A European patent is a patent granted on the basis of the Munich Convention on the Grant of European Patents of October 5, 1973 (hereinafter referred to as the "Convention"). A European patent application shall be filed with the Hungarian Intellectual Property Office (HIPO) if the applicant is Hungarian citizen or if his residence or seat is in Hungary, unless, in the European patent application, the priority of a patent application which was not classified by the President of the Hungarian.