Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5685379 | Method of operating a steerable rotary drilling system | John D. Barr, William C. Motion | 1997-11-11 |
| 5671818 | Rotary drill bits | Alex Newton, Malcolm R. Taylor, Andrew Murdock | 1997-09-30 |