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:
Jul. 24, 2007
Filed:
Jun. 10, 2005
William J. Koros, Atlanta, GA (US);
David Wallace, Smyrna, GA (US);
John Wind, Berkeley, CA (US);
Stephen J. Miller, San Francisco, CA (US);
Claudia Staudt-bickel, Heidelberg, DE;
William J. Koros, Atlanta, GA (US);
David Wallace, Smyrna, GA (US);
John Wind, Berkeley, CA (US);
Stephen J. Miller, San Francisco, CA (US);
Claudia Staudt-Bickel, Heidelberg, DE;
Chevron U.S.A. Inc., San Ramon, CA (US);
Abstract
A composition of and a method of making high performance hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide polymer comprising covalently bonded ester crosslinks. The resultant hollow fiber membrane exhibits a high permeability of COin combination with a high CO/CHselectivity. Another embodiment provides a method of making the hollow fiber membrane from a monesterified polymer followed by final crosslinking after hollow fiber formation.