Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5695015 | System and method of controlling rotation of a downhole instrument package | John D. Barr, Michael K. Russell | 1997-12-09 |
| 5685379 | Method of operating a steerable rotary drilling system | John D. Barr, John Martin Clegg | 1997-11-11 |