Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5147265 | Rotation-activated resistance device | Timothy S. Engel, Michael E. Heutmaker, Robert A. Iverson, Jeffrey E. Sandahl | 1992-09-15 |
| 5090694 | Combination chair and exercise unit | Timothy S. Engel, Michael E. Heutmaker, Robert A. Iverson, Jeffrey E. Sandahl | 1992-02-25 |
| 4728102 | Resistance indicator for frictionally resistant exercise device | — | 1988-03-01 |
| 4195532 | Ski stiffness and camber indicator | — | 1980-04-01 |