(1) The President of the German Patent and Trade Mark Office may, if he considers it appropriate to safeguard the public interest, make written declarations to the Federal Patent Court in the appeal proceedings, participate in the hearings and make statements in the course of the proceedings. Written declarations on the part of the President of the German Patent and Trade Mark Office shall be notified to the parties by the Federal Patent Court.
(2) The Federal Patent Court may provide the President of the German Patent and Trade Mark Office with the option to intervene in the appeal proceedings if it considers this to be suitable because of a legal issue which is of fundamental importance. Upon receipt of the declaration of intervention, the President of the German Patent and Trade Mark Office shall become a party.