Appeal No. 1999-1942
Application 08/770,037
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 1-16, 19, and 20. Claims 17 and
18 have been objected to.
We reverse.
BACKGROUND
The invention relates to an insulation material suitable
as groundwall insulation for a high voltage generator stator
bar. The insulation material is formed of layers of
resin-rich sheet material, wherein at least one of the layers
is formed by a sheet material containing submicron oxide
particles while at least one other is free of such oxide
particles. The combination provides better voltage endurance
performance than possible if the ground insulation is formed
by only one of the material layers.
Claim 1 is reproduced below.
1. An electrical insulating material comprising at
least first and second insulating layers, the first
insulating layer comprising:
a mica paper having first and second surfaces on
opposite sides of the mica paper;
a woven fabric on the first surface of the mica
paper;
a resin composition permeating the woven fabric and
bonding the woven fabric to the mica paper; and
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