52-58, Table 1, and column 5, lines 24-51. Moreover, we determine that the ceramic
prepolymer of the patentee and that of the claimed subject matter have little structural
similarity. Based upon the above findings and determination, we conclude that patentee
obtains different Si-C-B ceramics depending upon the initial polymer formed and the
decomposition conditions utilized. Moreover, the evidence is persuasive that the Si-C-B
ceramics differ substantially from each other depending on the starting materials and the
process conditions of pyrolysis.
As for Niebylski and Zank, we find that Niebylski discloses nitrogen containing
ceramic materials derived from polysilazanes. See column 1, line 12. The polymers protect
surfaces from oxidative degradation and generally provide protective ceramic coatings on
substrates. See column 3, lines 9-12, and 23-24. The preceramic polymers
are coated on a substrate and pyrolyzed to convert the coating to a ceramic. See column 3,
lines 49-55 and column 4, lines 11-16.
Zank is likewise directed to a nitrogen containing borazine modified polycarbosilane
polymers and ceramic polymers derived therefrom. See Abstract. Different ceramic yields
are obtained depending on the initial composition used. See Tables 1, 2 and 3. Based upon
the above findings, we determine that each of the precursor polymers prior to formation of the
ceramic contains nitrogen and have compositions substantially different from each other and
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