Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5323859 | Streamlined flapper valve | Roddie R. Smith, Rennie L. Dickson | 1994-06-28 |
| 5318127 | Surface controlled annulus safety system for well bores | Rennie L. Dickson | 1994-06-07 |