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:
Dec. 23, 2003
Filed:
Sep. 13, 2001
Paul D. Beattie, Port Moody, CA;
David P. Wilkinson, North Vancouver, CA;
Paul Kozak, Mission, CA;
Haijiang Wang, Burnaby, CA;
Sheilah Neumann, Vancouver, CA;
John Robert Gordon, Vancouver, CA;
Kelvin Keen-Ven Fong, Burnaby, CA;
Sonia Geillis Wong-Cheung, Burnaby, CA;
Michael Todd Davis, Port Coquitlam, CA;
Bien Chiem, Burnaby, CA;
Lynn C. Erickson, Vancouver, CA;
Ballard Power Systems Inc., Burnaby, CA;
Abstract
Fluid diffusion layers with favorable mechanical and electrical properties are prepared for fuel cell electrodes by impregnating a porous carbonaceous web with a carbonizable polymer having pyrrolidone functionality and then carbonizing the pyrrolidone polymer. The polymer having pyrrolidone functionality is stabilized against vaporization by use of an oxidization step prior to carbonization. The fluid diffusion layers are particularly suitable for use as gas diffusion layers in solid polymer electrolyte fuel cells.