Rolling code security system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 31, 2012
Grant Date -
Jan 22, 2009
app pub date -
Jul 22, 2008
filing date -
May 17, 1995
priority date (Note) -
Expired
status (Latency Note)
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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.
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