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:
Sep. 17, 2013
Filed:
Oct. 25, 2010
Toshihiro Tanuma, Tokyo, JP;
Toshihiro Tanuma, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A membrane electrode assembly less susceptible to flooding or shortcircuiting caused by piercing of carbon fibers of a gas diffusion layer to a polymer electrolyte membrane is provided, containing a cathode having a catalyst layer and a gas diffusion layer, an anode having a catalyst layer and a gas diffusion layer, and a polymer electrolyte membrane interposed between the catalyst layer of the cathode and the catalyst layer of the anode, wherein each of the cathode and the anode further has a protective layer containing carbon fibers having an average fiber diameter of from 1 to 30 μm and a fluorinated ion exchange resin, between the catalyst layer and the gas diffusion layer, and the mass ratio (F/C) of the fluorinated ion exchange resin (F) to the carbon fibers (C) contained in the protective layer is from 0.05 to 0.30.