Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7331899 | Hybrid vehicle powertrain with a multiple-ratio power transmission mechanism | Walt Ortmann, Dan Colvin, Michael Encelewski, Marvin Paul Kraska | 2008-02-19 |
| 7261671 | Hybrid vehicle powertrain with a multiple-ratio power transmission mechanism | Walt Ortmann, Dan Colvin, Michael Encelewski, Marvin Paul Kraska | 2007-08-28 |