×

Coded information arrangement

  • US 4,399,437 A
  • Filed: 05/19/1981
  • Issued: 08/16/1983
  • Est. Priority Date: 05/19/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. An active transponder device comprising first signal receiving means for receiving an input signal including coded information, a memory for storing said information, transmitter means for transmitting an output signal including said information, second signal receiving means and a program protection circuit, said program protection circuit being connected to receive signals from said first and second signal receiving means and being further connected to said memory, and said program protection circuit comprising means responsive to a predetermined time relationship between respective signals received from said first and second signal receiving means to enable the memory for storage of said coded information.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×