As per Sec. 20(4) Patent Act,
Where one of two or more joint applicants for a patent dies at any time before the patent has been granted, the Controller may, upon a request in that behalf made by the survivor or survivors, and with the consent of the legal representative of the deceased, direct that the application shall proceed in the name of the survivor or survivors alone.
On claim - 500/- for natural person or Rs. 2000/- in case of company
On request for direction - 500/- for natural person or Rs. 2000/- in case of company