Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884439 | Hydraulic circuit use in wireline formation tester | — | 1989-12-05 |
| 4843878 | Method and apparatus for instantaneously indicating permeability and horner plot slope relating to formation testing | Ernest H. Purfurst | 1989-07-04 |
| 4808925 | Three magnet casing collar locator | — | 1989-02-28 |