Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5131471 | Single well injection and production system | John H. Duerksen, Donald J. Anderson, Mark Petrick | 1992-07-21 |
| 5024275 | Method of recovering hydrocarbons using single well injection/production system | Donald J. Anderson, John H. Duerksen, Mark Petrick | 1991-06-18 |