Issued Patents All Time
Showing 101–122 of 122 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6353799 | Method and apparatus for determining potential interfacial severity for a formation | Nigel Charles Meany, David A. Curry, Leroy W. Ledgerwood, III | 2002-03-05 |
| 6298930 | Drill bits with controlled cutter loading and depth of cut | L. Allen Sinor, Wayne R. Hansen, Mark W. Dykstra, Gordon A. Tibbitts | 2001-10-09 |
| 6276465 | Method and apparatus for determining potential for drill bit performance | David A. Curry, Leroy W. Ledgerwood, III | 2001-08-21 |
| 6260636 | Rotary-type earth boring drill bit, modular bearing pads therefor and methods | Wayne R. Hansen, Brian E. Miller, Danny E. Scott, Daniel Beeman | 2001-07-17 |
| 6250408 | Earth-boring drill bits with enhanced formation cuttings removal features | William R. Trujillo | 2001-06-26 |
| 6230827 | Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling | William R. Trujillo | 2001-05-15 |
| 6125947 | Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling | William R. Trujillo | 2000-10-03 |
| 6079507 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Sean K. Berzas, Wayne R. Hansen | 2000-06-27 |
| 6009963 | Superabrasive cutting element with enhanced stiffness, thermal conductivity and cutting efficiency | Arthur A. Chaves, David M. Schnell, David Martin Johnson, Eoin M. O'Tighearnaigh, Luther Lawford White, III | 2000-01-04 |
| 6006846 | Cutting element, drill bit, system and method for drilling soft plastic formations | Gordon A. Tibbitts | 1999-12-28 |
| 5960896 | Rotary drill bits employing optimal cutter placement based on chamfer geometry | David H. Barr, Danny E. Scott | 1999-10-05 |
| 5901797 | Drilling apparatus with dynamic cuttings removal and cleaning | Wayne R. Hansen | 1999-05-11 |
| 5881830 | Superabrasive drill bit cutting element with buttress-supported planar chamfer | — | 1999-03-16 |
| 5836404 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Sean K. Berzas, Wayne R. Hansen | 1998-11-17 |
| 5794725 | Drill bits with enhanced hydraulic flow characteristics | William R. Trujillo, Sean K. Berzas, Wayne R. Hansen | 1998-08-18 |
| 5651420 | Drilling apparatus with dynamic cuttings removal and cleaning | Gordon A. Tibbitts | 1997-07-29 |
| 5590729 | Superhard cutting structures for earth boring with enhanced stiffness and heat transfer capabilities | Gordon A. Tibbitts, Wayne R. Hansen | 1997-01-07 |
| 5460233 | Diamond cutting structure for drilling hard subterranean formations | Nigel Charles Meany, Gordon A. Tibbitts | 1995-10-24 |
| 5437343 | Diamond cutters having modified cutting edge geometry and drill bit mounting arrangement therefor | Jeffrey B. Lund, Redd H. Smith | 1995-08-01 |
| 5431239 | Stud design for drill bit cutting element | Gordon A. Tibbitts, Redd H. Smith, Paul E. Pastusek, Ralph M. Horton | 1995-07-11 |
| 5199511 | Drill bit and method for reducing formation fluid invasion and for improved drilling in plastic formations | Gordon A. Tibbitts | 1993-04-06 |
| 4884477 | Rotary drill bit with abrasion and erosion resistant facing | Redd H. Smith | 1989-12-05 |