Fuel cell
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 4, 2007
Grant Date -
Aug 12, 2004
app pub date -
Mar 21, 2002
filing date -
Mar 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fuel cell powered by direct fuel, for example a direct methanol fuel cell, includes a polymer electrolyte membrane which includes a semi-crystalline polymer. Preferred semi-crystalline polymers include first repeat units comprising sulphonated aromatic group containing moieties linked by --SO.sub.2-- and/or --CO-- and/or -Q-groups, where Q is O or S and second repeat units which include aromatic group containing moieties linked by --CO-- and/or Q groups.
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