Appeal No. 1998-2265
Application No. 08/498,482
wherein said precipitation heat treating is
conducted at a temperature of 730-800EC for 1-2
hours, and
said alloy 718 consists essentially of, in
percent by weight:
Cr 17 to 21; Fe 16.5 to 20.5; Nb + Ta 4.75 to
5.5;
Mo 2.8 to 3.3; Ti 0.75 to 1.15; Al 0.3 to 0.7;
C 0.02 to 0.08; Mn below 0.35; Cu below 0.3; Co
below 1;
B below 0.006; P below 0.015; S below 0.015;
Si below 0.35; Bi below 0.0001; Ag below 0.0005;
Pb below 0.001; and Ni as the remainder.
The examiner relies upon the following prior art
reference as evidence of unpatentability:
Daniel A. DeAntonio, David Duhl, Timothy Howson, and Michael
F. Rothman, Heat Treating of Superalloys, in 4 ASM HANDBOOK
793-814 (Steven R. Lampman, Theodore B. Zorc, Janice L.
Daquila, Alice W. Ronke, Kari L. Henniger, Robert T. Kiepura,
Heather F. Lampman, Penelope Thomas & Nikki D. Wheaton eds.
1990) (ASM Handbook).2
2Notwithstanding the statement on page 3 of the
examiner’s answer that “[n]o prior art is relied upon... in
the rejection of the claims under appeal” (p. 3), the examiner
refers to the ASM Handbook in the rejection (p. 4) and in the
“Response to argument” section (p. 6).
3
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