Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865364 | Conical thread form | — | 1989-09-12 |
| 4842061 | Casing hanger packoff with C-shaped metal seal | — | 1989-06-27 |
| 4842307 | Wellhead load supporting system | Thomas F. Sweeney, Charles E. Jennings | 1989-06-27 |