Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5368109 | Apparatus for arcuate drilling | Albert E. Roos, Jr., Roger C. Leaf, Steven W. Drews | 1994-11-29 |
| 5320179 | Steering sub for flexible drilling | Albert E. Roos, Jr., Roger C. Leaf | 1994-06-14 |