Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872526 | Sonic well logging tool longitudinal wave attenuator | Albert H. Wignall | 1989-10-10 |
| 4862991 | Sonic well logging tool transmitter | Albert H. Wignall, James J. Walulik | 1989-09-05 |
| 4850450 | Logging tool housing with acoustic delay | Shu-Kong Chang, Gyula Varga | 1989-07-25 |