| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 10/26/1976 | US3987857 Side cutting device for earth boring procedures |
| 10/19/1976 | US3986570 Rock bit with quick change connection |
| 10/05/1976 | US3984158 Journal and pilot bearings with alternating surface areas of wear resistant and anti-galling materials |
| 09/28/1976 | US3982596 Drill bit |
| 09/28/1976 | US3982595 Rock boring cutter with replaceable cutting elements |
| 09/28/1976 | US3982594 Eccentric stabilizer |
| 09/21/1976 | US3981540 Rock breaking apparatus |
| 09/21/1976 | US3981371 Core sampling drill |
| 09/21/1976 | US3981370 Disc cutting unit for use on rock boring machines |
| 09/07/1976 | US3978933 Bit-adjacent stabilizer and steel |
| 09/07/1976 | US3978932 Apparatus and method for obtaining undisturbed soil core samples |
| 08/31/1976 | US3977481 Boring apparatus |
| 08/31/1976 | US3977479 Geological exploration method and apparatus |
| 08/17/1976 | US3974886 Directional drilling tool |
| 07/27/1976 | US3971600 Drill bit |
| 07/27/1976 | US3971450 Well drilling tool |
| 07/20/1976 | US3970335 Dual concentric pipes |
| 07/20/1976 | US3970158 Tooth loading for earth boring bits |
| 07/13/1976 | US3968847 Wellpoint jetting head |
| 07/06/1976 | US3967689 Reaming apparatus |
| 06/29/1976 | US3966274 Roller separator for bit bearings |
| 06/29/1976 | US3965996 Means and method of drilling wells |
| 06/29/1976 | US3965981 Pre-packed well points |
| 06/29/1976 | US3965685 Method for lowering ground water |
| 06/22/1976 | US3964554 Temperature-regulated, sealed bearing system for rock drill bits |
| 06/15/1976 | US3963282 Cantilevered roller separator for rock bit bearings |
| 06/15/1976 | US3962879 Reinforced pile in earth situs and method of producing same |
| 06/08/1976 | US3961824 Method and system for winning minerals |
| 06/01/1976 | US3960223 Drill for rock |
| 06/01/1976 | US3960222 Tool for cutting groove in hole |
| 05/25/1976 | US3958651 Vacuum, vacuum-pressure, or pressure circulation bit having jet-assisted vacuum |
| 05/25/1976 | US3958645 Bore hole air hammer |
| 05/18/1976 | US3957125 Multi-stage double-acting extendible and contractible shaft drive for drilling device |
| 05/11/1976 | US3955635 Percussion drill bit |
| 05/11/1976 | US3955633 Drill |
| 05/11/1976 | US3955632 Pipe laying apparatus |
| 05/11/1976 | US3955631 Soil sampler |
| 04/27/1976 | US3952819 Fatigue resistant anvil bit for percussion rock drill |
| 04/27/1976 | US3952818 Grooving bucket |
| 04/27/1976 | US3952816 Drilling system and method of pulling it up |
| 04/27/1976 | US3952815 Land erosion protection on a rock cutter |
| 04/20/1976 | US3951220 Archimedes spiral drill bit |
| 04/20/1976 | US3951219 Drill tool comprising a core barrel and a removable central portion |
| 04/13/1976 | US3950041 Rock bit bearing system for carrying out thrust |
| 04/13/1976 | US3949820 Underreamer cutter arm |
| 04/06/1976 | US3948588 Swivel for core drilling |
| 04/06/1976 | US3948330 Vacuum, vacuum-pressure, or pressure reverse circulation bit |
| 03/30/1976 | US3946820 Novel cutter elements for drill bits |
| 03/30/1976 | US3946817 Differentially carburized rock bit cutter |
| 03/23/1976 | US3945447 Boring apparatus |
| 03/23/1976 | US3945446 Stabilizer for drill strings |
| 03/23/1976 | US3945445 Boring apparatus provided with drill bits freely rotatable around their own axis |
| 03/23/1976 | US3945444 Split bit casing drill |
| 03/16/1976 | US3944306 Rock bit bearing seal |
| 03/16/1976 | US3944003 Bore hole air hammer |
| 03/09/1976 | US3942596 Lubricant pressure relief valve for earth penetrating tools |
| 03/02/1976 | US3941197 Rotary percussion earth boring bit |
| 03/02/1976 | US3941196 Percussive air hammer and core bit apparatus |
| 02/17/1976 | US3938599 Rotary drill bit |
| 02/17/1976 | US3938598 Belling apparatus |
| 02/17/1976 | US3938344 Earth auger and method for driving piles and the like by means of said earth auger |
| 02/03/1976 | US3935911 Earth boring bit with means for conducting heat from the bit's bearings |
| 01/27/1976 | US3934662 Core bit |
| 01/27/1976 | US3934660 Flexpower deep well drill |