Appeal No. 1996-1566
Application No. 08/095,369
silicon composition. See column 5, lines 44-49 and column 6,
lines 4-7. The Sumida composition contains a hydroxy end
blocked polydiorganosiloxane, a polyorganohydrogen siloxane
having at least three hydrogen atoms attached to the silicon
atom, and an organometallic catalyst as requisite components
of his invention. See column 4, line 57 through column 5,
line 13. These three components of Sumida interact in a
specific manner. The organometallic compound accelerates the
dehydrogenizing condensation reaction between the hydroxyl
radical on the hydroxy end blocked polyorganosiloxane and the
Si-H bond of the polyorganohydrogen siloxane. See column 4,
lines 56-61. We find no disclosure or suggestion in Sumida
that the organometallic compound in and of itself acts as a
condensation catalyst for hydroxyl end blocked
polyorganosiloxane in the absence of polyorganohydrogen
siloxane. Accordingly, we conclude that there is no rationale
or motivation to add the organometallic compound of Sumida to
the composition taught by Endo as suggested by the examiner.
As for Murphy, we find that patentee is directed to
vulcanized organopolysiloxane molding compositions and methods
for their preparation. The resulting elastomeric polymers are
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