Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8627901 | Laser bottom hole assembly | Ryan J. Norton, Ryan P. McKay, David R. Mesnard, Jason D. Fraze, Mark S. Zediker +1 more | 2014-01-14 |
| 7950475 | Percussion drilling assembly having a floating feed tube | Shantanu N. Swadi, Jack Marshall, Charles H. Dewey, Kevin Edgar Harrington | 2011-05-31 |
| 7861802 | Flexible directional drilling apparatus and method | Charles H. Dewey | 2011-01-04 |
| 7735581 | Locking clutch for downhole motor | James Edmond Beylotte | 2010-06-15 |
| 7665548 | Secondary retainer for a downhole hammer bit | — | 2010-02-23 |
| 7597158 | Drilling and hole enlargement device | John E. Campbell, Charles H. Dewey, Ronald G. Schmidt | 2009-10-06 |
| 7513318 | Steerable underreamer/stabilizer assembly and method | Charles H. Dewey | 2009-04-07 |
| 7506703 | Drilling and hole enlargement device | John E. Campbell, Charles H. Dewey, Ronald G. Schmidt | 2009-03-24 |
| 7353845 | Inline bladder-type accumulator for downhole applications | Shantanu N. Swadi | 2008-04-08 |
| 7343989 | Secondary retainer for a downhole hammer bit | — | 2008-03-18 |
| 7267185 | Bit retainer system | Ronald G. Schmidt | 2007-09-11 |
| 6568076 | Method of making an internally profiled stator tube | Richard D. Bottos | 2003-05-27 |
| 6309195 | Internally profiled stator tube | Richard D. Bottos | 2001-10-30 |
| 5857531 | Bottom hole assembly for directional drilling | James W. Estep, Albert C. Odell, II | 1999-01-12 |
| 5332048 | Method and apparatus for automatic closed loop drilling system | Harold D. Johnson, Charles H. Dewey | 1994-07-26 |
| 5318138 | Adjustable stabilizer | Charles H. Dewey, Harold D. Johnson | 1994-06-07 |
| 5318137 | Method and apparatus for adjusting the position of stabilizer blades | Harold D. Johnson, Charles H. Dewey | 1994-06-07 |
| 5171139 | Moineau motor with conduits through the stator | Harold D. Johnson, Charles H. Dewey, Mark J. Hommel | 1992-12-15 |
| 4944774 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Naresh J. Kar, Thomas W. Oldham, Cary A. Roth, Brian J. Armstrong | 1990-07-31 |
| 4836307 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Naresh J. Kar, Thomas W. Oldham, Cary A. Roth, Brian J. Armstrong | 1989-06-06 |
| 4711311 | Vibration and erosion resistant nozzle | Michael S. Oliver | 1987-12-08 |
| 4501338 | Grease pump for sealed bearing rotary cone rock bits | — | 1985-02-26 |