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 US06/880,932external-prioritypatent/US4659771A/en
Application filed by Hercules IncfiledCriticalHercules Inc
Application grantedgrantedCritical
Publication of ATE58148T1publicationCriticalpatent/ATE58148T1/en