×

Proximity alert and direction indicator

  • US 5,557,259 A
  • Filed: 04/10/1995
  • Issued: 09/17/1996
  • Est. Priority Date: 04/10/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A proximity alert and direction indicator comprising:

  • a. radio transmitter means worn on the shoe of a subject under surveillance, said transmitter means being attached by hook and pile type fastener material to permit said transmitter means to be removed and located on the back of the shoe adjacent the heel;

    b. a bracelet worn on the wrist of an observer, said bracelet carrying direction finding radio receiver means to receive a radio signal issued by said transmitter means;

    c. proximity detector means connected to said receiver means to output an alarm signal when the distance between said transmitter means and said receiver means exceeds some preset value, and including means for adjusting said preset value; and

    d. transducer means connected to said proximity detector including speaker means to issue an audible alarm to said observer when said alarm signal is received.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×