Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837518 | Method and apparatus for measuring the electrical resistivity of geologic formations through metal drill pipe or casing | Michael F. Gard, John E. E. Kingman | 1989-06-06 |
| 4812766 | Telluric noise cancellation in induced polarization prospecting | — | 1989-03-14 |