Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8393403 | Drill string flow control valves and methods | — | 2013-03-12 |
| 8066079 | Drill string flow control valves and methods | — | 2011-11-29 |
| 6843331 | Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications | — | 2005-01-18 |
| 6536540 | Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications | — | 2003-03-25 |