Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6003605 | Balanced line tubing retrievable safety valve | Rennie L. Dickson | 1999-12-21 |
| 5564502 | Well completion system with flapper control valve | Robert W. Crow, John C. Gano, James R. Longbottom, Karluf Hagen | 1996-10-15 |
| 5159981 | Flapper valve | — | 1992-11-03 |
| 4890674 | Flapper valve protection | — | 1990-01-02 |