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:
Nov. 20, 2007
Filed:
Nov. 18, 2004
Atsushi Kamachi, Saitama, JP;
Shunsuke Itami, Saitama, JP;
Hitoshi Okanobori, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A fuel cell includes a laminated, plate-shaped membrane electrode assembly and first and second separator plates sandwiching the membrane electrode assembly. The membrane electrode assembly includes a polymer electrolyte membrane; first and second electrode layers sandwiching the polymer electrolyte membrane; and first and second gas-diffusion layers disposed on an outer side of the electrode layers, respectively. The first and second gas-diffusion layers are made of an air-permeable metallic material. An arithmetic average roughness Ra of a surface of the air-permeable metallic material on the side contacting one of the electrode layers is in a range of 0.1 μm≦Ra≦1.0 μm.