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:
Dec. 30, 2008
Filed:
Dec. 09, 2003
Akihiko Yoshida, Hirakata, JP;
Yoshihiro Hori, Ikoma, JP;
Osamu Sakai, Moriguchi, JP;
Makoto Uchida, Hirakata, JP;
Eiichi Yasumoto, Soraku-gun, JP;
Shinya Kosako, Kobe, JP;
Akihiko Yoshida, Hirakata, JP;
Yoshihiro Hori, Ikoma, JP;
Osamu Sakai, Moriguchi, JP;
Makoto Uchida, Hirakata, JP;
Eiichi Yasumoto, Soraku-gun, JP;
Shinya Kosako, Kobe, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A carbon fiber woven fabric for use as a gas diffusion layer base material in a polymer electrolyte fuel cell has a surface that is smoothed and further optimized to inhibit non-uniform infiltration of a coating for water-repellent-layer formation, to provide an electrolyte membrane-electrode assembly suitable for operation under a high humidification condition. The gas diffusion layer base material may be a carbon fiber woven fabric, wherein a ratio of the area of gap portions where neither warp thread nor weft thread exists: (10/W−Y)(10/Z−X) to the area of portions where warp thread is crossing weft thread: XY mmis in the range of about 1/1500 to about 1/5, where the carbon fiber woven fabric has a warp density of Z threads/cm, a weft density of W threads/cm, a warp thickness of X mm and a weft thickness of Y mm.