Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431293 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2002-08-13 |
| 6408957 | Sealed bearing roller cone bit having anti-plugging device | Fakhroldin Mohammad Jadbabaei, Peter Thomas Cariveau, Vincent Shotton, Roger Didericksen | 2002-06-25 |