Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7691173 | Consolidated hard materials, earth-boring rotary drill bits including such hard materials, and methods of forming such hard materials | James C. Westhoff, Roy C. Lueth | 2010-04-06 |
| 7600590 | Low projection inserts for rock bits | Floyd C. Felderhoff, Brian Baker, Rudolf Carl Pessier | 2009-10-13 |
| 7556668 | Consolidated hard materials, methods of manufacture, and applications | James C. Westhoff, Roy C. Lueth | 2009-07-07 |
| 7510034 | System, method, and apparatus for enhancing the durability of earth-boring bits with carbide materials | David A. Curry, James L. Overstreet | 2009-03-31 |
| 7152703 | Compact for earth boring bit with asymmetrical flanks and shoulders | Matthew J. Meiners, Raul E. Lema | 2006-12-26 |
| 7011169 | Expanded coverage carbide compact | — | 2006-03-14 |
| 6372012 | Superhard filler hardmetal including a method of making | Shivanand I. Majagi, Robert W. Britzke | 2002-04-16 |
| 5780139 | Multi-layer anvil for ultra high pressure presses | Lan Carter, Madapusi K. Keshavan, Ghanshyam Rai, Vonnie D. Hood | 1998-07-14 |
| 5628837 | Surface decarburization of a drill bit having a refined primary cutting edge | Robert W. Britzke, Zhigang Fang | 1997-05-13 |
| 5609447 | Surface decarburization of a drill bit | Robert W. Britzke, Zhigang Fang | 1997-03-11 |