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 US06/779,140external-prioritypatent/US4657948A/en
Application filed by Ethyl CorpfiledCriticalEthyl Corp
Priority claimed from EP19860303564external-prioritypatent/EP0201355B1/de
Application grantedgrantedCritical
Publication of ATE66048T1publicationCriticalpatent/ATE66048T1/de