Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844161 | Locking orientation sub and alignment housing for drill pipe conveyed logging system | E. Edward Rankin, Donald E. Hensley | 1989-07-04 |
| 4842059 | Flex joint incorporating enclosed conductors | — | 1989-06-27 |
| 4799546 | Drill pipe conveyed logging system | Donald E. Hensley, E. Edward Rankin, David M. Moody | 1989-01-24 |