Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5396966 | Steering sub for flexible drilling | Steven W. Drews, William J. McDonald | 1995-03-14 |
| 5368109 | Apparatus for arcuate drilling | Frederick J. Pittard, Jr., Roger C. Leaf, Steven W. Drews | 1994-11-29 |
| 5320179 | Steering sub for flexible drilling | Roger C. Leaf, Frederick J. Pittard, Jr. | 1994-06-14 |