OnLine Mad 7894) affirmed assignees' rights under Section 6(1)(b) via contracts. The Supreme Court's Kailash v. Nanhku & Ors. (2005) 4 SCC 480 was pivotal, quoted to affirm: "All the rules of procedure are the handmaid of justice... provisions of the CPC or any other procedural enactment ought not to be construed in a manner which would leave the court helpless to meet extraordinary situations in the ends of justice." This underscored that Section 7(2) facilitates adjudication, not subverts it.

The judgment drew international parallels: the European Patent Guide accepts any written evidence verifying transfer, including signed contracts, while the U.S. MPEP endorses employment agreements for ownership. Domestically, the Patent Office's acceptance of identical documents in six prior grants evidenced arbitrary application, rendering the refusal unsustainable.

Key distinctions emerged: proof of right at application stage (flexible) versus post-grant assignment (formal under Section 68); employee vesting (automatic via policy/contract) versus individual assignments. The court noted all inventors were employees, minimizing disputes. This analysis not only resolves the instant case but recalibrates patent examination toward equity, preventing technicalities from derailing meritorious applications.

Key Observations

The judgment features several incisive observations that encapsulate the court's philosophy on procedural flexibility in IP law:

• On the validity of employment agreements: "Employment Agreement entered between the Employer (assignee) and Employee (inventor), which is duly signed by the deceased inventor, is an acceptable document to comply with the requirement of 'proof of the right' under Section 7(2) of the Act."

• Harmonizing documents: "When construed harmoniously with the accompanying declarations, the EE Agreement sufficiently establishes and addresses the ownership of IPR vested thereunder."

• On procedural laws: "Procedural laws are intended to subserve, and not to subvert, the cause of justice. Procedural laws are an instrument that facilitates rather than obstructs adjudication."

• Invoking Supreme Court wisdom from Kailash v. Nanhku : "All the rules of procedure are the handmaid of justice. The language employed by the draftsman of processual law may be liberal or stringent, but the fact remains that the object of prescribing procedure is to advance the cause of justice."

• Critique of impugned order: "The observation in the Impugned Order that the EE Agreement cannot constitute valid 'proof of the right' or assignment for the Subject Application due to its generic nature, inherent ambiguity, and non-compliance with the mandatory requirements prescribed under Sections 6(1)(b), 7(2), and 68 of the Act is not correct."

These excerpts highlight the court's emphasis on substantive rights over form, offering quotable guidance for future IP disputes.

Court's Decision

The Delhi High Court allowed the appeal, setting aside the November 27, 2024, refusal order in its entirety. Justice Karia directed the Controller to re-examine Application No. 202117029591 and pass appropriate orders for grant in accordance with law, without prejudice to other objections like novelty under Sections 2(1)(ja) or 3.

The implications are profound for legal practice. Employers, especially in tech and manufacturing, can now rely more confidently on employment contracts and internal policies to establish proof of right, reducing the need for bespoke assignments—particularly burdensome with deceased inventors. This averts delays and costs, as seen in Nippon Steel's prior grants, and aligns Indian practice with global standards, potentially boosting foreign investment in R&D.

Future cases may see fewer rejections on formal grounds, with Patent Offices urged to apply consistent, non-arbitrary standards. However, applicants must still disclose material facts like an inventor's death promptly and ensure documents are authenticated. Broader effects include reinforcing employee IP as corporate assets, influencing contract drafting to include explicit vesting clauses. For legal professionals, this ruling is a toolkit for advising clients on Section 7(2) compliance, emphasizing harmonious document construction over hyper-technical scrutiny.

In sum, the decision advances justice in IP adjudication, ensuring procedural tools serve innovation rather than stifle it. A copy of the order was forwarded to the Controller General for compliance, signaling systemic impact.