| 12421801 |
Drill bit for use with intensified fluid pressures |
Gary R. Portwood, Alessandro Bertini, Simone Pallesi, Johann Obermair, James L. Larsen +1 more |
2025-09-23 |
| 12037850 |
Drill bit for use with intensified fluid pressures |
Gary R. Portwood, Alessandro Bertini, Simone Pallesi, Johann Obermair, James L. Larsen +1 more |
2024-07-16 |
| 11512536 |
Drill bit for use with intensified fluid pressures |
Gary R. Portwood, Alessandro Bertini, Simone Pallesi, Johann Obermair, James L. Larsen +1 more |
2022-11-29 |
| 9856701 |
Rolling cone drill bit having high density cutting elements |
Gary R. Portwood, Giampaolo Ferrari, Joshua Gatell, John Clunan, Allen D. White |
2018-01-02 |
| 9074431 |
Rolling cone drill bit having high density cutting elements |
Gary R. Portwood, Giampaolo Ferrari, Josh Gatell, John Clunan, Allen D. White |
2015-07-07 |
| 8281881 |
Rolling cone drill bit having cutting elements with improved orientations |
— |
2012-10-09 |
| 8091654 |
Rock bit with vectored hydraulic nozzle retention sleeves |
James L. Larsen, Gary R. Portwood, Riccardo Gronchi |
2012-01-10 |
| 7913778 |
Rock bit with hydraulic configuration |
James L. Larsen, Gary R. Portwood, Riccardo Gronchi |
2011-03-29 |
| 7690442 |
Drill bit and cutting inserts for hard/abrasive formations |
Gary R. Portwood, Peter Wilson, Bryce Baker, Daniel W. Brietzke |
2010-04-06 |
