Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4493373 | Dynamic seal for well tools | — | 1985-01-15 |
| 4372391 | Screw operated emergency relief and safety valve | Burchus Q. Barrington, Wilbur P. Clayton | 1983-02-08 |
| 4319633 | Drill pipe tester and safety valve | Michael E. McMahan, Burchus Q. Barrington | 1982-03-16 |