Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882542 | Methods and apparatus for measurement of electronic properties of geological formations through borehole casing | — | 1989-11-21 |
| 4820989 | Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes | — | 1989-04-11 |
| 4804918 | Dual excitation acoustic paramagnetic logging tool | — | 1989-02-14 |