Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5016768 | Pickup truck derrick with traveling sheaves | James C. Kennard, Carl J. Wick | 1991-05-21 |
| 4651884 | Portable and collapsible derrick structure | James C. Kennard | 1987-03-24 |
| 4615450 | Portable and collapsible derrick structure | James C. Kennard | 1986-10-07 |