Why Priority Date Matters: Madras High Court Emphasises Importance Of Reasoned Orders

Introduction

The Madras High Court last year revisited a fundamental but often overlooked question in patent practice, namely how and when a claim is entitled to draw priority from a provisional specification. The High Court set aside the order of the Deputy Controller of Patents and Designs (‘Respondent 1’), who refused Indian Patent Application No. 4135/CHEN/2014 (‘Application’) filed by Rallis India Limited (‘Appellant’). In examining the manner in which the Indian Patent Office (‘IPO’) treated a cited prior art, the High Court underscored the necessity of reasoned and complete adjudication of all material contentions. The judgment offers timely guidance on the application of Section 11 of the Patents Act, 1970 (‘Act’), particularly where entitlement to priority forms the basis of a refusal. This article analyses the decision and its implications for patent prosecution and opposition practice.