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 US06/162,319external-prioritypatent/US4359055A/en
Priority claimed from US06/223,481external-prioritypatent/US4359056A/en
Application filed by Renco CorpfiledCriticalRenco Corp
Application grantedgrantedCritical
Publication of ATE19191T1publicationCriticalpatent/ATE19191T1/de