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 GB868627960Aexternal-prioritypatent/GB8627960D0/en
Priority claimed from GB878709438Aexternal-prioritypatent/GB8709438D0/en
Application filed by Conoco Specialty ProdfiledCriticalConoco Specialty Prod
Priority claimed from EP87907921Aexternal-prioritypatent/EP0332641B1/de
Application grantedgrantedCritical
Publication of ATE103513T1publicationCriticalpatent/ATE103513T1/de