Appeal No. 97-1489
Application No. 08/478,158
reinforced composites which may be used in radomes;
see column 1, lines 13-18 and 49-50, column 2, lines
65-67 and column 4, lines 42-49.
The examiner continues (Answer, pp.3-4):
Ii [sic, It] is the examiner's position that since
Liimatta et al disclose the same impregnate as that
disclosed by appellant, namely polysilizane [sic,
polysilazane], that the claimed property under
pyrolysis is inherent in the Liimatta et al
impregnate.
However, appellants argue that the polysilazanes in
Liimatta are not the same as those claimed. More specifically
(Brief, p.6):
Claim 1 requires a skin comprising a first cloth
of ceramic material impregnated with an inorganic
resin which, under pyrolysis, provides an elemental
carbon-free material and, with increased
temperature, gradually converts from the liquid
state to a resilient state and then to a solid state
by about 1200EF. Even further, nowhere in Liimatta
et al. is there a teaching or even a suggestion that
the materials taught therein are limited to those
"which, under pyrolysis, provides an elemental
carbon-free material and, with increased
temperature, gradually converts from the liquid
state to a resilient state and then to a solid state
by about 1200EF". [Emphasis added.]
Manifestly, the resins disclosed in Liimatta are organic.
According to Liimatta, the disclosed invention is directed to
(Abstract):
A crosslinkable preceramic composition suitable for
use as an infiltrant for porous ceramics, such as
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