Chemistry: electrical current producing apparatus – product – and – With measuring – testing – or indicating means – For charge or liquid level
Patent
1990-05-03
1992-07-21
Hearn, Brian E.
Chemistry: electrical current producing apparatus, product, and
With measuring, testing, or indicating means
For charge or liquid level
429 54, H01M 1048
Patent
active
051321769
ABSTRACT:
In combination with an electric storage battery having a container and a cover, and having a plurality of walls for enclosing the electrolyte and other electrochemical components of the battery, a state of charge indicating device for monitoring the concentration of the electrolyte during the charge and discharge cycles of the battery. The indicating device is made of a porous solid support and an acid concentration sensitive dye which exhibits a change in color in accordance with the acid concentration of the electrolyte. The indicating device also includes a viewport located in one of the walls of the battery for viewing the color of the dye. The color may then be correlated to a reference scale to determine the state of charge of the battery.
REFERENCES:
patent: 2331450 (1943-10-01), Baum
Eggers Mark L.
Fiedler Allen F.
Szymborski Joseph
Valentine Theodore W.
GNB Industrial Battery Company
Hearn Brian E.
Nuzzolillo M.
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