Distance monitor especially for child surveillance
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 15, 1988
Grant Date -
N/A
app pub date -
Mar 6, 1987
filing date -
Mar 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Monitoring apparatus including an unmodulated radio-frequency transmitter carried by or affixed to the person to be monitored and receiver/monitor apparatus at a monitoring location for providing quantized visual and audible indicia based on received signal strength. The receiver AGC level, being a function of received signal strength, provides the variable which determines the repetition rate of tone bursts and the number of LED bar visual indicia lighted within an array of such LED bars. The response levels of those indicia are then a function of the distance between transmitter and receiver. Movement of the child (for example) beyond a predetermined range is immediately detected by a person at the receiver location. Circuitry is provided for presetting the maximum allowable range before alarm is instituted.
First Claim
Family
International Classification(s)
Cited Art Landscape
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