Appeal 2007-0128
Reexamination Control 90/006,208
Patent 5,573,648
compounds to form an electrode having a “three-phase interface to minimize
internal resistance to transport.” (Id. at col. 2, ll. 36-43).
33) Vanderborgh describes a suitable composite electrode as follows:
In one embodiment, the composite electrode 13 of the present
invention is formed of three separate layers or zones as illustrated
generally in FIG. 2 as 22, 24, and 26. Each layer or zone comprises a
mixture of carbon black, platinum or other suitable electrocatalyst
dispersed and supported on carbon black, polytetrafluoroethylene as a
binder, and a suitable ionic conducting material, such as
polyperfluorosulfonic acid. Suitable carbon black for use in
manufacturing the composite electrode of the present invention
possesses a relatively high surface area, a high electrical conductivity,
and a low chemical reactivity. Vulcan XC-72 ® manufactured by
Cabot Corporation is a preferred carbon black. It is preferred to utilize
a relatively high surface area platinum (e.g., 20 m2/gm) in the form of
a carbon black with approximately 15 wt % platinum loaded on the
surface thereof.
(Id. at col. 8, ll. 13-28).
v. LaConti, U.S. Patent No. 4,820,386
34) LaConti is directed to a sensor cell for the detection of carbon monoxide and
other oxidizable or reducible gases. (LaConti, Abstract).
35) LaConti=s gas sensor is a three-electrode hydrated proton-conducting
membrane cell having sensing, counter and reference electrodes. (Id. at col. 2, ll.
28-40).
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