Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6782959 | Cutter element with non-linear, expanded crest | James C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, David P. Moran +1 more | 2004-08-31 |
| 6561293 | Cutter element with non-linear, expanded crest | James C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, David P. Moran +1 more | 2003-05-13 |
| 6510909 | 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 | 2003-01-28 |
| 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 |
| 6241034 | Cutter element with expanded crest geometry | Stephen C. Steinke, Gary R. Portwood, David P. Moran | 2001-06-05 |
| 6161634 | Cutter element with non-rectilinear crest | James C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, David P. Moran | 2000-12-19 |
| 6059054 | Non-symmetrical stress-resistant rotary drill bit cutter element | Gary R. Portwood, James C. Minikus, Per Ivar Nese, Chris E. Cawthorne, Scott D. McDonough | 2000-05-09 |
| 5967245 | Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty | Gary R. Portwood, James C. Minikus, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne +1 more | 1999-10-19 |
| 5833020 | Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty | Gary R. Portwood, James C. Minikus, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 1998-11-10 |