See H‑III, 4.2 for the transitional applicability of Art. 54(4) EPC 1973 to applications which were pending on 13 December 2007 and patents which had already been granted on that date.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/g_iv_5_3.htm
Date retrieved: 17 May 2021