Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6089332 | Steerable rotary drilling systems | John D. Barr, John Martin Clegg | 2000-07-18 |
| 5959380 | Prevention of particle accumulation between rotatable components of an electrical machine | Anthony W. Gillett | 1999-09-28 |
| 5803185 | Steerable rotary drilling systems and method of operating such systems | John D. Barr, John Martin Clegg | 1998-09-08 |
| 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 |