Communications: electrical – Selective – Intelligence comparison for controlling
Reexamination Certificate
2005-08-17
2010-02-23
Holloway, III, Edwin C (Department: 2612)
Communications: electrical
Selective
Intelligence comparison for controlling
C340S005720, C340S870030
Reexamination Certificate
active
07667571
ABSTRACT:
A locking system for providing authorization to access and drive a motor vehicle has a first control device for unlocking and locking the car doors, the ignition lock, the steering wheel lock, etc. Additionally, the locking system has a second device, which is an electronic key or an identifier. The two devices have transmission means and/or receiving means for electromagnetic signals with frequencies ν lying in a frequency band between two cut-off frequencies νa, νb. At least one of the signals, transmitted between the devices, is a coded operating signal for authenticating the second device. The actual frequency νi with which the transmission means of the second device is operated is stored in a storage means of the first device.
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Geber Michael
Hipp Uwe
Mattes Johannes
Mueller Karl
Pohlmann Andreas
Burr & Brown
Holloway, III Edwin C
Marquardt GmbH
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