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:
Apr. 05, 2011
Filed:
Nov. 07, 2005
Yozo Nagai, Ibaraki, JP;
Toshimitsu Tachibana, Ibaraki, JP;
Soji Nishiyama, Ibaraki, JP;
Tetsuya Yamaki, Takasaki, JP;
Masaharu Asano, Takasaki, JP;
Masaru Yoshida, Takasaki, JP;
Yozo Nagai, Ibaraki, JP;
Toshimitsu Tachibana, Ibaraki, JP;
Soji Nishiyama, Ibaraki, JP;
Tetsuya Yamaki, Takasaki, JP;
Masaharu Asano, Takasaki, JP;
Masaru Yoshida, Takasaki, JP;
Japan Atomic Energy Agency, Ibaraki, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A method for producing a polymer electrolyte membrane for electrolyte fuel cells includes: irradiating gamma rays onto a polymer substrate to obtain a crosslinked polytetrafluoroetylene substrate, grafting a styrenic monomer and bis(vinylphenyl)ethane as monomers to the crosslinked polymer substrate, and introducing sulfonic acid groups into graft side chains formed by grafting. Fluoro polymer substrates such as polytetrafluoroethylene and ethylene tetrafluoroethylene copolymer may be used.