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Priority claimed from US07/392,998external-prioritypatent/US5084200A/en
Priority claimed from US07/392,996external-prioritypatent/US5011620A/en
Priority claimed from US07/392,997external-prioritypatent/US5062988A/en
Application filed by Du PontfiledCriticalDu Pont
Priority claimed from EP90115043Aexternal-prioritypatent/EP0412475B1/en
Application grantedgrantedCritical
Publication of ATE97172T1publicationCriticalpatent/ATE97172T1/en