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ARTICLE · 19 NOVEMBER 2025

Interpreting "Diagnostic" In The Realm Of Section 3(i)

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In this article, the Hon'ble Madras High Court interprets the term "Diagnostic" in light of section 3(i) of the Indian Patents Act.

IndiaIntellectual Property

INTRODUCTION

In this article, the Hon'ble Madras High Court interprets the term "Diagnostic" in light of section 3(i) of the Indian Patents Act. This judgment clarifies the most perplexing questions such as whether the term "Diagnostic" should be limited to "in-vivo" or "in-vitro" diagnostic method, whether the term "Diagnostis" should be construed as a form of treatment, and whether the term screening would be qualified as diagnostic in the purview of section 3(i). This judgment outlines the steps to recognize and distinguish patentable from non-patentable matter, aiding both inventors and the Indian Patent Office in identifying patentable subject matter under section 3(i) of the Indian Patents Act.

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