(i) at least four years have elapsed since the filing ol' lhe patent ap plication, save in the case of an invention relating lo a specifically nuclear subject:
(i) go bhfuil ar a laghad ceithre bliana caite ó chomhdú an iarratais ar phaitinn, ach amháin i gcás aireagáin a bhaineann go sonrach le hábhar núicléach;