Alarm system

Details Alarm system Alarm system

1973-08-06

1976-06-29

Trafton, David L.

Communications: electrical

Systems

Call station

250338, 340224, 340249, 340409, G08B 1318

Patent

active

039672581

ABSTRACT:
A system for detecting intruders in a building, using sets of light emitters and detectors. Interruption of a beam between an emitter and a detector produces a radio signal picked up by a control console. The system is easily installed because the emitters and detectors are battery powered, requiring no connection to house wiring, and the radio link between detectors and the control console avoids wiring for the signal circuit.

REFERENCES:
patent: 1992199 (1935-02-01), Gerald
patent: 2899674 (1959-08-01), Sierer
patent: 3329946 (1967-07-01), Robbins
patent: 3529164 (1970-09-01), Komatsubara et al.
patent: 3534351 (1970-10-01), Harnden et al.
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3618067 (1971-11-01), Devale et al.
patent: 3619629 (1971-11-01), Matthews
patent: 3631433 (1971-12-01), Dix
patent: 3725887 (1973-04-01), Sneider
patent: 3786460 (1974-01-01), Kaltenbach

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