Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5209642 | Modified optimum pitch propeller | Donald H. VanLiew | 1993-05-11 |
| 4932908 | Energy efficient asymmetric pre-swirl vane and twisted propeller propulsion system | Donald H. VanLiew | 1990-06-12 |