Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6446739 | Rock drill bit with neck protection | Lance Richman | 2002-09-10 |
| 6431293 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Robert Denton | 2002-08-13 |
| 6408957 | Sealed bearing roller cone bit having anti-plugging device | Robert H. Slaughter, Jr., Fakhroldin Mohammad Jadbabaei, Vincent Shotton, Roger Didericksen | 2002-06-25 |