Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8172008 | Drilling apparatus with reduced exposure of cutters and methods of drilling | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +3 more | 2012-05-08 |
| 8066084 | Drilling apparatus with reduced exposure of cutters and methods of drilling | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +3 more | 2011-11-29 |
| 7814990 | Drilling apparatus with reduced exposure of cutters and methods of drilling | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +3 more | 2010-10-19 |
| 7350600 | Shirttails for reducing damaging effects of cuttings | Raul E. Lema, Ronald Hales, Don Q. Nguyen, Gregory L. Ricks, Chih Lin +6 more | 2008-04-01 |
| 7182162 | Shirttails for reducing damaging effects of cuttings | Raul E. Lema, Ronald Hales, Don Q. Nguyen, Gregory L. Ricks, Chih Lin +6 more | 2007-02-27 |
| 7096978 | Drill bits with reduced exposure of cutters | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +3 more | 2006-08-29 |
| 7000715 | Rotary drill bits exhibiting cutting element placement for optimizing bit torque and cutter life | Lawrence Allen Sinor, Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Rudolf Carl Pessier | 2006-02-21 |
| 6935441 | Drill bits with reduced exposure of cutters | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +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., Jack T. Oldham +3 more | 2004-08-24 |
| 6672406 | Multi-aggressiveness cuttting face on PDC cutters and method of drilling subterranean formations | — | 2004-01-06 |
| 6460631 | Drill bits with reduced exposure of cutters | Mark W. Dykstra, William Heuser, Michael L. Doster, Theodore E. Zaleski, Jr., Jack T. Oldham +3 more | 2002-10-08 |
| 6443249 | Rotary drill bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics | Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Steve R. Matson, James A. Norris +2 more | 2002-09-03 |
| 6349780 | Drill bit with selectively-aggressive gage pads | — | 2002-02-26 |
| 6321862 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability | Robert J. Costo, Jr., Danny E. Scott, Rudolf Carl Pessier, 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 | Robert J. Costo, Jr., Danny E. Scott, Rudolf Carl Pessier | 2001-09-18 |
| 6230828 | Rotary drilling bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics | Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Steve R. Matson, James A. Norris +2 more | 2001-05-15 |
| 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, Rudolf Carl Pessier | 2001-01-16 |
| 6138780 | Drag bit with steel shank and tandem gage pads | — | 2000-10-31 |
| 6112836 | Rotary drill bits employing tandem gage pad arrangement | John R. Spaar, James A. Norris, Rudolf Carl Pessier, Michael P. Ohanian, Roland Illerhaus +2 more | 2000-09-05 |
| 6006845 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability | Roland Illerhaus, Mark W. Dykstra, James A. Norris, Michael P. Ohanian, Rudolf Carl Pessier +1 more | 1999-12-28 |