Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5992544 | Fire suppression apparatus for well drilling system | — | 1999-11-30 |
| 5975219 | Method for controlling entry of a drillstem into a wellbore to minimize surge pressure | — | 1999-11-02 |
| 5890549 | Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus | — | 1999-04-06 |