The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1999
Filed:
Oct. 25, 1996
Applicant:
Inventors:
James Timothy Macheras, Quincy, MA (US);
Benjamin Bikson, Brookline, MA (US);
Joyce Katz Nelson, Lexington, MA (US);
Assignee:
Praxair Technology, Inc., Danbury, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D02G / ; B01D / ; B01D / ; B29C / ;
U.S. Cl.
CPC ...
428398 ; 428394 ; 428395 ; 428397 ; 428421 ; 428422 ; 55522 ; 55527 ; 96-8 ; 96 10 ; 21050023 ; 21050024 ; 21050039 ; 264 41 ; 26417714 ; 26472717 ; 264178 ; 26421114 ;
Abstract
Improved anisotropic fluid separation membranes are prepared from blends of polymers with surface energy differences. The membranes are formulated by processes wherein low surface energy polymer with desirable fluid separation and permeation characteristics is preferentially concentrated in the surface discriminating layer of the membrane.