Appeal No. 1996-3496
Application No. 08/167,288
Claims 1 and 8 are representative of the subject matter
on appeal and read as follows:
1. A process for the production of a powdered ceramic
material which comprises feeding a mixture comprising carrier
particles of an inert material having a particle size of from
about 3 to 30 mm and a precursor of the ceramic material in
the form of a powder having an average particle size smaller
than about 65 microns in a weight ratio of carrier to
precursor of from about 3:1 to about 15:1 into a rotary kiln
and firing at a temperature sufficient to effect conversion of
the precursor to the ceramic material.
8. A process for producing alpha alumina in the form of
a powder with an average particle size of from about 5 to
about 40 microns which comprises feeding a mixture comprising
a powder of
a transitional alumina with a particle size less than about 65
microns and carrier particles of alpha alumina with an average
particle size of from about 6 to 15 mm, in a carrier to powder
weight ratio of from 5:1 to about 10:1, into a rotary kiln
maintained at a temperature above the conversion temperature
of the precursor [sic, transitional alumina] to alpha alumina
and thereafter separating [sic, the resulting] alpha alumina
powder from the carrier particles.
As evidence of obviousness, the examiner relies on the
following prior art:
Koppers 1,712,082 May 7,
1929
Clark 3,275,405 Sep. 27,
1966
Shabaker 3,630,501 Dec. 28,
1971
11..." in the first page of the Brief is inadvertent.
Clearly, claims 10 and 11 do not exist in this application.
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