Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature
Reexamination Certificate
2007-02-20
2007-02-20
Alejandro, Raymond (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Having magnetic field feature
C429S006000, C324S501000, C204S421000, C374S121000, C250S340000, C073S040000
Reexamination Certificate
active
10236804
ABSTRACT:
A method and system for detecting imperfections in a membrane electrode assembly of an electrochemical fuel cell, and more particularly for detecting defects within a proton exchange membrane in a membrane electrode assembly which is optionally sandwiched between conductive diffusion media layers or between conductive diffusion layers with at least one rigid solid that is transparent to infrared radiation. A potential voltage is applied across the membrane and the presence of a defect and preferably the location of a defect is determined by monitoring variations in intensity level of infrared radiation emitted from a surface of the membrane electrode assembly.
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Litteer Brian A
Murphy Michael W
Alejandro Raymond
General Motors Corporation
Harness & Dickey & Pierce P.L.C.
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