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Antitheft system and monitoring system

  • US 6,304,181 B1
  • Filed: 10/18/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 10/20/1998
  • Status: Expired due to Term
First Claim
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1. An antitheft system comprising:

  • a notifying signal generator for producing a notifying signal, an alarm unit to be attached to an article to be prevented from being stolen and comprising an electronic buzzer, signal receiving means for receiving the notifying signal from the signal generator, and first control means for operating the electronic buzzer upon the signal receiving means receiving the notifying signal, and an alarm device comprising alarm means capable of producing an alarm, electromagnetic wave receiving means for receiving electromagnetic waves generated by the electronic buzzer by operating the electronic buzzer, and second control means for operating the alarm means upon the electromagnetic wave receiving means receiving the electromagnetic waves.

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