×

Anti-theft device with alarm screening

  • US 5,963,131 A
  • Filed: 08/04/1998
  • Issued: 10/05/1999
  • Est. Priority Date: 06/19/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. An anti-theft system comprising:

  • (a) a control unit having;

    a control transceiver capable of transmitting and receiving data signals; and

    an activation element coupled to the control transceiver and capable of directing the control transceiver to transmit an alarm signal representative of a command to activate an alarm; and

    (b) a theft detector having;

    a motion detector for generating a movement signal in response to a detected movement;

    a proximity transmitter coupled to the motion detector for transmitting, in response to the detected movement, a proximity signal having a known approximate near field proximity, to the control transceiver;

    an alarm; and

    a detector transceiver coupled to the motion detector and the alarm for providing bi-directional transfer of data signals, the detector transceiver, in the absence of a confirmation signal from the control transceiver to indicate that the control unit is within the near field proximity, being capable of;

    (A) in a first mode, automatically activating the alarm to indicate that an article to which the theft detector is coupled has moved, or(B) in a second mode, (i) transmitting to the control transceiver an alert signal in response to the movement signal, and (ii) activating the alarm in response to the alarm signal received from the control transceiver, which alarm signal may be generated by a user triggering the activation element of the control unit in response to the alert signal, to indicate that security of the article has been compromised.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×