Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5784867 | Variable force traction enhance systems | Donald H. Parkes | 1998-07-28 |
| 5392871 | Amphibious vehicle and control | — | 1995-02-28 |
| 5279376 | Force neutralizing mechanism for a single lever control | Xinzhan Z. Yang, Steven D. Shivvers, Donald H. Parkes | 1994-01-18 |
| 4867716 | Boat | — | 1989-09-19 |
| 4773220 | Hydraulic transmission with coaxial power-take-off and motor shafts | — | 1988-09-27 |
| 4757740 | Multiple barrel gun | — | 1988-07-19 |
| 4557140 | Horsepower and fuel consumption gauge | — | 1985-12-10 |
| 4473763 | Solenoid motor | — | 1984-09-25 |
| 4278896 | Wind power generator | — | 1981-07-14 |
| 4237834 | Governor control device | — | 1980-12-09 |