Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6695079 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Robert H. Slaughter, Jr., Peter Thomas Cariveau, Robert Denton | 2004-02-24 |
| 6679342 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Chris E. Cawthorne, Robert Denton, Robert H. Slaughter, Jr., Peter Thomas Cariveau | 2004-01-20 |