Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8201642 | Drilling assemblies including one of a counter rotating drill bit and a counter rotating reamer, methods of drilling, and methods of forming drilling assemblies | Steven R. Radford, Matthew J. Meiners | 2012-06-19 |
| 6397958 | Reaming apparatus and method with ability to drill out cement and float equipment in casing | Christopher S. Charles, William Gregory Presley, Douglas J. Bobrosky, Mark W. Dykstra, Mark E. Morris +2 more | 2002-06-04 |
| 6354387 | Nozzle orientation for roller cone rock bit | Thomas M. Harris, Leroy W. Ledgerwood, III, Brian C. Wiesner, Brian Baker | 2002-03-12 |
| 6328117 | Drill bit having a fluid course with chip breaker | Ralf Duerholt, Rudolf Carl Pessier, Danny E. Scott | 2001-12-11 |
| 6079507 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Craig H. Cooley, Wayne R. Hansen | 2000-06-27 |
| 5836404 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Craig H. Cooley, Wayne R. Hansen | 1998-11-17 |
| 5794725 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Craig H. Cooley, Wayne R. Hansen | 1998-08-18 |