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:
May. 19, 2009
Filed:
Jan. 23, 2003
Kiehyun Nam, Palo Alto, CA (US);
Helen Xu, Sunnyvale, CA (US);
Shuguang Cao, Mountain View, CA (US);
David Olmeijer, San Francisco, CA (US);
Jon Servaites, San Francisco, CA (US);
Ying Wang, Milpitas, CA (US);
Kiehyun Nam, Palo Alto, CA (US);
Helen Xu, Sunnyvale, CA (US);
Shuguang Cao, Mountain View, CA (US);
David Olmeijer, San Francisco, CA (US);
Jon Servaites, San Francisco, CA (US);
Ying Wang, Milpitas, CA (US);
Polyfuel, Inc., Mountain View, CA (US);
Abstract
An acid-base proton conducting polymer blend membrane is provided. The acid-base proton conducting polymer blend membrane comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, and a third polymer containing one or more functional units for improving membrane conductivity, flexibility, water remaining ability, dimension stability, and methanol crossover. In one embodiment, the acid-base polymer blend membrane of the present invention comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, wherein at least one of the first acidic and second basic polymer comprises one or more functional units to improve the properties of the membrane. The functional units include hydrophilic units, methanol blocking units, methanol blocking units, dimensional stabilizer units, and flexible units.