The fact that the patentability of the limited patent is not checked by the EPO relies on the fact that the originally granted patent was valid when granted. Issues may however arise as a result of the absence of any check on patentability in rare cases where the priority right is endangered by the limitation.Andrea Veronese & Peter Watchorn, Procedural law under the EPC-2000, 3rd Edition May 2013, Kastner AG, Chapter XVIII.1.2.1. "Examination of substantive issues" , page 411.
