Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10648049 | Heat treated heavy weight drill pipe | Wenhui Jiang, Fengxiao Liu, Doyle Brinegar | 2020-05-12 |
| 9816328 | Friction welded heavy weight drill pipes | Wenhui Jiang | 2017-11-14 |
| 8617289 | Hardfacing compositions for earth boring tools | Gregory T. Lockwood | 2013-12-31 |
| 8596345 | RCD sealing elements with multiple elastomer materials | Yanmei Li, Sudarsanam Chellappa | 2013-12-03 |
| 8342268 | Tough carbide bodies using encapsulated carbides | Gregory T. Lockwood | 2013-01-01 |
| 8235149 | Diamond bit steel body cutter pocket protection | Thomas W. Oldham | 2012-08-07 |
| 8211203 | Matrix powder for matrix body fixed cutter bits | Xiayang Sheng, Gregory T. Lockwood | 2012-07-03 |
| 7743857 | Cutting elements of gage row and first inner row of a drill bit | Gary R. Portwood, Scott D. McDonough | 2010-06-29 |
| 7644786 | Diamond bit steel body cutter pocket protection | Thomas W. Oldham | 2010-01-12 |
| 7387178 | Self relieving seal | James L. Neville, James L. Larsen, Steven W. Peterson, Manikiran Bandi, Peter Thomas Cariveau +3 more | 2008-06-17 |
| 7367413 | Cutting elements of gage row and first inner row of a drill bit | Gary R. Portwood, Scott D. McDonough | 2008-05-06 |
| 7267183 | Drill bit lubricant with enhanced load carrying/anti wear properties | Robert Denton, Alysia C. White | 2007-09-11 |
| 7201241 | Self relieving seal | James L. Neville, James L. Larsen, Steven W. Peterson, Manikiran Bandi, Peter Thomas Cariveau +3 more | 2007-04-10 |
| 7124842 | Cutting elements of gage row and first inner row of a drill bit | Gary R. Portwood, Scott D. McDonough | 2006-10-24 |
| 7121365 | Rock bit with grease composition utilizing polarized graphite | Robert Denton | 2006-10-17 |
| 6988569 | Cutting element orientation or geometry for improved drill bits | Gary R. Portwood, Scott D. McDonough | 2006-01-24 |
| 6976548 | Self relieving seal | James L. Neville, James L. Larsen, Steven W. Peterson, Manikiran Bandi, Peter Thomas Cariveau +3 more | 2005-12-20 |
| 6848521 | Cutting elements of gage row and first inner row of a drill bit | Gary R. Portwood, Scott D. McDonough | 2005-02-01 |
| 6640913 | Drill bit with canted gage insert | Gary R. Portwood, Scott D. McDonough | 2003-11-04 |
| 5853055 | Rock bit with an extended center jet | Michael A. Siracki, Per Ivar Nese, Dennis Cisneros, Michael S. Oliver, Gary R. Portwood | 1998-12-29 |
| 5131480 | Rotary cone milled tooth bit with heel row cutter inserts | Quan Nguyen | 1992-07-21 |
| 4499642 | Composite bearing | Edward Vezirian, Richard J. Quinones | 1985-02-19 |
| 4486104 | Composite bearing | Edward Vezirian, Richard J. Ouinones | 1984-12-04 |