Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862964 | Method and apparatus for perforating well bores using differential pressure | Kevin R. George | 1989-09-05 |
| 4804044 | Perforating gun firing tool and method of operation | David S. Wesson, Michael E. McMahan | 1989-02-14 |