Portable cellular alert system

Details Portable cellular alert system Portable cellular alert system

1996-12-06

1999-04-06

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

3404071, 379 37, 455 677, 455351, 455566, 455575, G08B 2300

Patent

active

058924477

ABSTRACT:
The claimed invention comprises a personal warning system including a mobile transmitting device and a mobile receiving device including a receiver which receives signals transmitted by the transmitting device, a proximity device for providing a signal indicative of the proximity of the transmitting device and an alarm, communicating with the proximity device, for providing warning of the proximity of the transmitting device.

REFERENCES:
patent: 3478344 (1969-11-01), Schwitzgebel et al.
patent: 4785291 (1988-11-01), Hawthorne
patent: 5218344 (1993-06-01), Ricketts
patent: 5283546 (1994-02-01), Scop et al.
patent: 5289163 (1994-02-01), Perez et al.
patent: 5396227 (1995-03-01), Carroll et al.
patent: 5557259 (1996-09-01), Musa
patent: 5587701 (1996-12-01), Hess

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