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:
Mar. 30, 2010
Filed:
Sep. 22, 2005
Masaki Yamauchi, Osaka, JP;
Yoshihiro Hori, Nara, JP;
Akihiko Yoshida, Osaka, JP;
Mikiko Yoshimura, Tokyo, JP;
Makoto Uchida, Osaka, JP;
Masaki Yamauchi, Osaka, JP;
Yoshihiro Hori, Nara, JP;
Akihiko Yoshida, Osaka, JP;
Mikiko Yoshimura, Tokyo, JP;
Makoto Uchida, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a conventional polymer membrane electrode assembly, particularly when operated for a long period of time, a portion of the polymer electrolyte membrane to be in contact with the gas diffusion layer has suffered significant degradation. In order to address this, in a membrane electrode assembly including a hydrogen ion conductive polymer electrolyte membrane, a pair of catalyst layers arranged on both surfaces of the polymer electrolyte membrane, and a pair of gas diffusion layers, each including a fibrous substrate, arranged on the outer surfaces of the catalyst layers, a thickness Tof a center portion that faces the catalyst layer and a thickness Tof a peripheral portion surrounding the center portion are set to satisfy a expression (1):0.7≦≦0.9.