Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6814162 | One cone bit with interchangeable cutting structures, a box-end connection, and integral sensory devices | George Witman | 2004-11-09 |
| 6782959 | Cutter element with non-linear, expanded crest | James C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia +1 more | 2004-08-31 |
| 6698536 | Roller cone drill bit having lubrication contamination detector and lubrication positive pressure maintenance system | Gary R. Portwood | 2004-03-02 |