Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7549467 | Wellbore motor having magnetic gear drive | William J. McDonald, Gareth Hatch | 2009-06-23 |
| 7487829 | Wellbore valve having linear magnetically geared valve actuator | William J. McDonald | 2009-02-10 |
| 7481283 | Wellbore motor having magnetic gear drive | William J. McDonald, Gareth Hatch | 2009-01-27 |
| 4918460 | Telescopic mast with a reel for winding sets of stays | Brian Collins, Reginald F. Batters, Mervyn Brameld | 1990-04-17 |