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 US07/085,476external-prioritypatent/US4821697A/en
Application filed by John A McdougalfiledCriticalJohn A Mcdougal
Application grantedgrantedCritical
Publication of ATE97194T1publicationCriticalpatent/ATE97194T1/de