MOTHER-DAUGHTER SECURITY ALARM SYSTEM WITH DIRECTION INDICATION MEANS
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United States of America Patent
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Issued Date -
Nov 27, 2008
app pub date -
May 24, 2007
filing date -
May 24, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A mother-daughter security alarm system in which the mother unit has multiple directional antennas arranged in different directions, and a display for displaying the moving direction of the daughter unit subject to the result of a comparison procedure to compare the value of the signal received from the daughter unit through one directional antenna with the value of the signal received from the daughter unit through another directional antenna so that the user of the mother unit can search the location of the daughter unit rapidly subject to the directional indication of the display.
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Family
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