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Portable personal electronic perimeter alarm

  • US 4,998,093 A
  • Filed: 12/16/1988
  • Issued: 03/05/1991
  • Est. Priority Date: 12/16/1988
  • Status: Expired due to Fees
First Claim
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1. A portable personal electronic perimeter alarm system comprising:

  • (a) a light beam emitter powered by a portable power source for emitting light beam, said light beam'"'"'s presence being constantly sensed by;

    (b) a photoelectric light beam detector in combination with an electronic amplifier/switch means used to control;

    (c) a radio transmitter powered by a second portable power source and operated by said control means so as to transmit a continuous signal whenever the light beam is being detected at said photoelectric light beam detector;

    (d) and a plurality of personal radio alarm receivers for receiving said signal, each having an alarm activated when any interruption of the radio transmitter'"'"'s signal causes said receivers to stop receiving said signal, whereby all users of the system carrying a said receiver are notified whenever the light beam is broken or any of several critical components of the system fail.

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