2.3. Date European patent takes effect and jurisdiction after pendency

Under Art. 97(3) EPC the decision to grant a European patent takes effect on the date on which the mention of the grant is published in the European Patent Bulletin (see also chapter IV.B.3.10. "Date on which a decision to grant a European patent takes effect"). A request under R. 139 EPC for corrections in the description or claims can only be filed during the pendency of application or opposition proceedings. In J 42/92 the Legal Board held that there was no reason why, once no application or opposition proceedings were pending before the EPO, decisions on the question of corrections should not fall within the sole jurisdiction of the national courts or other authorities responsible for proceedings in which this question might arise (see also T 777/97).