Alarm system activated by buzzers

Details Alarm system activated by buzzers Alarm system activated by buzzers

1982-04-12

1985-05-28

Kreitman, Stephen A.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340541, G08B 1300, G08B 2500

Patent

active

045203490

ABSTRACT:
In alarm systems a central control unit has been activated by sensors at the entrances of a home. The sensors signal the central control unit through extensive wiring or by a radio transmitter at each entrance. In this invention the signalling is done by an inexpensive buzzer at each entrance providing a definite distinct sound to be identified. The central control unit in this invention is sensitive to be activated by the buzzer of a distant entrance but it is not activated by ordinary sounds in an unoccupied home.

REFERENCES:
patent: 3725892 (1973-04-01), Faltico
patent: 3838408 (1974-09-01), McMaster
patent: 3973250 (1976-08-01), Uffelman
patent: 4001805 (1977-01-01), Golbe
patent: 4160972 (1979-07-01), La Mell et al.
patent: 4191943 (1980-03-01), Bouchard et al.
patent: 4207559 (1980-06-01), Meyer
patent: 4309698 (1982-01-01), Lecuyer et al.
patent: 4417235 (1983-11-01), Del Grande
patent: 4446454 (1984-05-01), Pyle

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