Appeal No. 2002-1281
Application No. 08/857,711
required for the anti-theft system to allow the vehicle to start.
In order to overcome this problem, prior techniques required
disengaging the passive anti-theft security system or removal of
the transponder from the key and placement of that transponder
inside or near first and second coils at the ignition switch.
Since these prior techniques incapacitated the passive anti-
theft security system, thus removing the protection afforded by
the security system, the instant invention is said to overcome
the shortcomings of the prior art by employing a second
transponder and an extra coil, wherein the second transponder is
positioned about the ignition switch in order to receive the
signal transmitted by the first coil. Further, the extra coil is
wound around the shell of the second transponder. The extra coil
is normally shorted/closed via a relay so transmitted energy from
the first coil is blocked. The energy is blocked because the
second transponder is placed about the ignition switch and is
always in a position to receive the signal from the first coil
and to transmit its authorized code to a controller via the
second coil. If the second transponder is always operable, then
it will always receive the signal and it will always transmit at
the same time as the first transponder transmits. In this case,
the vehicle would be inoperable by the passive anti-theft
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