Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4905759 | Collapsible gun assembly | David S. Wesson, David M. Haugen | 1990-03-06 |
| 4901802 | Method and apparatus for perforating formations in response to tubing pressure | Flint R. George | 1990-02-20 |
| 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 |
| 4762179 | Pressure assist detonating bar and method for a tubing conveyed perforator | David S. Wesson, Robert R. Luke, Flint R. George, David M. Haugen | 1988-08-09 |
| 4760884 | Air chamber actuated dual tubing release assembly | David M. Haugen, Flint R. George | 1988-08-02 |
| 4732211 | Annulus pressure operated vent assembly | David M. Haugen, David S. Wesson, Robert R. Luke | 1988-03-22 |
| 4658902 | Surging fluids downhole in an earth borehole | David S. Wesson, A. Glen Edwards, Flint R. George, Emmert F. Brieger | 1987-04-21 |