If an invention is not excluded from patentability because it falls under one of the four categories in R. 28 EPC (see above), it must be then examined whether it is covered by the exception to patentability under Art. 53(a) EPC.
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_i_b_2_2.htm
Date retrieved: 17 May 2021