In T 363/11 the board considered that the feature concerned was a negative feature, in the sense that it defined embodiments which were excluded from the claim. Since after the amendment more embodiments were excluded from claim 1 of the request than from claim 1 as granted, its scope was reduced vis-à-vis granted claim 1 and the requirements of Art. 123(3) EPC were satisfied.
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_ii_e_2_4_8.htm
Date retrieved: 17 May 2021