Appeal No. 1997-0823
Application 08/403,946
THE INVENTION
Appellants claim a method for making a ceramic mold.
Claim 19 is illustrative and reads as follows:
19. A method of making a ceramic mould for the casting
of an article, which comprises:
a) providing a wax-based pattern of the article to be
cast;
b) forming a contact layer on said pattern;
c) providing a preparation mould for defining an outer
shape of the casting mould to be made;
d) placing the pattern having the contact layer thereon
in said preparation mould to define a cavity between said
pattern and said preparation mould;
e) introducing into said cavity a ceramic slip having a
composition which expands and fills said cavity and adheres to
the contact layer on said pattern;
f) removing the pattern and adhered ceramic slip from
the preparation mould after from about 5 to 30 minutes;
g) eliminating the wax-based pattern to leave a casting
mould formed by the contact layer and adhered ceramic slip;
and
h) firing said casting mould to strengthen said mould
by sintering.
THE REJECTION
Claims 19-28 stand rejected under 35 U.S.C. § 112, first
paragraph, enablement requirement.
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