Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-01-25
1981-09-01
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250214AL, 340628, G08B 2100, G08B 1710
Patent
active
042875170
ABSTRACT:
A battery-operated smoke alarm includes an alerting signal means for indicating when the battery voltage is low by comparing a first signal which is a function of the battery output voltage with a relatively fixed reference signal and producing an alerting signal when the first signal is less than the reference signal. Means are provided for squelching the low battery voltage alerting signal for the first several nights after the onset of the low battery voltage condition by incorporating photosensitive means in the generating circuit for either the first signal or the reference signal for shifting the level of that signal away from the other signal under dark conditions.
REFERENCES:
patent: 3811123 (1974-05-01), Hamm et al.
patent: 3899732 (1975-08-01), Staby
patent: 4004288 (1977-01-01), Webb, Jr.
patent: 4084156 (1978-04-01), Wittlinger
patent: 4086525 (1978-04-01), Ibsen et al.
patent: 4112310 (1978-09-01), Malinowski
Practical Electronics; vol. 12, No. 5; p. 421; May 1976.
Radio and Electronics Constructor; vol. 29, No. 3; pp. 174-175; Oct. 1975.
Radio and Electronics Constructor; vol. 30, No. 8; pp. 475-477; Mar. 1977.
Caldwell Sr. John W.
Myer Daniel
Pittway Corporation
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