Proximity alert system

Details Proximity alert system Proximity alert system

1992-01-17

1994-03-29

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

455 89, 345 98, G08B 2300, H04B 138

Patent

active

052988830

ABSTRACT:
A proximity alert system including a pair of portable electronic, coded transmitter/receiver units designed to operate in a specific signal band. Each unit transmits a coded signal that is picked up by the other unit. The strength of the received coded signal controls the rate of an audible beeper. The rate of the beeper indicates the approximate distance between companion units. A direction-finder antenna is used to indicate the direction of the received coded signal.

REFERENCES:
patent: 3718896 (1973-02-01), Mowat
patent: 4628306 (1986-12-01), Root
patent: 4675656 (1987-06-01), Narcisse
patent: 4850031 (1989-07-01), Allsop et al.
patent: 4851820 (1989-07-01), Fernandez
patent: 4931772 (1990-06-01), Bechtold
patent: 4949072 (1990-08-01), Comerford et al.
patent: 4973944 (1990-11-01), Maletta
patent: 4978946 (1990-12-01), Nordholm et al.
patent: 5067441 (1991-11-01), Weinstein

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