Section 117E(1) in The Patents (Amendment) Act, 2002
(1)The Controller shall have the right to appear and be heard-(a)in any legal proceedings before the Appellate Board in which the relief sought includes alteration or rectification of the register or in which any question relating to the practice of the patent office is raised;(b)in any appeal to the Appellate Board from an order of the Controller on an application for grant of a patent-(i)which is not opposed, and the application is either refused by the Controller or is accepted by him subject to any amendments, modifications, conditions or limitations, or(ii)which has been opposed and the Controller considers that his appearance is necessary in the public interest, and the Controller shall appear in any case if so directed by the Appellate Board.
