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 US06/728,325external-prioritypatent/US4632663A/en
Application filed by Sofec IncfiledCriticalSofec Inc
Application grantedgrantedCritical
Publication of ATE65225T1publicationCriticalpatent/ATE65225T1/en