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 CA000401539Aexternal-prioritypatent/CA1186492A/en
Application filed by Cheh Christopher Huk Shi, Roger William GlassfiledCriticalCheh Christopher Huk Shi
Priority claimed from EP82306503Aexternal-prioritypatent/EP0085809B1/en
Application grantedgrantedCritical
Publication of ATE29084T1publicationCriticalpatent/ATE29084T1/en