Appeal 2007-0489
Application 10/190,822
system. The chemical sensor provides an indication of when the chemical
sensor is exposed to at least one of the electrocatalytic poisons.
(Specification 3-4). Claim 9 is reproduced below:
9. A fuel cell system, comprising:
a main fuel cell comprising a stack of constituent fuel cells,
wherein each of the constituent fuel cells comprises one or
more electrocatalytic sites inducing between a fuel and an
oxidant an electrochemical reaction that is inhibited by
exposure of the one or more electrocatalytic sites to one or
more electrocatalytic poisons;
a fuel stream delivery system that directs a fuel stream to the
main fuel cell;
an oxidant stream delivery system that directs an oxidant stream
to the main fuel cell; and
a sensor system coupled to the fuel stream delivery system at
one or more locations upstream of the main fuel cell and
comprising two or more chemical sensors and a manifold that
selectively couples the chemical sensors to the fuel stream
delivery system, wherein each of the chemical sensors provides
an indication of when the chemical sensor is exposed to at least
one of the electrocatalytic poisons.
The prior art set forth below is relied upon by the Examiner as
evidence of unpatentability.
Meltser US 5,637,415 Jun. 10, 1997
Grot US 6,001,499 Dec. 14, 1999
Wilkinson WO 00/02282 Jan. 13, 2000
Zhang US 6,527,943 B1 Mar. 3, 2003
Clingerman US 6,893,756 B2 May 17, 2005
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