| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 06/25/1987 | DE3545758A1 Drill for drilling out tap holes of blast furnaces |
| 06/24/1987 | EP0226537A2 Rock drill bit |
| 06/24/1987 | CN86200075U Hydraulic three-cylinder type core extractor |
| 06/23/1987 | US4674802 Multi-insert cutter bit |
| 06/16/1987 | US4673045 Enhanced circulation drill bit |
| 06/16/1987 | US4673044 Earth boring bit for soft to hard formations |
| 06/10/1987 | EP0225101A2 Improvements in or relating to drill bits |
| 06/10/1987 | EP0225082A2 Improvements in or relating to rotary drill bits |
| 06/09/1987 | US4671703 Apparatus for driving pipes through the ground |
| 06/09/1987 | US4671368 Earth boring bit with shear compression seal |
| 06/09/1987 | US4671367 Pole hole digger with percussive core drilling |
| 06/02/1987 | US4669556 Drill bit and cutter therefor |
| 06/02/1987 | US4669522 Manufacture of rotary drill bits |
| 06/02/1987 | CA1222448A1 Casing shoe |
| 05/26/1987 | US4668118 Tool |
| 05/26/1987 | US4667756 Matrix bit with extended blades |
| 05/26/1987 | US4667755 Air-cooled, dry drilling |
| 05/26/1987 | US4667754 Flexible plug for obtaining soil samples during drilling operations |
| 05/26/1987 | US4667742 Down hole excitation system for loosening drill pipe stuck in a well |
| 05/21/1987 | WO1987003036A1 Drill bit with full offset cutter bodies |
| 05/21/1987 | DE3540355A1 Drill for rotary percussive drilling |
| 05/19/1987 | US4666001 Earth boring bit with improved rigid face seal assembly |
| 05/19/1987 | US4666000 Rock bit cutter retainer |
| 05/19/1987 | US4665999 Variable length three-cone rock bit nozzles |
| 05/19/1987 | CA1221961A1 Rotary drill bit |
| 05/19/1987 | CA1221820A1 Rotatable cutting bit |
| 05/14/1987 | DE3539717A1 Roller bit |
| 05/12/1987 | CA1221681A1 Rock drill bit |
| 05/06/1987 | EP0220401A2 Underreamer |
| 05/06/1987 | CN85108125A Petrol drill head of low temperature electroplating composite flat type |
| 05/05/1987 | US4662459 Drilling system and method employing torsional sonic vibration for lubrication of journal type bit bearings |
| 04/30/1987 | DE3538237A1 Trepanning bit |
| 04/30/1987 | DE3538191A1 Rock drill |
| 04/29/1987 | EP0219992A2 Improvements in or relating to rotary drill bits |
| 04/29/1987 | EP0219959A2 Rock bit with wear resistant inserts |
| 04/28/1987 | US4660773 Leakproof high pressure nozzle assembly |
| 04/28/1987 | US4660660 Round/flat carbide seat |
| 04/28/1987 | US4660659 Drag type drill bit |
| 04/28/1987 | US4660657 Underreamer |
| 04/28/1987 | US4660444 Hardening of selected areas of an earth boring rockbit |
| 04/28/1987 | CA1221087A1 Drag bit and cutters |
| 04/23/1987 | DE3537379A1 Tunnel boring machine |
| 04/21/1987 | US4658918 Threaded nozzle for a drill bit |
| 04/15/1987 | EP0218567A2 Drill bit and roller cutter for said drill bit |
| 04/15/1987 | EP0217995A2 A device that may be applied to perforating drills for the drilling of foundation holes,and the insertion and stabilization of reinforcement tubes |
| 04/14/1987 | US4657093 Rolling cutter drill bit |
| 04/14/1987 | US4657091 Drill bits with cone retention means |
| 04/09/1987 | WO1987002091A1 A method and a device for deep hole drilling |
| 04/07/1987 | US4655851 Simultaneous carburizing and boronizing of earth boring drill bits |
| 04/07/1987 | US4655508 Tool component |
| 04/07/1987 | US4655303 Drill bit |
| 04/07/1987 | US4655300 Method and apparatus for detecting wear of a rotatable bit |
| 04/07/1987 | US4654948 Method for renewing the cutting face of a diamond drill bit |
| 04/07/1987 | US4654947 Drill bit and method of renewing drill bit cutting face |
| 04/07/1987 | CA1220059A1 Two-prong rotary bit, especially for use with roof drills, and insert therefor |
| 04/01/1987 | EP0216100A2 Boring ram with a piston-actuated percussion cutter |
| 04/01/1987 | CN86106885A Air pressure impact drilling method and apparatus for same |
| 03/31/1987 | US4653336 Combination soil auger and soil core sampler with sample retaining capacity |
| 03/24/1987 | USRE32380 Diamond tools for machining |
| 03/24/1987 | US4651837 Downhole retrievable drill bit |
| 03/18/1987 | EP0214795A1 Tool Component |
| 03/11/1987 | EP0213300A2 Brazed composite compact implements |
| 03/04/1987 | EP0212809A2 Rotary drill bit for coring holes in subsurface formations |
| 03/04/1987 | EP0211997A1 Undercutting tool |
| 03/04/1987 | CN86202204U Diamond core bit |
| 03/03/1987 | US4647111 Sleeve insert mounting for mining pick |
| 03/03/1987 | US4646858 Earth boring bit with air system access |
| 03/03/1987 | US4646857 Means to secure cutting elements on drag type drill bits |
| 03/03/1987 | US4646826 Well string cutting apparatus |
| 03/03/1987 | CA1218643A1 Earth boring bit with pressure compensating bearing seal |
| 02/25/1987 | EP0211642A2 Improved drag type drill bit |
| 02/24/1987 | CA1218355A1 Tooth design using cylindrical diamond cutting elements |
| 02/24/1987 | CA1218354A1 Diamond rotating bit |
| 02/24/1987 | CA1218353A1 Tooth design to avoid shearing stresses |
| 02/18/1987 | CN85106187A Under reaming pile bore excavating bucket and method of its excavation |
| 02/17/1987 | US4642987 Process and equipment for the utilization of geothermic energy |
| 02/10/1987 | US4641976 Copper-nicke-tin, roller cone rock bit |
| 02/10/1987 | US4641718 Rotary drill bit |
| 02/10/1987 | CA1217761A Method employed in deep hole drilling and a drill shaft system |
| 02/04/1987 | EP0210735A2 Improvements in or relating to drilling apparatus |
| 02/04/1987 | CN86103664A Improved composite polycrystalline diamond compact |
| 02/03/1987 | US4640375 Drill bit and cutter therefor |
| 02/03/1987 | US4640374 Rotary drill bit |
| 02/03/1987 | CA1217475A1 Rotary drill bits |
| 01/21/1987 | EP0209217A2 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| 01/21/1987 | CN85204885U Alloy rock-drill head with columnar carbide chip |
| 01/20/1987 | US4637659 Tool member for a rotary drilling tool |
| 01/15/1987 | DE3515735C1 Boring head for a percussion boring device |
| 01/14/1987 | EP0208532A2 Core sampling device |
| 01/13/1987 | US4635738 Drill bit |
| 01/06/1987 | US4633959 Drill having means for locating cutting bit in a bit holder |
| 01/06/1987 | CA1216277A1 Tubing bit opener |
| 01/06/1987 | CA1216158A1 Composite compact component and a process for the production of the same |
| 12/31/1986 | CN86104661A Brazed composite compact implements |
| 12/30/1986 | US4632401 Hermetically welded belleville seal for rock bits |
| 12/30/1986 | US4632196 Drill bit with shrouded cutter |
| 12/30/1986 | EP0206973A2 Simultaneous carburizing and boronizing of earth boring drill bits |
| 12/30/1986 | EP0206855A1 Method and device for detecting a fluid flow |
| 12/30/1986 | EP0206737A1 Abrasive tool |
| 12/30/1986 | EP0205430A1 Method for inner cleaning of a core bit with reversed fluid flushing and a core bit herefor |