Issued Patents All Time
Showing 25 most recent of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7416035 | Shaped inserts with increased retention force | Ramamurthy Viswanadham, Lance Richman, Anthony Griffo | 2008-08-26 |
| 7237627 | Bearing and lubrication system for earth boring bit | Lance Richman, Kirk A. Norris, Robert H. Slaughter, Jr. | 2007-07-03 |
| 6820704 | Rock bit seal with extrusion prevention member | Nephi M. Mourik | 2004-11-23 |
| 6782959 | Cutter element with non-linear, expanded crest | James C. Minikus, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran +1 more | 2004-08-31 |
| 6695079 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2004-02-24 |
| 6679342 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert Denton, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau | 2004-01-20 |
| 6615935 | Roller cone bits with wear and fracture resistant surface | Zhigang Fang, Anthony Griffo, Alysia C. White | 2003-09-09 |
| 6571887 | Directional flow nozzle retention body | Quan Nguyen, James L. Larsen, Michael A. Siracki | 2003-06-03 |
| 6561293 | Cutter element with non-linear, expanded crest | James C. Minikus, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran +1 more | 2003-05-13 |
| 6536542 | Rock bit seal with multiple dynamic seal surface elements | Zhigang Fang, Nephi M. Mourik, Sujian Huang | 2003-03-25 |
| 6516293 | Method for simulating drilling of roller cone bits and its application to roller cone bit design and performance | Sujian Huang | 2003-02-04 |
| 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, Per Ivar Nese, Dennis Cisneros | 2003-01-28 |
| 6484826 | Engineered enhanced inserts for rock drilling bits | Nathan R. Anderson, J. Daniel Belnap, Ronald K. Eyre, Madapusi K. Keshavan, Per Ivar Nese +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, Ronald K. Eyre +4 more | 2002-10-08 |
| 6460637 | Engineered enhanced inserts for rock drilling bits | Michael A. Siracki, Per Ivar Nese, Madapusi K. Keshavan, J. Daniel Belnap, Ronald K. Eyre +1 more | 2002-10-08 |
| 6439326 | Centered-leg roller cone drill bit | Sujian Huang | 2002-08-27 |
| 6431293 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2002-08-13 |
| 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, Per Ivar Nese, Dennis Cisneros | 2002-05-21 |
| 6361873 | Composite constructions having ordered microstructures | Zhou Yong, Sujian Huang, Michael A. Siracki, J. Albert Sue, Ghanshyam Rai +1 more | 2002-03-26 |
| 6336512 | Drill bit having canted seal | Michael A. Siracki, Steven W. Peterson, Quan Nguyen | 2002-01-08 |
| 6199645 | Engineered enhanced inserts for rock drilling bits | Nathan R. Anderson, J. Daniel Belnap, Ronald K. Eyre, Madapusi K. Keshavan, Per Ivar Nese +2 more | 2001-03-13 |
| 6196339 | Dual-seal drill bit pressure communication system | Gary R. Portwood, Robert H. Slaughter, Jr., Roger Didericksen, Peter Thomas Cariveau, Robert Denton | 2001-03-06 |
| 6179296 | Dual functioning seal for rock bits | Sujian Huang, Zhigang Fang, Michael A. Siracki | 2001-01-30 |
| 6170830 | Dual functioning seal for rock bits | Sujian Huang, Zhigang Fang, Michael A. Siracki | 2001-01-09 |
| 6161634 | Cutter element with non-rectilinear crest | James C. Minikus, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran | 2000-12-19 |