Electrically-energized horn

Details Electrically-energized horn Electrically-energized horn

1980-01-15

1982-01-12

Waring, Alvin H.

Communications: electrical

Audible indication

Ultrasonic pest control

340 63, 340388, G08B 300

Patent

active

043108334

ABSTRACT:
An electrically-energized horn is provided which is particularly suited for use in fire alarm and burglar alarm systems, and which includes a built-in solid state electronic drive circuit including a timer network for de-energizing the horn a predetermined time after it has been activated.

REFERENCES:
patent: 3432849 (1969-03-01), Earling
patent: 3890612 (1975-06-01), Sweany et al.
patent: 3931549 (1976-01-01), Berns et al.
patent: 4065767 (1977-12-01), Neuhof et al.
patent: 4195284 (1980-03-01), Hampshire et al.

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