×

Electronic proximity identification system

  • US 4,546,241 A
  • Filed: 12/10/1982
  • Issued: 10/08/1985
  • Est. Priority Date: 12/10/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. An electronic identification system comprising:

  • a reader including means to generate, radiate and identify a carrier frequency signal; and

    an identification card having an electronic circuit and comprising;

    means to receive said carrier frequency signal radiated by said reader;

    means to generate power from said carrier frequency signal to energize said card electronic circuit;

    a counter to receive and generate secondary radio frequency signals by dividing said carrier frequency signal;

    a data memory for recording an identification code identifying said card;

    means to access said data memory and select said secondary radio frequency signals responsive to said identification code; and

    an antenna connected to receive and radiate said selected secondary radio frequency signals to said reader to allow said reader to identify said card.

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