(2) The Controller shall, on receipt of the request - (a) immediately notify the owner of the patent and the person against whom the request is directed; and (b) ask the owner of the patent and the person against whom the request is directed, for their views which shall reach the Controller within 21 days of the date of the notification. (3) The Controller shall hold a hearing within a period of 3 months of the expiry of the 21 days referred to in paragraph (2)(b). (4) The owner of the patent and the person against whom the request is directed, or any interested parties shall comply with such directives as may be issued by the Controller as regards the conduct of the hearing. (5) The Controller may, before granting a non-voluntary licence, consult such person or authority as he thinks fit. (6) Where the Controller grants a non-voluntary licence, he shall state the terms of exploitation and transmit the decision to grant such licence to the interested parties. (7) A decision under paragraph (6) shall be recorded and published by the Controller. (8) Where the decision of the Controller to grant a licence under paragraph (6) is subject to an appeal, he shall record and publish the decision once it becomes final. 31. (1) The Controller shall maintain a patent application and a patent on payment of the appropriate annual maintenance fee specified in the First Schedule.