(i) at least four years have elapsed since the filing of the patent application, save in the case of an invention relating to 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 núiclèach: