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. 04, 2007
Filed:
Oct. 14, 2003
Mark F. Mathias, Pittsford, NY (US);
Joerg Roth, Trebur, DE;
Bhaskar Sompalli, Rochester, NY (US);
Michael Schoeneweiss, W. Henrietta, NY (US);
David Wood, Santa Fe, NM (US);
Mark F. Mathias, Pittsford, NY (US);
Joerg Roth, Trebur, DE;
Bhaskar Sompalli, Rochester, NY (US);
Michael Schoeneweiss, W. Henrietta, NY (US);
David Wood, Santa Fe, NM (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A porous diffusion media according to the present invention is positioned against a catalyst layer of the membrane electrode assembly, the porous matrix comprises carbon paper, and the water transfer particles comprise carbon fibers or powders. Relatively high and relatively low water transfer particle density regions alternate across the porous diffusion media. A first major face of the media may be collectively more hydrophilic than the second major face and the second major face may be collectively more hydrophobic than the first major face. The diffusion media is positioned against the catalyst layer along the first major face of the diffusion media and against a flow field of the fuel cell along the second major face of the diffusion media. The porous diffusion media comprises hydrophobic material disposed along the second major face of the diffusion media.