R. 28 EPC, which sets out four non‑patentable categories, entered into force on 1 September 1999 as R. 23d EPC 1973. It applies equally to applications pending on, i.e. filed before, the date of its entry into force (G 2/06, T 315/03).
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_i_b_2_1.htm
Date retrieved: 17 May 2021