Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature
Reexamination Certificate
2006-08-08
2006-08-08
Ryan, Patrick Joseph (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Having magnetic field feature
C429S006000, C429S006000
Reexamination Certificate
active
07087330
ABSTRACT:
Fuel cells (16) include a proton exchange membrane (18) with cathode catalyst (24) and anode catalyst (20) on opposing surfaces thereof. An anode support plate (21) includes a hydrophilic substrate (22) and a cathode support plate (25) includes a hydrophilic substrate (26) and a contact bilayer (diffusion layer) (24). Water transport plates (12, 14) are adjacent corresponding support plates. Upon shut down of the fuel cell stack, the support plates (21, 25) fill to 60%–80% of their water capacity, thereby to provide water (from melting ice) upon a bootstrap start of the frozen cells. In one embodiment, the amount of water is controlled by the pressure differential between the coolant and the reactant gases; in another embodiment, the amount of water is controlled by having hydrophobic regions (93) substantially uniformly dispensed in a hydrophilic substrate (94) in either the support plates (22a) or the contact bilayer (27).
REFERENCES:
patent: 5998058 (1999-12-01), Fredley
patent: 6379827 (2002-04-01), Cipollini
Parsons Thomas H.
Ryan Patrick Joseph
UTC Fuel Cells LLC
Williams M. P.
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