Title: A.C. powered detecting device with battery backup

Abstract: An improved a.c. voltage powered warning device for detecting the occurrence of predetermined phenomena, is characterized by battery backup for providing power to the device in the event of interruption of the a.c. voltage. In the disclosed embodiments the warning device is a fire detector having circuitry for supervising the energy level of the backup battery and for providing a warning upon the energy level decreasing to a predetermined value, and for testing a combustion detecting and alarm generating portion of the detector.

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Inventors: Schneider, Quentin L. (Bensenville, IL, US)
Schwarzbach, Richard J. (Naperville, IL, US)

Application Number: 756494
Filing Date: 1977-01-03
Publication_date: 1979-02-06
Assignee: Pittway Corporation (Northbrook, IL)
Primary Class(es): 340/507 340/333, 340/509, 340/511, 340/628, 340/629, 340/636.1, 340/636.15, 340/693.2
Other Classes:
US Patent Ref:

3728706	Apr, 1973	Tipton et al.	340/237.
3811123	May, 1974	Hamm et al.	340/249.
3899732	Aug, 1975	Staby	340/249.
3955186	May, 1976	Green et al.	340/237.
3980997	Sep, 1976	Berns et al.	340/237.

Other Refs:
Primary Examiner: Yusko, Donald J.
Assistant Examiner: Myer, Daniel
Attorney: Gary, Juettner & Pyle