1 Where, in respect of one and the same invention, two patents having the same priority date have been granted to the same inventor or to his successor in title, the patent resulting from the national application ceases to have effect as of the date of the grant of the patent resulting from the international application, irrespective of whether the priority of the national application is claimed for the patent resulting from the international application or whether the priority of the international application is claimed for the patent resulting from the national application.