Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5432413 | Control system for an electrically propelled traction vehicle | Frederick Beach, Francis M. Grabowski, Wing Yeung Chung | 1995-07-11 |
| 5373219 | Control system for an electrically propelled traction vehicle | Francis M. Grabowski, Frederick Beach, James W. Nash, Paul H. Curtis | 1994-12-13 |
| 5280223 | Control system for an electrically propelled traction vehicle | Francis M. Grabowski, Frederick Beach, James W. Nash, Paul H. Curtis | 1994-01-18 |