Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6820704 | Rock bit seal with extrusion prevention member | Nephi M. Mourik | 2004-11-23 |
| 6782959 | Cutter element with non-linear, expanded crest | James C. Minikus, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran +1 more | 2004-08-31 |
| 6695079 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2004-02-24 |
| 6679342 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert Denton, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau | 2004-01-20 |