Issued Patents All Time
Showing 26–50 of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6484826 | Engineered enhanced inserts for rock drilling bits | Nathan R. Anderson, J. Daniel Belnap, Chris E. Cawthorne, Ronald K. Eyre, Madapusi K. Keshavan +2 more | 2002-11-26 |
| 6460636 | Drill bit inserts with variations in thickness of diamond coating | Zhou Yong, Suprant J. Huang, Nathan R. Anderson, J. Daniel Belnap, Chris E. Cawthorne +4 more | 2002-10-08 |
| 6431293 | Dual-seal drill bit pressure communication system | Chris E. Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2002-08-13 |
| 6422327 | Drill bit with ridge-cutting cutter elements | J. Albert Sue | 2002-07-23 |
| 6390210 | Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty | Gary E. Garcia, 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 E. Garcia, David P. Moran, Quan Nguyen | 2002-04-09 |
| 6305483 | Multi-piece rotary cone drill bit seal | — | 2001-10-23 |
| 6290008 | Inserts for earth-boring bits | Michael A. Siracki | 2001-09-18 |
| 6241035 | Superhard material enhanced inserts for earth-boring bits | — | 2001-06-05 |
| 6241034 | Cutter element with expanded crest geometry | Stephen C. Steinke, Gary E. Garcia, David P. Moran | 2001-06-05 |
| 6199645 | Engineered enhanced inserts for rock drilling bits | Nathan R. Anderson, J. Daniel Belnap, Chris E. Cawthorne, Ronald K. Eyre, Madapusi K. Keshavan +2 more | 2001-03-13 |
| 6196339 | Dual-seal drill bit pressure communication system | Chris E. Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2001-03-06 |
| 6176329 | Drill bit with ridge-cutting cutter elements | J. Albert Sue | 2001-01-23 |
| 6161634 | Cutter element with non-rectilinear crest | James C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary E. Garcia, David P. Moran | 2000-12-19 |
| 6059054 | Non-symmetrical stress-resistant rotary drill bit cutter element | Gary E. Garcia, James C. Minikus, Per Ivar Nese, Chris E. Cawthorne, Scott D. McDonough | 2000-05-09 |
| 6033117 | Sealed bearing drill bit with dual-seal configuration | Peter Thomas Cariveau, Robert H. Slaughter, Jr., Roger Didericksen, Chris E. Cawthorne | 2000-03-07 |
| RE36452 | Composite seal for rotary cone rock bits | Robert G. Upton, Michael Hooper, Jerry Pyka, Robert X. Chambers, Randy Johnston | 1999-12-21 |
| 5967245 | Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty | Gary E. Garcia, James C. Minikus, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne +1 more | 1999-10-19 |
| 5947216 | Cutter assembly for rock bits with back support groove | David Truax, Ghanshyam Rai, Stephen G. Southland | 1999-09-07 |
| 5915486 | Cutter element adapted to withstand tensile stress | Scott D. McDonough, Dennis Cisneros | 1999-06-29 |
| 5853055 | Rock bit with an extended center jet | Michael A. Siracki, Per Ivar Nese, Alan W. Lockstedt, Dennis Cisneros, Michael S. Oliver | 1998-12-29 |
| 5833020 | Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty | Gary E. Garcia, James C. Minikus, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 1998-11-10 |
| 5813485 | Cutter element adapted to withstand tensile stress | — | 1998-09-29 |
| 5421424 | Bowed out chisel insert for rock bits | James C. Minikus, Scott D. McDonough, Michael A. Siracki | 1995-06-06 |
| 5415244 | Conical inserts for rolling cone rock bits | — | 1995-05-16 |