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US 5,334,697 AGranted
Polyimide gas separation membranes
AssigneeL'Air Liquide
InventorJohn W. Simmons
Life of this patent
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Abstract
A polyimide gas separation membrane containing repeating units derived from 9,9-disubstituted xanthene dianhydride is disclosed.
Claims6
A gas separation membrane formed from a polyimide incorporating at least one dianhydride unit based on a 9,9-disubstituted xanthene dianhydride.
Dependencies are inferred from the claim text.