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 US06/609,151external-prioritypatent/US4539426A/en
Priority claimed from US06/717,341external-prioritypatent/US4618711A/en
Application filed by American Home ProdfiledCriticalAmerican Home Prod
Priority claimed from EP19850303309external-prioritypatent/EP0167245B1/en
Application grantedgrantedCritical
Publication of ATE27812T1publicationCriticalpatent/ATE27812T1/en