Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876511 | Method and apparatus for testing and calibrating an electromagnetic logging tool | — | 1989-10-24 |
| 4857852 | Induction well logging apparatus with transformer coupled phase sensitive detector | Robert L. Kleinberg, Weng C. Chew, David Mariani | 1989-08-15 |
| 4845433 | Apparatus for microinductive investigation of earth formations | Robert L. Kleinberg, Donald G. Dudley, Weng C. Chew | 1989-07-04 |
| RE32913 | Shields for antennas of borehole logging devices | — | 1989-04-25 |