Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4747642 | Control of subsidence during underground gasification of coal | Thomas S. Buxton | 1988-05-31 |
| 4662443 | Combination air-blown and oxygen-blown underground coal gasification process | Rajen Puri, Luis E. Arri | 1987-05-05 |
| 4648450 | Method of producing synthesis gas by underground gasification of coal using specific well configuration | Luis E. Arri, Elton B. Hunt, Jr., David R. Parrish | 1987-03-10 |
| 4637465 | Removal of phenols in groundwater after underground gasification of coal | — | 1987-01-20 |