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REMOTE ALARM SYSTEM

  • US 3,703,714 A
  • Filed: 08/17/1970
  • Issued: 11/21/1972
  • Est. Priority Date: 08/17/1970
  • Status: Expired due to Term
First Claim
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1. In a remote alarm system, a portable remote radio transceiver for transmitting and receiving electromagnetic wave signals propagated through the atmosphere, said remote transceiver being small enough to be carried about on one'"'"''"'"'s person, a stationary radio transceiver operatively tuned to receive from and to transmit to said remote radio transceiver electromagnetic wave signals propagated through the atmosphere, said stationary transceiver being situated at an installation which is to be protected against unauthorized access, a source of electrical energy operatively connected to said stationary transceiver, means at said remote transceiver for activating and deactivating said stationary transceiver, means operatively connected to said stationary transceiver and to said installation for responding to an attempt at unauthorized access to said installation to transmit a signal from said stationary transceiver to said remote transceiver, and means at said remote transceiver for giving an alarm when said remote transceiver receives said signal.

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