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Christian O. Johnson
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Rochester Hills, MI, US
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last 30 patents
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Patent Grant
Electronic key system including ignition and transmission control
Patent number
6,653,747
Issue date
Nov 25, 2003
Siemens VDO Automotive Corporation
David T. Proefke
B60 - VEHICLES IN GENERAL
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Patent Grant
Smart card with card in vehicle warning
Patent number
6,386,447
Issue date
May 14, 2002
Siemens Automotive Corporation
David T. Proefke
B60 - VEHICLES IN GENERAL