Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6413297 | Method and apparatus for treating pressurized drilling fluid returns from a well | David Speed, Carel Willem Jan Hoyer | 2002-07-02 |
| 6315813 | Method of treating pressurized drilling fluid returns from a well | David Speed, Carel Willem Jan Hoyer | 2001-11-13 |