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 US06/520,412external-prioritypatent/US4492880A/en
Application filed by Parker Stanley IncfiledCriticalParker Stanley Inc
Application grantedgrantedCritical
Publication of ATE67904T1publicationCriticalpatent/ATE67904T1/de