Interference No. 103,036
The color changing point of the
thermochromic material will have an effect on
the overall design of the tester mechanism.
Those are the two biggest factors in regards
to the tester mechanism itself.
Q. Will the thickness of the insulation also
have an effect?
A. Yes.
As explained by the party Burroughs et al. on pages 132
and 133 of its opposition brief,
In the heat sensitive indicator
embodiment of Fig. 10 (summarized at column
4, lines 21-38 and described further at
column 8, line 26 through column 9, line 3),
nonconductive layers 30 and 32 are located
above and below the conductive layer 64 and
the reduced cross section area 65 in
indicator zone 66. Heat generated by the
current through the reduced cross section
area 65 of the conductive layer is described
as raising the temperature of color
indicating, heat sensitive material 70 to
cause material 70 to undergo a visible color
change when the battery has a predetermined
minimum voltage output. The indicator device
shown would not function without shielding
provided by some type of nonconductive
(either electrically or thermally) layer if
applied to an electrically conductive portion
of a dry cell battery housing as described.
The natural result of the use of the
nonconductive layer 30 or 32 below the
conductive layer 64 and reduced area 65 is to
permit the heat generated by the conductive
layer to change the color of the temperature
sensitive color indicator material and
indicate voltage when the voltage indicator
is in contact with the battery housing.
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