Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874072 | Viscous fan drive control with integrated speed sensor | Walter K. O'Neil | 1989-10-17 |
| 4850322 | Method and apparatus for positioning a torque motor armature | Loren H. Uthoff, Jr. | 1989-07-25 |
| 4846325 | Friction brake for variable speed viscous fan control | — | 1989-07-11 |
| 4828088 | Closed loop pulse modulated viscous fan control | Walter K. O'Neil | 1989-05-09 |