Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6729418 | Back reaming tool | Peter Thomas Cariveau, Vincent Shotton | 2004-05-04 |
| 6698098 | Cone erosion protection for roller cone drill bits | Anthony Griffo, Zhigang Fang | 2004-03-02 |
| 6695079 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2004-02-24 |
| 6679342 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Robert Denton, Roger Didericksen, Peter Thomas Cariveau | 2004-01-20 |