Personal alarm

Details Personal alarm Personal alarm

1985-10-30

1988-01-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340689, G08B 1300

Patent

active

047194545

ABSTRACT:
A portable personal alarm which has a small size and achieves high sound levels utilizes the overdriving of a miniature buzzer. In order to reduce the likelihood of damage to the buzzer and create a more terrifying and noticeable sound, the alarm tone is pulsed.

REFERENCES:
patent: 3740648 (1973-06-01), Grotjahn
patent: 4151520 (1979-04-01), Full
patent: 4189721 (1980-02-01), Doell
patent: 4253095 (1981-02-01), Schwarz et al.
patent: 4335377 (1982-06-01), Bostic
patent: 4404549 (1983-09-01), Berg
patent: 4520351 (1985-05-01), Altman et al.

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