Patent ID: 8680999
Filing Date: 2014-03-25
Classification: G08B,Y10T

Abstract:
1. A loss prevention system comprising: a protected article comprising a transmitter that emits an infrared signal, the infrared signal having a carrier frequency that is modulated to encode a digital signature, the protected article being located in a room; and a receiver that detects infrared signals, the receiver mounted at a fixed position within the room, the receiver performing an alarm action if the receiver does not detect within a rolling time window an infrared signal having the carrier frequency that is modulated to encode the digital signature; and a second protected article, the second protected article comprising a second transmitter that emits a second infrared signal, the second infrared signal having a second carrier frequency that is modulated to encode a second digital signature, the second protected article located in the room; wherein the receiver performs the alarm action if the receiver does not detect within a second rolling time window an infrared signal having the second digital signature.