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 US06/730,334external-prioritypatent/US4694939A/en
Application filed by Enertrols IncfiledCriticalEnertrols Inc
Application grantedgrantedCritical
Publication of ATE58210T1publicationCriticalpatent/ATE58210T1/en