Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Reexamination Certificate
2005-08-02
2005-08-02
Spitzer, Robert H. (Department: 1724)
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
C095S045000, C095S054000, C096S010000, C096S013000, C096S014000, C055S524000, C055SDIG005
Reexamination Certificate
active
06923846
ABSTRACT:
A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.
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Attachment together with Appendices 1-8, 2002 in prior application, U.S. Appl. No. 09/839,920, filed Oct. 4, 2002.
Bikson Benjamin
Macheras James Timothy
Nelson Joyce Katz
L' Air Liquide—Societe Anonyme à Directoire et Conse
Spitzer Robert H.
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