Keyless entry system using a rolling code

Details Keyless entry system using a rolling code Keyless entry system using a rolling code

1996-02-29

1997-02-04

Swarthout, Brent A.

Coded data generation or conversion

Code generator or transmitter

Transmitter for remote control signal

3408252, 3408253, 34082569, 34082556, G08C 1912

Patent

active

056003242

ABSTRACT:
A keyless entry system which employs an identification code for each transmitter, a key sequence number, and a rolling code generated by a polynomial equation ensure unauthorized access. The system provides for resynchronization in the event of battery replacement or power failure. The system accommodates activation of a transmitter and incrementation of the rolling code when it is out of range of the receiver. This system further accommodates replacement of lost or stolen keys with a higher priority key, which then prevents access by the lost or stolen transmitter.

REFERENCES:
patent: 4779090 (1988-10-01), Micznik et al.
patent: 4847614 (1989-07-01), Keller
patent: 4992785 (1991-02-01), Lewiner et al.
patent: 5060263 (1991-10-01), Bosen et al.
patent: 5068894 (1991-11-01), Hoppe
patent: 5204663 (1993-04-01), Lee
patent: 5365225 (1994-11-01), Bachhuber

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