EP claims priority of P1 and P2, D is the disclosure of A+B.
1.1.90
1.2.90
1.3.90
1.6.90
Filing
Publication
Filing
Filing
P1
D
P2
EP
A + B
A + B
A + B + C
claim 1: A + B
claim 2: A + B + C
Claim 1 has a valid priority of P1 for its subject-matter, thus publication D is not state of the art under Art. 54(2) against this claim. Claim 2 cannot benefit from the priority of P1, as it does not concern the same subject-matter. Thus publication D is state of the art under Art. 54(2) for this claim (see G 3/93). It is immaterial whether claim 2 is in the form of a dependent or an independent claim.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/f_vi_2_4_3.htm
Date retrieved: 17 May 2021