Appeal No. 1998-2409
Application 08/398,259
rejection of claims 1, 3-6, 9-16, 18 and 20 and reverse the
rejection of claims 2, 7, 8, 17 and 19.
Rejection over Osozawa in view of McGill
Osozawa discloses a Ni-based alloy which, Osozawa states, is
“excellent in intergranular corrosion resistance, stress
corrosion cracking resistance, mechanical strength and hot
workability” (col. 1, lines 9-12). Osozawa teaches that when the
alloy contains neither B nor Mg, the hot workability is markedly
lowered when the S content is higher than 0.0010% (10 ppm)
(col. 2, lines 46-49). The lowest exemplified alloy sulfur
contents are 6 ppm in an example of the invention (table 1, alloy
no. 3), and 4 ppm in a comparative example (table 1, alloy
no. 12). Osozawa does not indicate whether the disclosed sulfur
content is free sulfur, sulfur which is chemically combined with
one or more elements, or total sulfur. Thus, it is not apparent
whether Osozawa’s alloy has a free sulfur content within the
range recited in appellants’ claims.
McGill discloses an article suitable for use at temperatures
up to 1600°C comprising a metallic substrate having thereon a
coating or layer including one or more of the platinum group
metals or an alloy including one or more of the platinum group
metals, on which is deposited a ceramic thermal barrier layer
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