Appeal No. 2002-2142 Page 3
Application No. 09/276,858
solidifying said molten nickel base superalloy in a mold to form said
single crystal casting.
9. A method of reducing as-cast metallic surface scale formed on a single crystal
casting made by solidifying a molten nickel base superalloy that includes Cr, Co,
Mo, W, Ta, and Al, comprising
providing said nickel base superalloy with a C concentration controlled in
accordance with the equation,
% area fraction scale = -0.193 X carbon content in ppm + 86 effective to
substantially reduce formation of said as-cast metallic scale when the superalloy is
solidified as a single crystal, casting, and
solidifying said molten superalloy in a mold to form said single crystal
casting.
THE EVIDENCE
As evidence of unpatentability, the Examiner relies upon the following prior art
reference:
Wukusick et al. (Wukusick) 5,100,484 Mar. 31, 1992
THE REJECTIONS
Claims 1-20 stand rejected as follows: under 35 U.S.C. § 102(b) as being anticipated by
Wukusick (Answer at 4-5) and under 35 U.S.C. § 103(a) as being unpatentable over Wukusick
(Answer at 5-6).
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