Enforcement and Validity
Almost all attributes of a European patent in a Contracting State, i.e. ownership, validity, and infringement, are determined independently under respective national law, except for the opposition procedure, limitation procedure, and revocation procedure as discussed above. Though the EPC imposes some common limits, the EPC expressly adopts national law for interpretation of all substantive attributes of a European patent in a Contracting State, with a few exceptions. Thus, almost all post-grant proceedings - including renewal, revocation proceedings (when initiated by somebody else than the proprietor), and infringement enforcement are determined under national law.
EPO Boards of Appeal decisions are not precedential at all upon national courts, which have exclusive jurisdiction on validity and infringement after a European patent has been granted (except during the 9 month opposition period, which can only relate to validity). However, national courts will tend to take note, and may find 'persuasive', decisions of the EPO Boards, though they can disagree with them.
Read more about this topic: European Patent Convention
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