Issued Patents All Time
Showing 51–75 of 108 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7819208 | Dynamically stable hybrid drill bit | Don Q. Nguyen, Michael S. Damschen, Michael L. Doster | 2010-10-26 |
| 7673709 | Earth-boring bit with shear cutting elements | Floyd C. Felderhoff | 2010-03-09 |
| 7647991 | Cutting structure for earth-boring bit to reduce tracking | Floyd C. Felderhoff, Matthew R. Isbell | 2010-01-19 |
| 7628230 | Wide groove roller cone bit | James L. Overstreet, Robert J. Buske, Don Q. Nguyen | 2009-12-08 |
| 7600590 | Low projection inserts for rock bits | Floyd C. Felderhoff, Brian Baker, Jimmy W. Eason | 2009-10-13 |
| 7350600 | Shirttails for reducing damaging effects of cuttings | Christopher C. Beuershausen, Raul E. Lema, Ronald Hales, Don Q. Nguyen, Gregory L. Ricks +6 more | 2008-04-01 |
| 7343990 | Rotary rock bit with hardfacing to reduce cone erosion | James L. Overstreet, Russell S. Nibogie, Robert J. Buske | 2008-03-18 |
| 7240746 | Bit gage hardfacing | James L. Overstreet, Robert J. Buske, Jeremy K. Morgan | 2007-07-10 |
| 7182162 | Shirttails for reducing damaging effects of cuttings | Christopher C. Beuershausen, Raul E. Lema, Ronald Hales, Don Q. Nguyen, Gregory L. Ricks +6 more | 2007-02-27 |
| 7000715 | Rotary drill bits exhibiting cutting element placement for optimizing bit torque and cutter life | Lawrence Allen Sinor, Christopher C. Beuershausen, Mark W. Dykstra, Roger Fincher, Roland Illerhaus | 2006-02-21 |
| 6923276 | Streamlined mill-toothed cone for earth boring bit | James L. Overstreet, Alan J. Massey, Jeremy K. Morgan | 2005-08-02 |
| 6601661 | Secondary cutting structure | Brian Baker, Brian Andrew Wiesner | 2003-08-05 |
| 6443246 | Long barrel inserts for earth-boring bit | Brian C. Wiesner, George E. Dolezal, Matthew R. Isbell, James Lawrence Jacobsen, Brian Baker | 2002-09-03 |
| 6443249 | Rotary drill bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics | Christopher C. Beuershausen, Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Steve R. Matson +2 more | 2002-09-03 |
| 6408958 | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped | Matthew R. Isbell, Michael L. Doster, Mark W. Dykstra, William Heuser | 2002-06-25 |
| 6401844 | Cutter with complex superabrasive geometry and drill bits so equipped | Michael L. Doster | 2002-06-11 |
| 6332503 | Fixed cutter bit with chisel or vertical cutting elements | Danny E. Scott, Matthias Meister, Ronny D. McCormick | 2001-12-25 |
| 6328117 | Drill bit having a fluid course with chip breaker | Sean K. Berzas, Ralf Duerholt, Danny E. Scott | 2001-12-11 |
| 6321862 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability | Christopher C. Beuershausen, Robert J. Costo, Jr., Danny E. Scott, Roland Illerhaus, Mark W. Dykstra +3 more | 2001-11-27 |
| 6290007 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability | Christopher C. Beuershausen, Robert J. Costo, Jr., Danny E. Scott | 2001-09-18 |
| 6230828 | Rotary drilling bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics | Christopher C. Beuershausen, Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Steve R. Matson +2 more | 2001-05-15 |
| 6209668 | Earth-boring bit with improved cutting structure | Don Q. Nguyen, Scott Ray Schmidt | 2001-04-03 |
| 6173797 | Rotary drill bits for directional drilling employing movable cutters and tandem gage pad arrangement with active cutting elements and having up-drill capability | Mark W. Dykstra, James A. Norris, Christopher C. Beuershausen | 2001-01-16 |
| 6142247 | Biased nozzle arrangement for rolling cone rock bits | — | 2000-11-07 |
| 6116356 | Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter | Michael L. Doster, David M. Schnell, Bart T. McDonald | 2000-09-12 |