Interference No. 103,036
between said first and second
nonconductive layers, the
conductive layer reduced to a small
cross-sectional area [65] in the
chamber; and (d) a heat sensitive
color indicating material [70] in
said sealed chamber that is adapted
to undergo a color change when its
temperature exceeds or crosses a
predetermined value, said
conductive layer in the chamber
rising to a predetermined
temperature when the voltage of the
current flowing therethrough
exceeds a predetermined value.
The battery strength indicator is attached to
the side of a dry cell battery [18] in
accordance with Fig. 2 and the disclosure at
column 6, lines 15-29. The housings of both
the nonrechargeable alkaline and zinc-carbon
dry cell batteries disclosed in the '544
patent at column 11, line 42 and column 12,
line 63 are electrically conductive. The
heat sensitive color indicating material [70]
is above the conductive layer reduced area in
the sealed chamber in accordance with the top
plan view shown in Fig. 10. Pyrotechnic
chemical 68 is not shown in accordance with
the alternate embodiment disclosed at column
8, lines 62-66. The current and heat flow as
shown in Fig. P-1 above are disclosed at
column 8, lines 45-54 and 62-66.
21. In my opinion, the current and
heat flow model shown in Fig. P-1 is the
necessary and only reasonable construction
which one of ordinary skill in the battery
art would give to this embodiment of the
strength or voltage indicator disclosed in
the Burroughs '544 patent. As I believe
would be recognized by one of ordinary skill
in the battery art, nonconductive layers 30
and 32 would be inherently recognized as
having both sufficient thermal
nonconductivity and sufficient electrical
-36-
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