Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2005-03-15
2005-03-15
Ryan, Patrick (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S006000, C429S006000, C429S006000, C429S006000, C429S006000
Reexamination Certificate
active
06866955
ABSTRACT:
A fuel cell cooling system is provided with a coolant pump for pumping fluid through coolant flow field passages in a fuel cell stack. A pressure control mechanism is provided for maintaining a pressure level within the fuel cell stack for causing a phase change of the coolant within the stack. Allowing the coolant to change phase to a gas inside the stack reduces the amount of coolant needed to cool the fuel cell stack and thereby reduces the energy needed to pump the coolant through the fuel cell stack.
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Notification of Transmittal Of The International Search Report Or The Declaration, dated Sep. 2, 2003.
3M Novec Engineered Fluid HFE-8401HT, “A New Heat Transfer Fluid with Unique Heat Transfer Properties,” pp. 1-7 (1999).
Lee James H.
Skala Glenn W.
General Motors Corporation
Martin Angela J.
Ryan Patrick
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