Appeal No. 2006-3182
Application No. 09/883,963
of a motor vehicle (V). First, upon sensing the presence of a user’s badge (2), the vehicle
transponder (6) transmits a radio frequency (RF) interrogation signal, which carries a pseudo
random code previously stored in a circular shift register (7) of the automobile. Upon receiving
the pseudo random code, a de-spreader (14) located on the user’s badge (2) synchronizes it with
a corresponding pseudo-random code stored in the user’s badge memory (13) by a time shift less
than required for an intermediate transmission means to intercept and retransmit the interrogation
signal. The transceiver (12) in the user’s badge (2) subsequently transmits to the vehicle
transponder (6) an RF response signal, which carries a pseudo-random code and a signature that
uniquely identifies the user. Upon receipt of the response signal, a de-spreader (8) located on the
vehicle synchronizes it with a corresponding pseudo-random code stored in the memory of the
vehicle (7) by a time shift less than required for an intermediate transmission means to intercept
and retransmit the response signal, and for verifying that the user’s signature is authentic.
Claim 12 is representative of the claimed invention and is reproduced as follows:
12. A system for controlling locking/unlocking means of at least one openable panel
of a vehicle, comprising:
vehicle transmission/reception means (3, 4, 5) carried by the vehicle, comprising
vehicle memory means (7) comprising a vehicle circular shift register in which is stored a
pseudo-random code;
vehicle transmission means (3, 6, 7) for transmitting an interrogation signal which carries
the pseudo-random code; and
This was communicated to Appellant’s representative by telephone on November 14, 2006.
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