The Delhi High Court, in a recent decision dated February 23, 2024, in Mitsui Chemicals Inc. vs Controller of Patents, overturned the patent refusal order issued by the Controller in respect of patent application No. 3877/DELNP/200. This decision underscores the significance of procedural adherence, especially in handling of claims during the national phase entry of PCT applications. Background/Facts Mitsui Chemicals (the Appellant) filed a PCT national phase application titled "Plant Disease and Insect Damage Control Composition and Plant Disease and Insect…