Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB858527661Aexternal-prioritypatent/GB8527661D0/en
Priority claimed from GB868610612Aexternal-prioritypatent/GB8610612D0/en
Priority claimed from GB868619329Aexternal-prioritypatent/GB8619329D0/en
Application filed by Ici PlcfiledCriticalIci Plc
Priority claimed from EP86308219Aexternal-prioritypatent/EP0223431B1/en
Application grantedgrantedCritical
Publication of ATE75419T1publicationCriticalpatent/ATE75419T1/en