Communications: electrical – Systems – Audible signals
Patent
1990-08-22
1993-10-19
Crosland, Donnie L.
Communications: electrical
Systems
Audible signals
340321, 340574, 340693, 340692, 340534, 340528, 340543, G08B 300, G08B 2300
Patent
active
052549704
ABSTRACT:
A personal alarm device having programmable deactivating, apparatus. The device includes a keypad by which a personal numerical code can be entered. This code is the only manner by which the alarm of the device can be shut off once activated. The code can be changed only by a user knowing the previously-entered deactivation code.
REFERENCES:
patent: 4114147 (1978-09-01), Hile
patent: 4189719 (1980-02-01), Massa et al.
patent: 4404549 (1983-09-01), Berg
patent: 4520351 (1985-05-01), Altman et al.
patent: 4667183 (1987-05-01), Gaudio
patent: 4833456 (1989-05-01), Heller
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