Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4355686 | Well system and method | Thomas J. Heard | 1982-10-26 |
| 4344602 | Lock open mechanism for subsurface safety valve | — | 1982-08-17 |
| 4334581 | Balanced area safety valve | — | 1982-06-15 |