d) Illegible signature 

In D 8/82 (OJ 1983, 378) the surname of the signature appeared only as a mark in which one could still discern the first letter and which was recognisably intended as a signature. The board held that it was valid since in several contracting states of the EPO there is no requirement that a signature be legible or recognisably composed of letters. It is enough that it serves to identify the signatory.