Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11995653 | Age verification card and method | — | 2024-05-28 |
| 8151975 | Rail conveyor system | — | 2012-04-10 |
| D353301 | Oven tray | — | 1994-12-13 |
| 5211376 | Motorcycle jack | — | 1993-05-18 |
| 5131471 | Single well injection and production system | John H. Duerksen, Doug J. McCallum, Mark Petrick | 1992-07-21 |
| 5024275 | Method of recovering hydrocarbons using single well injection/production system | John H. Duerksen, Doug J. McCallum, Mark Petrick | 1991-06-18 |
| 4480695 | Method of assisting surface lift of heated subsurface viscous petroleum | — | 1984-11-06 |
| 4368781 | Method of recovering viscous petroleum employing heated subsurface perforated casing containing a movable diverter | — | 1983-01-18 |