Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5746280 | Earth-boring bit having shear-cutting inner row elements | Danny E. Scott, Rudolf Carl Pessier | 1998-05-05 |
| 5295549 | Mechanical lock to prevent seal ring rotation | George E. Dolezal, Douglas J. Clinkscales, Anton F. Zahradnik | 1994-03-22 |