Appeal No. 97-1417
Application No. 08/273,040
(2) a skin overlying each of the opposing surfaces
whereby the skin comprises a 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.
The inorganic resin is preferably a polysilazane or a
polysiloxane (Specification, p.3).
According to the examiner (Answer, p.3):
Boyd et al discloses a radome comprising a honeycomb
or foam layer laminated with face sheets of resin
impregnated-fiber reinforced material and the use of
ceramic materials for these layers; see column 2,
lines 18-40 and the paragraph bridging columns 5 and
6. However, Boyd et al do not disclose the
particular claimed materials used to form the fiber
reinforced layers . . . . Liimatta et al discloses
the use of polysilizane [sic, polysilazane]
materials as an infiltrant in ceramic fiber
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, p.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
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