Appeal No. 2006-1311
Application No. 10/101,177
carbon layer infiltrate into at least part of pore portions of
the above carbon substrate,
coating said carbon layer with a liquid containing a
catalyst and a fluorocarbon polymer having sulfonic acid groups
to form a catalyst layer,
followed by impregnation with a solution containing a
solvent-soluble fluorine-containing polymer having substantially
no ion exchange group and baking at from 100 to 200°C to prepare
a gas diffusion electrode,
disposing an anode and a cathode to face each other, by
using the above gas diffusion electrode as the anode and/or the
cathode so that the above catalyst layer faces inside, and
interposing between the anode and the cathode an ion
exchange membrane comprising a fluorocarbon polymer having
sulfonic acid groups having a thickness of from 20 to 150 μm,
followed by hot pressing, so that the anode and the cathode are
bonded to each side of the ion exchange membrane.
In addition to the admitted prior art found in appellants'
specification, the examiner relies upon the following references
as evidence of obviousness:
Yoshitake et al. 6,528,200 B1 Mar. 4, 2003
(Yoshitake '200)
(English equivalent to JP 09320611)
Mizuno et al. (JP '897) JP 08007897 Jan. 12, 1996
(Japanese Patent)
Yoshitake et al. (Yoshitake) JP 09320611 Dec. 12, 1997
(Japanese Patent)
Moriga et al. (Moriga) JP 06044985 Feb. 18, 1994
(Japanese Patent)
Appellants' specification, pages 1-6
-2-
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