Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853616 | Detection of water saturation in insulation at cased road crossings | — | 1989-08-01 |
| 4837518 | Method and apparatus for measuring the electrical resistivity of geologic formations through metal drill pipe or casing | John E. E. Kingman, James D. Klein | 1989-06-06 |