Distance determination and alarm system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 26, 1997
Issued Date -
N/A
app pub date -
Dec 12, 1995
filing date -
Dec 13, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system has a plurality of transceiver units, including a parent unit and one or more portable and wearable child units, for generating an alarm when a child transceiver unit is more than a predetermined distance away from a parent transceiver unit. The distance is determined by the difference in the phase of a reference signal from the time it is transmitted on an rf signal by a parent unit, received and retransmitted by a child unit, and then received again by the parent unit.
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Family
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Cited Art Landscape
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