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 GB848427291Aexternal-prioritypatent/GB8427291D0/en
Application filed by David John InstancefiledCriticalDavid John Instance
Priority claimed from EP85307353Aexternal-prioritypatent/EP0180365B1/de
Application grantedgrantedCritical
Publication of ATE76524T1publicationCriticalpatent/ATE76524T1/de