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Loss prevention system

  • US 8,680,999 B2
  • Filed: 11/17/2011
  • Issued: 03/25/2014
  • Est. Priority Date: 12/13/2010
  • Status: Expired due to Fees
First Claim
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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.

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