$~

* IN THE HIGH COURT OF DELHI AT NEW DELHI Reserved on: 26.11.2025 Pronounced on: 24.02.2026 + LPA 129/2025, CM APPL. 10551/2025 BOEHRINGER INGELHEIM PHARMA GMBH AND CO KG .....Appellant Through: Dr. Abhishek Manu Singhvi and Mr. Prashanto Chandra Sen, Sr. Advs. with Dr Sanjay Kumar, Ms. Arpita Sawhney, Ms. Pallavi Kiran, Mr. Arun Kumar Jana, Ms. Pratiksha Varshney, Ms. Shivangi Mayaramka, Ms. Atiksha Girdhar, Mr. Siddhart Seem and Ms. Rashmi Goswami, Advs.

versus THE CONTROLLER OF PATENTS & ANR. .....Respondents Through: Ms. Nidhi Raman, CGSC with Mr. Arnav Mittal, GP with Mr. Mayank Sansanwal, Adv. for R-1 Mr. G. Nataraj, Mr. Rahul Bhujbal, Mr. Yash Raj and Mr. Jegadheesh R., Advs. for R-2 Ms. Swathi Sukumar, Sr. Adv. (Amicus Curiae)

CORAM:

HON'BLE MR. JUSTICE C. HARI SHANKAR HON'BLE MR. JUSTICE OM PRAKASH SHUKLA % JUDGMENT

24.02.2026 C. HARI SHANKAR, J.

[Statutory provisions have been reproduced to the extent relevant.]

A. The lis

1. This appeal raises the following two pure questions of law:

(i) Whether a revocation petition, under Section 64, 64. Revocation of patents. – of the Patents Act 1970, can be instituted or can survive after the petitioner has pleaded invalidity of the paten