Appeal No. 2002-0190
Application No. 09/149,018
OPINION
We reverse the aforementioned rejections. We need to
address only the independent claims, i.e., claims 1 and 17.
Rejection of claim 1
McMordie discloses a method for preparing an article having
a substrate protected by an overlying coating (abstract),
comprising furnishing a substrate comprising a nickel-base
superalloy (col. 5, lines 23-25; col. 9, lines 25-28), then
depositing a first layer comprising platinum contacting an upper
surface of the substrate (col. 7, lines 12-35), and then
depositing a second layer comprising aluminum and silicon onto an
upper surface of the first layer, leaving an exposed surface
(col. 6, lines 23-32; col. 7, lines 36-63; col. 8, lines 53-65).
“The aluminum-rich layer is heated in a non-reactive environment
to a diffusion temperature above about 660ºC., which is
sufficient to melt the aluminum powder, which in turn can
dissolve the silicon and any other metallic powders. For nickel
-base alloys, this diffusion temperature should be fixed above
about 870ºC. (1600ºF). Suitable non-reactive environments in
which the diffusion may be performed include vacuums and inert or
reducing atmospheres” (col. 8, line 66 - col. 9, line 9).
coating (page 2, lines 9-15).
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