Issued Patents All Time
Showing 151–171 of 171 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5746280 | Earth-boring bit having shear-cutting inner row elements | Rudolf Carl Pessier, Turlach Paul Boylan | 1998-05-05 |
| 5663512 | Hardfacing composition for earth-boring bits | Kevin W. Schader, Ronald L. Jones, James L. Overstreet, Mou-Chih Lu, Alan J. Massey | 1997-09-02 |
| 5655612 | Earth-boring bit with shear cutting gage | Robert E. Grimes, Rudolf Carl Pessier | 1997-08-12 |
| 5592995 | Earth-boring bit having shear-cutting heel elements | Rudolf Carl Pessier, Matthew R. Isbell, Nigel Charles Meany, Alain Besson | 1997-01-14 |
| 5542485 | Earth-boring bit with improved cutting structure | Rudolf Carl Pessier, Robert E. Grimes, Matthew R. Isbell | 1996-08-06 |
| 5479997 | Earth-boring bit with improved cutting structure | Robert E. Grimes, Matthew R. Isbell, Rudolf Carl Pessier | 1996-01-02 |
| 5467836 | Fixed cutter bit with shear cutting gage | Robert E. Grimes, Rudolf Carl Pessier | 1995-11-21 |
| 5445231 | Earth-burning bit having an improved hard-faced tooth structure | Mou-Chih Lu, Rudolf Carl Pessier | 1995-08-29 |
| 5407022 | Free cutting gage insert with relief angle | Rudolf Carl Pessier | 1995-04-18 |
| 5355750 | Rolling cone bit with improved wear resistant inserts | Redd H. Smith, Gordon A. Tibbitts | 1994-10-18 |
| 5351768 | Earth-boring bit with improved cutting structure | Robert E. Grimes, Matthew R. Isbell, Rudolf Carl Pessier | 1994-10-04 |
| 5351769 | Earth-boring bit having an improved hard-faced tooth structure | Anton F. Zahradnik, Rudolf Carl Pessier | 1994-10-04 |
| 5348108 | Rolling cone bit with improved wear resistant inserts | Redd H. Smith, Gordon A. Tibbitts | 1994-09-20 |
| 5346026 | Rolling cone bit with shear cutting gage | Rudolf Carl Pessier | 1994-09-13 |
| 5287936 | Rolling cone bit with shear cutting gage | Robert E. Grimes | 1994-02-22 |
| 5259071 | Safety helmet and liner | Loy L. Earles | 1993-11-09 |
| 5248006 | Rotary rock bit with improved diamond-filled compacts | Stephen R. Jurewicz | 1993-09-28 |
| 5173090 | Rock bit compact and method of manufacture | Stephen R. Jurewicz | 1992-12-22 |
| 5119714 | Rotary rock bit with improved diamond filled compacts | Stephen R. Jurewicz | 1992-06-09 |
| 4726432 | Differentially hardfaced rock bit | Eric C. Sullivan | 1988-02-23 |
| 4643051 | Pack carburizing process for earth boring drill bits | Robert W. Simons, John Poland | 1987-02-17 |