Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889183 | Method and apparatus for retaining shaped charges | Kenneth C. Sommers, David S. Wesson | 1989-12-26 |
| 4862964 | Method and apparatus for perforating well bores using differential pressure | Flint R. George | 1989-09-05 |
| 4836109 | Control line differential firing head | David S. Wesson | 1989-06-06 |
| 4800958 | Annulus pressure operated vent assembly | David M. Haugen, David S. Wesson, Robert R. Luke | 1989-01-31 |