| http://www.w3.org/ns/prov#value | - The invention includes a process for making such membranes as well as a method of using such membranes....http://www.google.com/patents/US5163977?utm_source=gb-gplus-sharePatent US5163977 - Aging resistanceAdvanced Patent SearchPublication numberUS5163977 APublication typeGrantApplication numberUS 07/748,493Publication dateNov 17, 1992Filing dateAug 22, 1991Priority dateAug 22, 1991Fee statusLapse
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