The gold(en) standard?
This case concerns a divisional application in which a feature was removed from claim 1 with respect to claim 1 of the parent application, and whether such removal satisfies the requirements of Art. 76(1) EPC (and equivalently Art. 123(2) if it were to be performed as amendment).
This situation is dealt with by the 'essentiality test' of T 331/87.
This case discusses the essentiality test as it differs across its various versions (English original vs. German translation, original decision vs. guidelines), how it was applied in the recent past, criticism on the test including the criticism raised previously in T 910/03, and most importantly, how it fits into the 'gold standard' established by G 2/10.
After various deliberations, the Board considers the essentiality test to be dead: "Die Kammer ist zum Schluss gelangt, dass der Wesentlichkeitstest nicht mehr zum Einsatz kommen sollte", with one of the reasons being that the original phrasing of 'may not' in T 331/87 leaves open the possibility that all three conditions of the test are satisfied yet that Art. 123(2) is still violated.
As such, the Board considers that the essentiality test cannot replace the gold standard even in its specific application area (removal or replacement of a feature).
Is the essentiality test now finally dead? After T 910/03 it languished but occasionally reappeared.
The Board refrains from referring the matter to the EBoA as it considers such referral not to be decisive in the present case, since according to the Board a same conclusion would be reached using both the essentiality test and the gold standard (being that the removal violates Art. 76(1) EPC).