Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5211241 | Variable flow sliding sleeve valve and positioning shifting tool therefor | Christopher A. Dines, Robert C. Hammett, Clark E. Robison | 1993-05-18 |
| 5183114 | Sleeve valve device and shifting tool therefor | Robert C. Hammett | 1993-02-02 |
| 4944345 | Well device lock mandrel and running tool | — | 1990-07-31 |
| 4915175 | Well flow device | — | 1990-04-10 |
| 4448427 | Piston-expanded metallic seal for side door well valve | — | 1984-05-15 |