Appeal 2007-1895
Application 10/719,489
col. 15, ll. 33-34, and col. 17, ll. 9-12). The viscosity of the
polydiorganosiloxane materials is from about 1,000,000 to about
100,000,000 centipoise (id. col. 3, ll. 51-56).
We agree with the Examiner’s findings of fact from Boudreau (see
above pp. 4-5) to which we add the following for emphasis. We find this
reference would have disclosed to one of ordinary skill in the art a process
for a process for compounding a catalyst containing silicone rubber
composition comprising forming a liquid organosiloxane composition by
blending a liquid polydiorganosiloxane and a filler in an extruder,
transferring the composition to a cooler for cooling, and homogenizing the
composition (Boudreau, e.g., Abstract, col. 1, ll. 53-63, col. 2, ll. 21-28).
The composition is batched processed in the extruder at a temperature range
of 160-210°C and the “[c]ooling . . . can be effected in a separate counter-
rotating mixer, which can provide back-mixing and a high residence time to
homogenize the material into a base,” after which a catalyst can be added
(id., e.g., col. 2, ll. 29-43, col. 2, l. 53, to col. 5, l. 18, Figs. 1 and 2, and
Examples). The viscosity of the polydiorganosiloxane materials is from
about 100 to about 2,000,000 centipoise (id. col. 3, ll. 1-4).
We determine the combined teachings of Bilgrien and Boudreau, the
scope of which we determined above, provide convincing evidence
supporting the Examiner’s case that the claimed invention encompassed by
claim 1, as we interpreted this claim above, would have been prima facie
obviousness of to one of ordinary skill in the silicone rubber compounding
arts familiar with the preparation of powder and liquid silicone rubber
compositions containing a catalyst.
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