Method for preventing misuse of transponders left inside a vehic

Details Method for preventing misuse of transponders left inside a vehic Method for preventing misuse of transponders left inside a vehic

1998-08-13

1999-10-19

Hofsass, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340438, 34082531, 34082554, 34082569, 70257, 180287, B60R 2510

Patent

active

059695978

ABSTRACT:
A method for preventing misuse of a transponder left inside a vehicle, which is part of a keyless vehicle access system and coacts with a control system for access and driving authorization located in the vehicle. The control system emits, in response to a locking command, a check signal by way of which it is ascertained whether transponders are still located in the vehicle interior after locking. Transponders which are detected as being located in the vehicle interior after locking are recorded in a memory associated with the control system. Upon a subsequent legitimate access to the vehicle, transponders that are not again detected in the interior are inhibited.

REFERENCES:
patent: 4670746 (1987-06-01), Taniguchi et al.
patent: 4761645 (1988-08-01), Mochida
patent: 5552789 (1996-09-01), Schuermann
patent: 5561420 (1996-10-01), Kleefeldt et al.
patent: 5774060 (1998-06-01), Ostermann et al.

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