Battery voltage detection and warning means

Details Battery voltage detection and warning means Battery voltage detection and warning means

1975-11-10

1977-06-14

Caldwell, John W.

Communications: electrical

Systems

Call station

340237S, G08B 1900, G08B 1710

Patent

active

040300862

ABSTRACT:
A battery operated smoke detector or the like is provided with means for monitoring the voltage of the battery and providing a warning when the voltage drops below a predetermined level. The detection and warning system includes means for sensing when the battery voltage has dropped below the predetermined level and producing periodic output signals in response thereto. A first alarm means produces a permanent warning signal in response to the first output signal, and a second alarm means produces periodic warning signals in response to the periodic output signals.

REFERENCES:
patent: 568608 (1896-09-01), Gibbs
patent: 2324618 (1943-07-01), Dietrich
patent: 3158713 (1964-11-01), Margulies
patent: 3548205 (1970-12-01), Ogden
patent: 3811123 (1974-05-01), Hamm et al.

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