Interference No. 103,036
In this embodiment, a first piece of L-shaped sheet
metal (23) is tightly fitted in a slot in the carbon electrode
(21) such that its upper end protrudes through pitch seal (22)
and is exposed at the outer surface of that pitch seal. A second
L-shaped piece of sheet metal (24) is attached to the interior of
the zinc can and extends out of the cell through the pitch seal
(22) adjacent to, but out of contact with, the first piece (23).
The exposed edges of the sheet metal pieces (23 and 24) define a
space (25) analogous to the space (8) in the first embodiment.
The carrier for the indicator is shown at 26 and is attached to
the carbon electrode by a fastener (27). The carrier has a color
chart (28) and an interpretative chart (29) printed on its
surface. The part of the carrier that overlies space (25) is
impregnated with an indicator such as phenolphthalein. To test
the cell, the phenolphthalein impregnated spot (26) is moistened
and pressed down onto the exposed edges of elements (23 and 24).
The spot changes color in response to the magnitude of the
battery voltage and a comparable color is selected from chart
(28) and interpreted at chart (29).
Sterling fails as an anticipation of the claimed
invention of the party Burroughs et al. in that Sterling does not
disclose the particular indicating device or the particular
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