Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5337826 | Tester valve | — | 1994-08-16 |
| 5297629 | Drill stem testing with tubing conveyed perforation | Flint R. George | 1994-03-29 |
| 5228516 | Tester valve | — | 1993-07-20 |
| 5209303 | Compressible liquid mechanism for downhole tool | — | 1993-05-11 |
| 5138313 | Electrically insulative gap sub assembly for tubular goods | — | 1992-08-11 |
| 5133419 | Hydraulic shock absorber with nitrogen stabilizer | — | 1992-07-28 |
| 5083623 | Hydraulic shock absorber | — | 1992-01-28 |
| 4928520 | Plug release indicator | — | 1990-05-29 |
| 4801160 | High-pressure fluid flow connector | — | 1989-01-31 |
| 4673890 | Well bore measurement tool | George V. Copland | 1987-06-16 |
| 4669539 | Lock for downhole apparatus | — | 1987-06-02 |
| 4646829 | Hydraulically set and released bridge plug | Robert T. Evans, Bernard L. Hackney | 1987-03-03 |
| 4624317 | Well tool with improved valve support structure | — | 1986-11-25 |
| 4582140 | Well tool with selective bypass functions | — | 1986-04-15 |
| 4579174 | Well tool with hydraulic time delay | — | 1986-04-01 |
| 4522266 | Downhole tester valve with resilient seals | — | 1985-06-11 |
| 4448254 | Tester valve with silicone liquid spring | — | 1984-05-15 |
| 4444268 | Tester valve with silicone liquid spring | — | 1984-04-24 |
| 4378850 | Hydraulic fluid supply apparatus and method for a downhole tool | — | 1983-04-05 |
| 4375239 | Acoustic subsea test tree and method | George J. Nix | 1983-03-01 |
| 4374583 | Sleeve valve | — | 1983-02-22 |
| 4372392 | Full opening emergency relief and safety valve | Wilbur P. Clayton | 1983-02-08 |
| 4372391 | Screw operated emergency relief and safety valve | Wilbur P. Clayton, Gerald D. Jackson | 1983-02-08 |
| 4347900 | Hydraulic connector apparatus and method | — | 1982-09-07 |
| 4319633 | Drill pipe tester and safety valve | Michael E. McMahan, Gerald D. Jackson | 1982-03-16 |