Appeal No. 2000-1085
Application No. 08/980,349
powder doped with phosphorus as a substitute for tin oxide powder
doped with antimony. See page 2, line 25 to page 3, line 51.
The specifically prepared tin oxide powder doped with phosphorus
is said to have “a powder electrical resistance of less than 500
Scm, preferably less than 200 Scm, more preferably , less than
100 Scm.“ See page 3, lines 1-3. This powder is “a very fine,
transparent powder having superior electroconductive properties
as well as being safe to handle.” See the abstract.
Given these and other advantages taught in Okuda, we concur
with the examiner that it would have been prima facie obvious to
employ the specifically prepared tin oxide doped with phosphorus
taught in Okuda as the conductive layer material of the
conductive pigment of the type described in Bruckner or
Stahlecker. From the combined teachings of the applied prior art
references, one of ordinary skill in the art would have had a
reasonable expectation of successfully obtaining the advantages
indicated above by employing the specifically prepared tin oxide
doped with phosphorus as the conductive material for the
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