Section 117E of the Indian Patents Act
Section 117E of the Indian Patents Act 1970 is about Appearance of Controller in legal proceedings. It is under CHAPTER XIX of the Act. CHAPTER XIX is titled APPEALS TO THE APPELLATE BOARD.
Appearance of Controller in legal proceedings
(1) The Controller shall have the right to appear and be heard–
(a) in any legal proceedings before the [High Court] 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 [High Court] 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 [High Court].
(2) Unless the [High Court] otherwise directs, the Controller may, in lieu of appearing, submit a statement in writing signed by him, giving such particulars as he thinks proper of the proceedings before him relating to the matter in issue or of the grounds of any decision given by him or of the practice of the patent office in like cases, or of other matters relevant to the issues and within his knowledge as the Controller may deem it necessary, and such statement shall be evidence in the proceeding.
See also:
Section 117C Indian Patents Act 1970 (Bar of jurisdiction of courts, etc.)