Proximity alert system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 29, 1994
Grant Date -
N/A
app pub date -
Jan 17, 1992
filing date -
Jan 17, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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