Door activated burglar alarm utilizing time delay

Details Door activated burglar alarm utilizing time delay Door activated burglar alarm utilizing time delay

1979-09-24

1981-06-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340528, G08B 1308

Patent

active

042765455

ABSTRACT:
A door-activated burglar alarm incorporates a firing capacitor that is charged by a battery during the quiescent state of the alarm. The firing capacitor will provide an additional current to fire a buzzer when the alarm is triggered, even if the battery is weak. (Less current is needed to maintain the buzzer, once it is fired). One embodiment provides exit and entry delays.

REFERENCES:
patent: 3286250 (1966-11-01), Teitelbaum
patent: 3683346 (1972-08-01), Horton
patent: 3803576 (1974-04-01), Dobrzanski et al.
patent: 4114147 (1978-09-01), Hile
patent: 4122437 (1978-10-01), Petersen
patent: 4160972 (1979-07-01), La Mell et al.
patent: 4170005 (1979-10-01), Duke

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