Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7699758 | Bi-directional exercise machine with different resistances in different directions | James R. Richards, Michael K. Durtschi | 2010-04-20 |
| D538863 | Exercise machine | John W. Griffin, James R. Richards, Michael K. Durtschi | 2007-03-20 |
| D531239 | Exercise machine | John W. Griffin, James R. Richards, Michael K. Durtschi | 2006-10-31 |
| D531238 | Exercise machine | John W. Griffin, James R. Richards, Michael K. Durtschi | 2006-10-31 |
| D528175 | Exercise machine | John W. Griffin, James R. Richards, Michael K. Durtschi | 2006-09-12 |
| 6792801 | Device for measuring force and angles | John W. Griffin, Earl Wagoner, Michael K. Durtschi | 2004-09-21 |
| D490732 | Device for measuring force and angles | John W. Griffin, Earl Van Wagoner, Michael K. Durtschi | 2004-06-01 |
| 4799671 | Weight lifting exercise apparatus | Earl Van Wagoner, Edward Balogh, Jr. | 1989-01-24 |