Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7281592 | Injecting a fluid into a borehole ahead of the bit | Douwe Johannes Runia, Robert Nicholas Worrall | 2007-10-16 |
| 7207398 | Steerable rotary drill bit assembly with pilot bit | Douwe Johannes Runia, Robert Nicholas Worrall | 2007-04-24 |