Rolling code security system

  • US 6,810,123 B2
  • Filed: 08/09/2002
  • Issued: 10/26/2004
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A transmitter comprising:

  • an oscillator for generating a radio frequency oscillatory signal;

    a source of a sequence of binary codes, successive binary codes in the sequence being different from predetermined preceding binary codes in the sequence;

    trinary code generator for converting said sequence of binary codes to a sequence of trinary codes; and

    a transmitting apparatus for modulating the radio frequency oscillatory signal with the binary codes to produce a modulated trinary coded radio frequency signal.

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