Patents Assigned to William B. Spargur
  • Anti-theft detection system
    Patent number: 5990791
    Abstract: An anti-theft detection system. A target comprising a frequency multiplier is affixed to goods in a retail store. A low power radio frequency source is placed near the exits to the retail store, and the target emits harmonics of the frequency transmitted by the radio frequency source when located near the radio frequency source. A detector also located near the exits to the retail store detects the harmonics and commands an alarm, thereby allowing for an apprehension of shoplifters.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: November 23, 1999
    Assignee: William B. Spargur
    Inventors: Howard P. Andreasen, William B. Spargur