| 7395882 |
Casing and liner drilling bits |
L. Allen Sinor, Eric E. McClain, Robert A. Laing, Evan C. Turner, Mark W. Dykstra +1 more |
2008-07-08 |
| 7178609 |
Window mill and drill bit |
Daniel R. Hart, Calvin J. Stowe, II, Trung Huynh, Roy Swanson, Rustom K. Mody +3 more |
2007-02-20 |
| 7096978 |
Drill bits with reduced exposure of cutters |
Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Terry D. Watts +3 more |
2006-08-29 |
| 6935441 |
Drill bits with reduced exposure of cutters |
Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Terry D. Watts +3 more |
2005-08-30 |
| 6779613 |
Drill bits with controlled exposure of cutters |
Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Terry D. Watts +3 more |
2004-08-24 |
| 6460631 |
Drill bits with reduced exposure of cutters |
Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Terry D. Watts +3 more |
2002-10-08 |
| 5979571 |
Combination milling tool and drill bit |
Danny E. Scott, Gerald D. Lynde, Greg Nazzal, Roy Swanson, Brad Randall +1 more |
1999-11-09 |
| 5957223 |
Bi-center drill bit with enhanced stabilizing features |
Michael L. Doster |
1999-09-28 |