Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5850881 | Drill pipe float valve and method of manufacture | John E. Rodger | 1998-12-22 |
| 5727775 | Gate valve with dual seal rings on a unitary seat ring | John E. Rodger | 1998-03-17 |
| 5687792 | Drill pipe float valve and method of manufacture | John E. Rodger | 1997-11-18 |
| 5109926 | Wellbore packer with shearable anti-rotation locking member | Rustom K. Mody, Vel Berzin, James C. Burtner | 1992-05-05 |