Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806928 | Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface | — | 1989-02-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806928 | Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface | — | 1989-02-21 |