Asymmetric gas separation membranes
Patent 4654055 Issued on March 31, 1987. Estimated Expiration Date: 
March 31, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 31, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3616607 3657113 3775308 Method for sealing breaches in multi-layer ultrathin membrane composites Multicomponent membranes for gas separations Tube sheets for permeators Patent #: 4323454 InventorsApplicationNo. 06/509628 filed on 06/30/1983US Classes:96/13Ring containing organic compoundExaminersPrimary: Spitzer, RobertAttorney, Agent or FirmInternational ClassB01D 67/00 (20060101)AbstractAsymmetric gas separation membranes of materials having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture, exhibit significantly improved permeation selectivities for the at least one gas when the asymmetric membrane is contacted on one or both surfaces with an effective amount of a Bronsted-Lowry base. The improved asymmetric gas separation membranes, process for producing the improved membrane, and processes utilizing such membranes for selectively separating at least one gas from a gaseous mixture by permeation are disclosed.Other References
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