b) Mere aid in assessing the allowability of amendments

The board in T 1472/15, citing T 2311/10 and T 1852/13, held that, contrary to how T 331/87 had often been misinterpreted, the "essentiality test" was not absolute vis-à-vis the "gold standard" and could merely be used as an aid in ascertaining what had been originally disclosed (see also e.g. T 648/10, T 755/12, T 2095/12, T 2599/12, T 46/15, T 1420/15, T 85/16 and T 1189/16). The "essentiality test" cannot take the place of the "gold standard" (T 172/17 and T 1134/19).