Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6390210 | Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty | Gary R. Portwood, James C. Minikus, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 2002-05-21 |
| 6367568 | Steel tooth cutter element with expanded crest | Stephen C. Steinke, Gary R. Portwood, David P. Moran, Quan Nguyen | 2002-04-09 |