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 US06/521,420external-prioritypatent/US4516694A/en
Application filed by R & P Export Technologies IncfiledCriticalR & P Export Technologies Inc
Application grantedgrantedCritical
Publication of ATE42729T1publicationCriticalpatent/ATE42729T1/de