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Priority claimed from US07/401,086external-prioritypatent/US4986361A/en
Priority claimed from PCT/US1990/004696external-prioritypatent/WO1991003620A1/en
Application filed by Union Oil CofiledCriticalUnion Oil Co
Publication of NO920748D0publicationCriticalpatent/NO920748D0/en
Publication of NO920748LpublicationCriticalpatent/NO920748L/en