Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848480 | Method and apparatus for wire line protection in a well | Michael J. Walsh, Merle E. Hanson | 1989-07-18 |
| 4845494 | Method and apparatus using casing and tubing for transmitting data up a well | Merle E. Hanson | 1989-07-04 |
| 4828051 | Method and apparatus for data transmission in a well using a flexible line with stiffener | Michael J. Walsh | 1989-05-09 |
| 4821035 | Method and apparatus using a well casing for transmitting data up a well | Merle E. Hanson | 1989-04-11 |