Appeal 2007-0128
Reexamination Control 90/006,208
Patent 5,573,648
First, carbon powders on which 10-25% by weight of a platinum
catalyst was supported were mixed with carbon powders subjected to
water repelling treatment with addition of 25-70% by weight of PTFE.
The resulting mixed powders for catalyst layer were sprinkled on a
carbon paper to which 20-60% by weight of a fluoropolymer was
added and this carbon paper was hot pressed at 340o - 380o C. under a
pressure of 5-20 kg/cm2 to make an electrode.
Addition of the solid polymer electrolyte to this electrode was carried
out by coating a solution prepared by mixing 2 ml of isopropyl
alcohol with 0.05-1.5 g of Nafion solution on the catalyst layer with
being sucked from the carbon paper side by a pump and drying the
coat. The thus produced electrodes were bonded to a solid polymer
membrane in the same manner as in Example 1 to make cell X.
(Id. at col. 7, line 55 to col. 8, line 7).
27) Uchida claims 1-18 and 21 recite or depend from claims that are directed to
fuel cells and their manufacture.
28) Uchida claims 19 and 20 make no mention of Afuel cells@ and instead are
directed towards a Asolid polymer electrolyte membrane and electrode assembly.@
(Uchida, claim 19 and 20 preamble).
iv. Vanderborgh, U.S. Patent No. 4,804,592
29) Vanderborgh describes electrodes for use in electrochemical cells with the
electrode comprising an ion conducting material, an electron conducting material
15
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