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Patent applications and USPTO patent grants for Knull; Craig.The latest application filed is for "fixed cutter drill bit with rotating cutter disc".
Patent | Date |
---|---|
Rotary drag bit Grant 9,038,752 - Knull , et al. May 26, 2 | 2015-05-26 |
Fixed cutter drill bit with rotating cutter disc Grant 8,881,848 - Knull , et al. November 11, 2 | 2014-11-11 |
Mud motor with integrated percussion tool and drill bit Grant 8,851,204 - Knull , et al. October 7, 2 | 2014-10-07 |
Fixed Cutter Drill Bit With Rotating Cutter Disc App 20130292185 - KNULL; CRAIG ;   et al. | 2013-11-07 |
Mud Motor With Integrated Percussion Tool And Drill Bit App 20130277116 - KNULL; CRAIG ;   et al. | 2013-10-24 |
Rotary Drag Bit App 20130075167 - Knull; Craig ;   et al. | 2013-03-28 |
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