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 US06/768,978external-prioritypatent/US4649810A/en
Application filed by Wong Don MfiledCriticalWong Don M
Application grantedgrantedCritical
Publication of ATE61511T1publicationCriticalpatent/ATE61511T1/de