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Priority claimed from US06/803,195external-prioritypatent/US4652683A/en
Priority claimed from US06/803,194external-prioritypatent/US4668826A/en
Application filed by Celanese CorpfiledCriticalCelanese Corp
Priority claimed from EP19860309339external-prioritypatent/EP0227331B1/en
Application grantedgrantedCritical
Publication of ATE74345T1publicationCriticalpatent/ATE74345T1/en