If, in response to the invitation to correct a priority claim, the applicant does not submit a notice correcting the priority claim before expiry of the applicable time limit (see GL/PCT-EPO A-VI, 1.4.1), that priority claim is, for the purposes of the PCT procedure, considered void and the RO so declares using Form PCT/RO/111. In addition to marking the PCT request in accordance with GL/RO 172, the RO also sends to the IB and the ISA, respectively, a copy of that declaration and a copy of the corresponding sheet of the request containing the marking.[R. 26bis.1(a); R. 26bis.2(b); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/a_vi_1_4_2.htm
Date retrieved: 17 May 2021