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Priority claimed from GB888803084Aexternal-prioritypatent/GB8803084D0/en
Priority claimed from GB888803085Aexternal-prioritypatent/GB8803085D0/en
Application filed by Emi Plc ThornfiledCriticalEmi Plc Thorn
Priority claimed from EP89301014Aexternal-prioritypatent/EP0329304B1/de
Application grantedgrantedCritical
Publication of ATE105645T1publicationCriticalpatent/ATE105645T1/de