Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348090 | Expanded slip well anchor | — | 1994-09-20 |
| 5323853 | Emergency downhole disconnect tool | Margarete C. Wong | 1994-06-28 |
| 5310004 | Fail safe gas bias safety valve | — | 1994-05-10 |
| 5167284 | Selective hydraulic lock-out well safety valve and method | — | 1992-12-01 |
| 5101897 | Slip mechanism for a well tool | Danny W. Wagoner | 1992-04-07 |
| 4976317 | Well tool hydrostatic release means | — | 1990-12-11 |
| 4838355 | Dual hydraulic safety valve | William A. Blizzard, Jr. | 1989-06-13 |