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Wireless authentication system

  • US 20040242201A1
  • Filed: 06/28/2004
  • Published: 12/02/2004
  • Est. Priority Date: 12/28/2001
  • Status: Abandoned Application
First Claim
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1. A wireless authentication system comprising a signal transmitting device and a use restriction releasing device, and having functions for restricting use of an appliance to which it is applied, wherein the signal transmitting device comprises:

  • a first transmitter for transmitting a prescribed first code signal at a prescribed intensity, by means of a radio signal;

    a first receiver for receiving a prescribed second code signal transmitted by said use restriction releasing device by means of a radio signal; and

    a first judging section for outputting a warning signal, if the signal level of said second code signal received by said first receiver is less than a prescribed value;

    said use restriction releasing device comprises;

    a second transmitter for transmitting said second code signal at a prescribed intensity, by means of a radio signal;

    a second receiver for receiving said first code signal transmitted by said first transmitter, by means of a radio signal; and

    a second judging section whereby a use restriction releasing signal for releasing the use restriction of said appliance to which the system is applied is transmitted to said appliance, if said first code signal received by said second receiver is the identification signal for that appliance, and if the signal level of said first code signal is equal to or greater than a prescribed value, and whereby the transmission of said use restriction releasing signal is halted if said signal level is less than said prescribed value.

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