| 7152701 |
Cutting element structure for roller cone bit |
Richard Butland, John James Herman, Ronald Birne-Browne, Louis Loiselle, J. Daniel Belnap |
2006-12-26 |
| 6510909 |
Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty |
Gary R. Portwood, Gary E. Garcia, James C. Minikus, Dennis Cisneros, Chris E. Cawthorne |
2003-01-28 |
| 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 |
| 6460637 |
Engineered enhanced inserts for rock drilling bits |
Michael A. Siracki, Chris E. Cawthorne, Madapusi K. Keshavan, J. Daniel Belnap, Ronald K. Eyre +1 more |
2002-10-08 |
| 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 |
| 6419034 |
Engineered enhanced inserts for rock drilling bits |
J. Daniel Belnap, Ronald K. Eyre, Michael A. Siracki, Madapusi K. Keshavan, Nathan R. Anderson |
2002-07-16 |
| 6390210 |
Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty |
Gary R. Portwood, Gary E. Garcia, James C. Minikus, Dennis Cisneros, Chris E. Cawthorne |
2002-05-21 |
| 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 |
| 6059054 |
Non-symmetrical stress-resistant rotary drill bit cutter element |
Gary R. Portwood, Gary E. Garcia, James C. Minikus, 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 E. Garcia, Gary R. Portwood, James C. Minikus, Dennis Cisneros, Chris E. Cawthorne +1 more |
1999-10-19 |
| 5853055 |
Rock bit with an extended center jet |
Michael A. Siracki, Alan W. Lockstedt, Dennis Cisneros, Michael S. Oliver, Gary R. Portwood |
1998-12-29 |
| 5833020 |
Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty |
Gary R. Portwood, Gary E. Garcia, James C. Minikus, Dennis Cisneros, Chris E. Cawthorne |
1998-11-10 |