Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7222006 | Method for determination of pre-authorization engine operation time for a vehicle theft deterrent system | David T. Proefke, Thomas M. Forest | 2007-05-22 |
| 6653747 | Electronic key system including ignition and transmission control | David T. Proefke, Thomas E. Utter, Robert Baillargeon, Jeffrey R. Coil, Andrew C. Brenz +4 more | 2003-11-25 |
| 6386447 | Smart card with card in vehicle warning | David T. Proefke, Thomas E. Utter, Robert Baillargeon, Jeffrey R. Coil, Andrew C. Brenz +4 more | 2002-05-14 |