Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690820 | Wellhead brine treatment | Thomas M. Ellis | 1997-11-25 |
| 5669734 | Process for making underground storage caverns | Frank V. Whelply, William H. Barlow | 1997-09-23 |
| 5637228 | Wellhead brine treatment | Thomas M. Ellis | 1997-06-10 |