Issued Patents All Time
Showing 51–61 of 61 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7469757 | Drill bit with diamond impregnated cutter element | Timothy P. Beaton | 2008-12-30 |
| 7461709 | Multiple diameter cutting elements and bits incorporating the same | Madapusi K. Keshavan, David Truax | 2008-12-09 |
| 7426969 | Bits and cutting structures | — | 2008-09-23 |
| 7234550 | Bits and cutting structures | Jonathan Thiele, Tommy G. Ray, Gary Chunn | 2007-06-26 |
| 6698538 | Drill bit having adjustable total flow area | Steffen S. Kristiansen, John (Youhe) Zhang | 2004-03-02 |
| 5655614 | Self-centering polycrystalline diamond cutting rock bit | — | 1997-08-12 |
| H1566 | Matrix diamond drag bit with PCD cylindrical cutters | — | 1996-08-06 |
| 5505273 | Compound diamond cutter | Simon Willis | 1996-04-09 |
| 5383527 | Asymmetrical PDC cutter | — | 1995-01-24 |
| 5363932 | PDC drag bit with improved hydraulics | — | 1994-11-15 |
| 4981184 | Diamond drag bit for soft formations | R. Helene Knowlton | 1991-01-01 |