Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2005-04-12
2005-04-12
Weiner, Laura (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S314000, C429S316000, C252S062200
Reexamination Certificate
active
06878475
ABSTRACT:
A proton exchange membrane for a fuel cell is prepared from a polyimidazole polymer having the formula:wherein R1-R3are independently H, a halogen, an alkyl or a substituted alkyl. X1and X2are independently or an electron withdrawing group such as CN. The membrane may be doped to alter its conductivity. The membrane may be prepared from a copolymer of the polyimidazole. Also disclosed is a fuel cell incorporating the membrane.
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Lei Hanwei
Ma Junqing
Wixom Michael
Zhang Pu
Gifford, Krass, Groh Sprinkle, Anderson & Citkowski, P.C.
T/J Technologies Inc.
Weiner Laura
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