Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4672992 | Direct drive valve-ball drive mechanism | Robert D. Vanderlaan | 1987-06-16 |
| 4533891 | Limited angle torque motor | Robert D. Vanderlaan | 1985-08-06 |
| 4435133 | Free piston engine pump with energy rate smoothing | — | 1984-03-06 |