Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6290231 | Diverter flow line seal | Donald R. Petrash | 2001-09-18 |
| 5890535 | Diverter flow line seal | Donald R. Petrash | 1999-04-06 |
| 5890541 | BOP isolation test tool | Charles E. Jennings | 1999-04-06 |
| 5199495 | Split wear bushing for a drilling rig | Norman Brammer, Herman O. Henderson, Jr. | 1993-04-06 |
| 4790572 | Tapered wedge packoff assembly for a casing hanger | — | 1988-12-13 |
| 4521040 | Combined metal and elastomer seal | John Pettit | 1985-06-04 |