Proceedings before the boards are independent and decisions of national courts are not binding in law (see R 21/09, which is very detailed on this point, and, as examples of decisions dealing with the relationship between national case law and board decisions, T 1904/12, T 885/02, T 202/13, T 231/13, T 488/16).
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_vii_1_6.htm
Date retrieved: 17 May 2021