Appeal No. 97-1489
Application No. 08/478,158
Discussion
Claim 1 is directed to a radome comprising an exterior
wall including, in part:
(1) a central region of porous material comprising a
ceramic material impregnated with an inorganic resin and
having a pair of opposing exterior surfaces; and
(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; Paper No. 5,
p.2):
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
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Last modified: November 3, 2007