Patents Act, 1970
(1) A patentee may, at any time by giving notice in the prescribed manner to the Controller, offer to surrender his patent.
(2) Where such an offer is made, the Controller shall advertise the offer in the prescribed manner, and also notify every person other than the patentee whose name appears in the register as having an interest in the patent.
(3) Any person interested may, within the prescribed period after such advertisement, give notice to the Controller of opposition to the surrender, and where any such notice is given the Controller shall notify the patentee.
(4) If the Controller is satisfied after hearing the patentee and any opponent, if desirous of being heard, that the patent may properly be surrendered, he may accept the offer and, by order, revoke the patent.