Appeal No. 1999-1942
Application 08/770,037
an oxide) throughout the material and does not disclose adding
anti-tracking additive only to an outer insulating layer
(Br13-15; RBr4-5).
It is noted that, as disclosed with respect to the
preferred embodiment of figure 8, the "mica tape 20 containing
the submicron oxide particles 19 forms the inner groundwall
layers 15b adjacent or near the tiers of conductor strands 12,
while the unfilled tape 16 preferably forms the outer
layers 15a of the groundwall insulation" (specification,
p. 10, lines 7-11). This embodiment, if claimed, would
clearly overcome the Examiner's reasons which are completely
dependent on the oxide-containing tape being on the outside
layer to prevent tracking. However, since at least the
independent claims do not recite the order of layers, and
since it is possible for the oxide layer to be on the outside
(Appendix B, Example #11), the order of the layers is not
considered.
Penneck discloses an electrically insulating material
which comprises one or more polymers and an "anti-tracking
filler system" comprising (a) a hydrate of alumina having a
specific surface area, and (b) a compound from a group
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