Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-06-30
1979-02-13
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
340629, 340663, G08B 1900, G08B 1710
Patent
active
041398467
ABSTRACT:
Apparatus for supervising the energy level of a battery is characterized by circuitry for periodically loading the battery, monitoring the change in voltage across the battery from the condition prior to loading to during loading, and generating a signal whenever the change in voltage is at least equal to a predetermined magnitude. In one embodiment the apparatus is used with a fire detector powered by the battery, and the signal operates an alarm to indicate impending battery failure.
REFERENCES:
patent: 3899732 (1975-08-01), Staby
patent: 4024523 (1977-05-01), Arnold et al.
Caldwell Sr. John W.
Myer Daniel
Pittway Corporation
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