Issued Patents All Time
Showing 51–75 of 78 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5582258 | Earth boring drill bit with chip breaker | Wayne R. Hansen | 1996-12-10 |
| 5560440 | Bit for subterranean drilling fabricated from separately-formed major components | — | 1996-10-01 |
| 5533582 | Drill bit cutting element | — | 1996-07-09 |
| 5503236 | Swivel/tilting bit crown for earth-boring drills | — | 1996-04-02 |
| 5460233 | Diamond cutting structure for drilling hard subterranean formations | Nigel Charles Meany, Craig H. Cooley | 1995-10-24 |
| 5441121 | Earth boring drill bit with shell supporting an external drilling surface | — | 1995-08-15 |
| 5435403 | Cutting elements with enhanced stiffness and arrangements thereof on earth boring drill bits | — | 1995-07-25 |
| 5431239 | Stud design for drill bit cutting element | Craig H. Cooley, Redd H. Smith, Paul E. Pastusek, Ralph M. Horton | 1995-07-11 |
| 5377773 | Drill bit having combined positive and negative or neutral rake cutters | — | 1995-01-03 |
| 5361859 | Expandable gage bit for drilling and method of drilling | — | 1994-11-08 |
| 5355750 | Rolling cone bit with improved wear resistant inserts | Danny E. Scott, Redd H. Smith | 1994-10-18 |
| 5348108 | Rolling cone bit with improved wear resistant inserts | Danny E. Scott, Redd H. Smith | 1994-09-20 |
| 5337844 | Drill bit having diamond film cutting elements | — | 1994-08-16 |
| 5316095 | Drill bit cutting element with cooling channels | — | 1994-05-31 |
| 5314033 | Drill bit having combined positive and negative or neutral rake cutters | — | 1994-05-24 |
| 5285859 | Drill bit cutter mounting system providing selectable orientation of the cutting element | — | 1994-02-15 |
| 5284215 | Earth-boring drill bit with enlarged junk slots | — | 1994-02-08 |
| 5279375 | Multidirectional drill bit cutter | William R. Trujillo | 1994-01-18 |
| 5238074 | Mosaic diamond drag bit cutter having a nonuniform wear pattern | Kenneth Johns | 1993-08-24 |
| 5199511 | Drill bit and method for reducing formation fluid invasion and for improved drilling in plastic formations | Craig H. Cooley | 1993-04-06 |
| 5172778 | Drill bit cutter and method for reducing pressure loading of cutters | Paul E. Pastusek | 1992-12-22 |
| 5090491 | Earth boring drill bit with matrix displacing material | Ralph M. Horton, Lorenzo G. Lovato | 1992-02-25 |
| 5004057 | Drill bit with improved steerability | Mark L. Jones | 1991-04-02 |
| 4981183 | Apparatus for taking core samples | — | 1991-01-01 |
| 4976324 | Drill bit having diamond film cutting surface | — | 1990-12-11 |