Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876672 | Ultrasonic logging tool with rotating exposed transducer | Thomas Schasteen | 1989-10-24 |
| 4835876 | Instrument chassis and body supports for pipeline survey pig | Michel Cabiran, John David Cooper | 1989-06-06 |
| 4830105 | Centralizer for wellbore apparatus | — | 1989-05-16 |
| 4819760 | Locking arm for well tool | — | 1989-04-11 |