Rule 21
Oral proceedings

(1)Oral proceedings shall take place either at the instance of the European Patent Office if it considers this to be expedient or at the request of any party to the proceedings. However, the European Patent Office may reject a request for further oral proceedings where the parties and the subject of the proceedings are the same. 

(2)Nevertheless, in the procedure concerning the request for unitary effect, oral proceedings shall take place before the Unitary Patent Protection Division at the request of the proprietor of the European patent only where the Unitary Patent Protection Division considers this to be expedient. 

(3)Oral proceedings before the Unitary Patent Protection Division shall not be public.