Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-12-18
1993-09-14
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340572, 367 93, G08B 1322
Patent
active
052453170
ABSTRACT:
A method and system are provided for monitoring an item within a defined area and sounding an alarm if the item is removed from the area. A transmitter and transducers emit ultrasound which substantially saturates the area to be monitored. A security tag having a detector and alarm is attached to the items to be monitored within the area. Sensing circuits may be additionally provided to determine whether a security tag is being tampered with or removed by an unauthorized person. The security tag's alarm is sounded in the event that the receiver does not detect the ultrasound indicating that the monitored item is no longer in the monitored area. Additional alarms may be provided for indicating that the security tag has been tampered with or removed.
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Allen Paul J.
Chidley Duncan
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