Tapas Chatterjee v. Assistant Controller of Patents and Designs & Anr., CM APPL. 66718/2023, CM APPL. 66719/2023, CM APPL. 66720/2023, CM APPL. 66721/2023 & CM APPL. 66722/2023

Court

Delhi High Court

Date of judgment

6 October 2025

Judge

C. Hari Shankar

Outcome

Remanded

Headnote

Letters Patent Appeal allowed in part in a pre-grant opposition over a process for recovering potassium sulphate from distillery spent wash. The Division Bench rejected the opponent's objection that the process was unpatentable under section 3(d), and remanded only the objection under section 25(1)(e) read with section 2(1)(ja), confined to the prior art the opponent had already cited.

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Headnote by BRB Legal, written from the judgment: a summary for reference, not legal advice. Read the judgment itself before relying on it.