In proceedings under Art. 112 EPC, the Enlarged Board consists of five legally and two technically qualified members; the chairman must be a legally qualified member (Art. 22(2) EPC). If a board of appeal refers a question to the Enlarged Board, at least four members of the Enlarged Board must not have taken part in the proceedings before the referring board (Art. 2(4) RPEBA).
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_v_b_2_2.htm
Date retrieved: 17 May 2021