Patents Assigned to The Chamberlain Group, Ltd.
  • Rolling code security system
    Publication number: 20040066936
    Abstract: A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.
    Type: Application
    Filed: September 29, 2003
    Publication date: April 8, 2004
    Applicant: The Chamberlain Group, Ltd.
    Inventors: Bradford L. Farris, James J. Fitzgibbon