Rule 39⁶³
Designation fees

(1) The designation fee shall be paid within six months of the date on which the European Patent Bulletin mentions the publication of the European search report. 

(2)⁶⁴ Where the designation fee is not paid in due time or the designations of all the Contracting States are withdrawn, the European patent application shall be deemed to be withdrawn. 

(3) Without prejudice to Rule 37, paragraph 2, second sentence, the designation fee shall not be refunded.