Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855870 | Assemblies for supporting electrical circuit boards within tubes | Donald L. Wesenberg, Peter A. Leaney | 1989-08-08 |
| 4845988 | Accelerometer having a permanent magnet with non-magnetic end members | Kenneth S. Evans | 1989-07-11 |
| 4802150 | Mud pressure control system with magnetic torque transfer | Anthony Russell | 1989-01-31 |