R. 113 EPC says that decisions, summonses, notices and communications from the EPO must be signed by, or bear the seal of, the employee responsible. In T 390/86 the board decided that if the decision of a particular division was to be legally valid it had to bear the signatures of the members who had been appointed to that division to decide the issue.

Under R. 111(2) EPC appealable EPO decisions must be accompanied by a communication pointing out the possibility of appeal and drawing the attention of the parties to Art. 106 to 108 EPC, which specify how to file appeals.