Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12256845 | Adjustable firmness mattress system | Philip J. Haarstad, Molly Haarstad, Alexander Haarstad, Benjamin Haarstad, Connie Marie Haarstad +10 more | 2025-03-25 |
| 6068460 | Two speed gerotor motor with pressurized recirculation | Karen J. Radford, Dwight B. Stephenson | 2000-05-30 |
| 5819532 | Dynamic load signal fluid controller with instant on flow amplification | Jinbo Wang | 1998-10-13 |
| 5638864 | Steering control unit with flow amplification for unequal area cylinder | Timothy A. Hjelsand, Bernard J. Larson | 1997-06-17 |
| RE34746 | Open-center steering control unit with flow amplification | Herman P. Schutten, Dwight B. Stephenson | 1994-10-04 |
| 4958493 | Open-center steering control unit with flow amplification | Herman P. Schutten, Dwight B. Stephenson | 1990-09-25 |
| 4862690 | Steering control unit with both flow amplification and manual steering capability | — | 1989-09-05 |
| 4781219 | Fluid controller and dampening fluid path | Douglas M. Gage | 1988-11-01 |
| 4759182 | Steering control unit with flow amplification | — | 1988-07-26 |