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:
Jan. 06, 2009
Filed:
Jan. 26, 2005
Mikiko Yoshimura, Hirakata, JP;
Yoshihiro Hori, Ikoma, JP;
Yoichiro Tsuji, Katano, JP;
Akihiko Yoshida, Hirakata, JP;
Takeshi Yonamine, Mino, JP;
Makoto Uchida, Hirakata, JP;
Mikiko Yoshimura, Hirakata, JP;
Yoshihiro Hori, Ikoma, JP;
Yoichiro Tsuji, Katano, JP;
Akihiko Yoshida, Hirakata, JP;
Takeshi Yonamine, Mino, JP;
Makoto Uchida, Hirakata, JP;
Panasonic Corporation, Osaka, JP;
Asahi Glass Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a catalyst-coated membrane suitable for achieving a polymer electrolyte fuel cell that sufficiently prevents a decrease in the initial characteristics and also exhibits sufficient cell performance for a long period of time and has excellent durability. In at least the cathode catalyst layer, the ratio (W/W) of the weight of the polymer electrolyte (W) to the weight of the catalyst-carrying carbon (W) is decreased from an innermost layer positioned closest to the polymer electrolyte membrane toward an outermost layer positioned farthest from the polymer electrolyte membrane. The ratio (W/W) in the innermost layer is 0.8 to 3.0, and the ratio (W/W) in the outermost layer is 0.2 to 0.6.