council resolut decemb convent european patent common market council european commun regard treati establish european econom commun repres member state european econom commun dai sign convent european patent common market council opinion repres member state declar preambl convent conclus convent facilit achiev task european econom commun measur member state subject nation ratif procedur ensur fulfil commun oblig resolv member state parti convent european patent common market measur ensur implement