Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5259456 | Drill stem test tools | Jeffrey Charles Edwards, Robert D. Buchanan | 1993-11-09 |
| 5222559 | Valves | Jeffrey Charles Edwards, Robert D. Buchanan | 1993-06-29 |
| 5193619 | Well control apparatus | Jeffrey Charles Edwards, Robert D. Buchanan | 1993-03-16 |