Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4287953 | Method of removing conduit from curved borehole | — | 1981-09-08 |
| 4283089 | Pretreatment for fracturing coal seams | H. Douglas Dahl, Ronald W. Umphrey | 1981-08-11 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4287953 | Method of removing conduit from curved borehole | — | 1981-09-08 |
| 4283089 | Pretreatment for fracturing coal seams | H. Douglas Dahl, Ronald W. Umphrey | 1981-08-11 |