Issued Patents All Time
Showing 76–83 of 83 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6296067 | Protected lubricant reservoir for sealed bearing earth boring drill bit | Robert H. Slaughter, Jr., Kirk A. Norris, Roger Didericksen, William M. Conn | 2001-10-02 |
| 6254275 | Sealed bearing drill bit with dual-seal configuration and fluid-cleaning capability | Robert H. Slaughter, Jr., Roger Didericksen | 2001-07-03 |
| 6244364 | Earth-boring bit having cobalt/tungsten carbide inserts | Robert H. Slaughter, Jr., Zhigang Fang | 2001-06-12 |
| 6206110 | Protected lubricant reservoir with pressure control for sealed bearing earth boring drill bit | Robert H. Slaughter, Jr., Kirk A. Norris, Roger Didericksen, William M. Conn | 2001-03-27 |
| 6196339 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Robert Denton | 2001-03-06 |
| 6116357 | Rock drill bit with back-reaming protection | Robert B. Wagoner, Roger Didericksen, William M. Conn | 2000-09-12 |
| 6033117 | Sealed bearing drill bit with dual-seal configuration | Robert H. Slaughter, Jr., Roger Didericksen, Chris E. Cawthorne, Gary R. Portwood | 2000-03-07 |
| 5868502 | Thrust disc bearings for rotary cone air bits | Robert B. Wagoner | 1999-02-09 |