Appeal no. 97-1293
Application no. 08/281,812
A "char" upon decomposition of the preceramic organosilicon
polymer (col. 4, line 2).
The use of preceramic organosilicon polymers such as
polyvinylmethylsiloxane, among others (col. 4, lines 40-51).1
Sintering temperatures as high as 1600EC (Example 2).
With respect to the claimed invention, the reference does not teach:
Titanium diboride, in particular, as the ceramic powder.
A char wherein "the carbon is present in a least a stoichiometric
amount based on the silicon content".
Sintering temperatures greater than 2000EC.
3
A sintered body with a density greater than about 4.0 g/cm .
Yajima (US 4,289,720).
With respect to the claimed invention, the reference teaches:
A method of preparing a sintered ceramic body comprising the steps
of mixing ceramic powder and preceramic organosilicon
polymer to form a uniform mixture, shaping the uniform mixture
to obtain a handleable green body, and
By comparison, the present specification at p. 5, lines 3-14 indicates organopolysiloxane groups such as1
"MeViSiO" (i.e., methyl vinyl siloxane), among others, may be employed. Polymerization of that group by itself
would produce polyvinylmethylsiloxane.
4
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