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:
Jul. 14, 2009
Filed:
Feb. 23, 2005
Akihiko Yoshida, Hirakata, JP;
Masaki Yamauchi, Neyagawa, JP;
Yoshihiro Hori, Ikoma, JP;
Makoto Uchida, Hirakata, JP;
Akihiko Yoshida, Hirakata, JP;
Masaki Yamauchi, Neyagawa, JP;
Yoshihiro Hori, Ikoma, JP;
Makoto Uchida, Hirakata, JP;
Panasonic Corporation, Osaka, JP;
Abstract
To provide a gas diffusion layer excellent in micro short-circuit resistance and anti-flooding characteristics by optimizing the surface shape of a gas diffusion layer. In a gas diffusion layer for a gas diffusion electrode including at least a catalyst layer containing an electrode catalyst and a gas diffusion layer having electron conductivity and gas diffusibility, a second surface of the gas diffusion layer, which is positioned opposite to a first surface thereof to be in contact with the catalyst layer, is made rougher than the first surface. The first surface has a maximum height Ryof 10 to 50 determined by JIS B 0601 surface roughness measurement method, and the second surface has a maximum height Ryof 100 to 500 determined by JIS B 0601 surface roughness measurement method.