Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4754811 | Controlled retracting gasifying agent injection point process for UCG sites | Pierre Ledent | 1988-07-05 |
| 4705109 | Controlled retracting gasifying agent injection point process for UCG sites | Pierre Ledent | 1987-11-10 |