Interference No. 103,036
conductive layer with a reduced cross-sectional area
to generate heat and, over it, a heat sensitive,
color indicating material which changes color when it
reaches a predetermined temperature due to heat flow
from the conductive layer reduced cross-sectional
area. Below the conductive layer there appears to be
a thin nonconductive layer of ink or paint of less
than 0.5 mil thickness. The strip tester was
attached to the side of the Eveready battery by tape
applied at the edges, with no gap apparent between
the side of the battery and the strip tester. I then
electrically connected the ends of the strip tester
across the terminals of the battery and observed that
heat generated by the conductive layer reduced cross-
sectional area caused the heat sensitive color
indicating material to change color to indicate the
strength of the battery. The device was operable as
attached to the side of the battery without any
special precautions taken to provide thermal
insulation or otherwise prevent heat sinking to the
battery housing.
76. I repeated the experiment by substituting
Energizer alkaline and Duracell alkaline dry cells
forthe Eveready battery as described above. I
received similar results, indicating operability
ofthe device without any special precautions taken to
provide thermal insulation or otherwise prevent heat
sinking to the battery housing.
77. Accordingly, I believe that one of ordinary
skill in the battery art would be able to make and
use the invention described by the Burroughs reissue
claims. I further believe that the invention is
adequately disclosed and supported in the Burroughs
'544 patent and conveys with reasonable clarity to
one skilled in this art that Burroughs et al. were in
possession of the heat sensitive indicator embodiment
described therein.
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