Appeal No. 97-1489
Application No. 08/478,158
1. A radome comprising:
(a) an exterior wall, said wall including:
(i) a central region of porous material comprising a
ceramic material impregnated with an inorganic resin and
having a pair of opposing exterior surfaces; and
(ii) a skin overlying each of said opposing surfaces
to form a composite structure, said 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 1200°F;
(b) the flexure strength of said wall being at least
about 5000 psi through a temperature range up to about 2000°F;
(c) said wall being free of elemental carbon formation at
temperatures up to about 2000°F.
The references relied upon by the examiner are:
Boyd et al. (Boyd) 5,134,421 Jul. 28, 1992
Liimatta et al. (Limatta) 5,198,152 Mar. 30, 1993
The sole issue on appeal is whether the examiner properly2
rejected claims 1 and 21-39 under 35 U.S.C. § 103 as being
unpatentable over the combination of Boyd and Liimatta.
2 Claims 1 and 21-39 were also provisionally rejected
under the judicially created doctrine of obviousness-type
double patenting as being unpatentable over claims 1-19 and 21
of copending Application 08/273,040. However, appellants
filed a terminal disclaimer, and the rejection was withdrawn
(see Supplemental Examiner's Answer).
2
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