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 GB878715924Aexternal-prioritypatent/GB8715924D0/en
Priority claimed from GB888811177Aexternal-prioritypatent/GB8811177D0/en
Application filed by Shell Int ResearchfiledCriticalShell Int Research
Priority claimed from EP88201303Aexternal-prioritypatent/EP0298542B1/de
Application grantedgrantedCritical
Publication of ATE59037T1publicationCriticalpatent/ATE59037T1/de