| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 08/28/1997 | WO1997031174A1 Axial-vortex jet drilling system and method |
| 08/28/1997 | CA2246689A1 Axial-vortex jet drilling system and method |
| 08/27/1997 | EP0791124A1 Stabiliser tool |
| 08/26/1997 | US5660421 Prospector's shovel and crevicing tool |
| 08/21/1997 | WO1997030264A2 Predominantly diamond cutting structures for earth boring |
| 08/21/1997 | WO1997030263A1 Polycrystalline diamond cutter with enhanced durability and increased wear life |
| 08/21/1997 | CA2198076A1 Leg wear protection for roller cone rock bits |
| 08/20/1997 | EP0790387A1 Hard metal plate, rock drill bit provided with such a plate and method of manufacturing same |
| 08/20/1997 | EP0790386A2 Improvements in or relating to rotary drill bits |
| 08/20/1997 | EP0789637A1 Stamping- and cutting device including a soldering jig for core drill pipes and procedure by use of such device |
| 08/19/1997 | US5657827 Auger drilling head |
| 08/14/1997 | WO1997028918A1 Method of making a carbide cutting insert |
| 08/13/1997 | EP0789130A2 A rolling cutter bit with a gage row of inserts |
| 08/13/1997 | EP0788578A1 2-stage underreamer |
| 08/13/1997 | CN1156982A 钻削刀具 Drilling tools |
| 08/12/1997 | US5655614 Self-centering polycrystalline diamond cutting rock bit |
| 08/12/1997 | US5655612 Earth-boring bit with shear cutting gage |
| 08/12/1997 | US5655611 Earth-boring bit with improved bearing seal |
| 08/07/1997 | WO1997028353A1 Diamond coated cutting tool insert and method of making same |
| 08/07/1997 | CA2243712A1 Diamond coated cutting tool insert and method of making same |
| 08/06/1997 | EP0787550A1 Drill bit |
| 08/06/1997 | CN1156492A Drill head |
| 08/05/1997 | US5653300 Method of drilling a subterranean formation |
| 08/05/1997 | US5653299 Wear resist steel matrix having a duplex microstructure of austenite and martensite; toughness, high strength |
| 08/05/1997 | US5653298 Vortex method |
| 07/31/1997 | WO1997027380A2 Method for forming a window in a tubular and apparatus for use in said method |
| 07/31/1997 | CA2242341A1 Method for forming a window in a tubular and apparatus for use in said method |
| 07/30/1997 | EP0786300A1 Composite polycrystalline diamond |
| 07/30/1997 | CN2258533Y Bedstone bottom expanding drill |
| 07/29/1997 | US5651421 Rotary drill bits |
| 07/29/1997 | US5651420 For drilling a borehole in an earth formation |
| 07/24/1997 | DE19600592A1 Drill detecting subterranean explosive devices e.g. buried mines |
| 07/23/1997 | EP0784735A1 A rock drill bit and cutting inserts |
| 07/23/1997 | EP0784734A1 A rock drill bit and cutting inserts |
| 07/23/1997 | EP0784733A1 Concave cutter bit |
| 07/23/1997 | EP0784732A1 Fixed-cutter drill bit assembly and method |
| 07/23/1997 | EP0784731A1 A drilling apparatus and method to drill a hole in different kinds of soil |
| 07/23/1997 | EP0719375A4 Negative pressure vortex nozzle |
| 07/23/1997 | CN1155317A Rotary drill bit and method for manufacturing and rebuilding thereof |
| 07/23/1997 | CN1155316A Rock bit with enhanced fluid return area |
| 07/23/1997 | CN1155315A Rotary cone drill bit with improved support arms |
| 07/23/1997 | CN1155314A Combined rotary drill bit |
| 07/23/1997 | CN1154900A Rotary-impacting-type spiral drill bit |
| 07/22/1997 | US5649789 Integrated drilling and rock bolting apparatus |
| 07/22/1997 | US5649604 Rotary drill bits |
| 07/17/1997 | WO1997025514A1 Improvements relating to tunnel-boring machines |
| 07/16/1997 | EP0607135B1 Pulsation nozzle, for self-excited oscillation of a drilling fluid jet stream |
| 07/16/1997 | CN1154731A Device and method for making a slot in an underground formation |
| 07/15/1997 | US5647449 Crowned surface with PDC layer |
| 07/15/1997 | US5647448 For use on a trenchless drill device |
| 07/15/1997 | US5647447 Bit retention device for a bit and chuck assembly of a down-the-hole percussive drill |
| 07/15/1997 | CA2017533C Drill bit having improved hydraulic action for directing drilling fluid |
| 07/10/1997 | WO1997024493A1 Method and apparatus for forming piles in-situ |
| 07/08/1997 | US5645617 Composite polycrystalline diamond compact with improved impact and thermal stability |
| 07/08/1997 | US5645323 Concave cutter bit with sacrificial constraint |
| 07/08/1997 | US5645132 Drill bit having springless check valve and method of blocking backflow during drilling |
| 07/08/1997 | US5644956 Rotary drill bit with improved cutter and method of manufacturing same |
| 07/03/1997 | WO1997023660A1 Cemented carbide body with increased wear resistance |
| 07/02/1997 | EP0781184A1 Drilling tool |
| 07/02/1997 | EP0676000A4 Drill bit having polycrystalline diamond compact cutter with spherical first end opposite cutting end. |
| 07/02/1997 | CN1153250A Method for making chisel bit for drilling rock |
| 07/01/1997 | US5642942 Thrust plugs for rotary cone air bits |
| 06/26/1997 | WO1997013954A3 Mill for wellbore milling operations |
| 06/26/1997 | DE19652208A1 Drill bit for drilling anchoring points in rock |
| 06/24/1997 | US5641029 Rotary cone drill bit modular arm |
| 06/24/1997 | US5641028 Drill bit with debris conveying flute |
| 06/24/1997 | US5641027 For drilling into surface rock |
| 06/19/1997 | WO1997021900A1 Fluid drilling system |
| 06/18/1997 | CN2256464Y Short screw drilling bit capable of changing into internal screw drilling bit |
| 06/18/1997 | CN1152269A Drilling tool with internal cavities for chip removal |
| 06/11/1997 | EP0778391A2 Rotary percussive twist drill |
| 06/11/1997 | EP0778390A2 Rotary percussive twist drill |
| 06/11/1997 | EP0778100A1 Percussion twist drill |
| 06/11/1997 | EP0777811A1 Drilling head with cutters in arrow-shaped array |
| 06/10/1997 | US5637037 Method and grinding cup for grinding buttons of a rock drilling bit |
| 06/10/1997 | US5636700 Roller cone rock bit having improved cutter gauge face surface compacts and a method of construction |
| 06/04/1997 | EP0776409A1 Integral drilling tool bit |
| 06/04/1997 | EP0693158B1 Ground displacement auger head for making piles in the ground |
| 06/03/1997 | US5634515 Geothermal heat-pump system and installation of same |
| 05/29/1997 | WO1997019249A1 A sleeve for orientating a tool |
| 05/29/1997 | WO1997019247A1 Drill bit |
| 05/28/1997 | EP0775247A1 Rock bit with enhanced fluid return area |
| 05/28/1997 | EP0775246A1 Rotary cone drill bit with improved support arms |
| 05/28/1997 | EP0775245A1 Modular rotary drill bit |
| 05/28/1997 | CN1150771A Drilling tool with rounded insert support surfaces |
| 05/27/1997 | US5632349 Vortex drill bit |
| 05/21/1997 | EP0774528A1 Rolling cutter drill bits |
| 05/21/1997 | EP0774039A1 Device and method for making a slot in an underground formation |
| 05/21/1997 | CN1150466A Rotary borer |
| 05/20/1997 | US5630479 Used as a drilling, shaping, cutting, abrading or wear resistance material |
| 05/20/1997 | US5630478 Masonry drill bit and method of making a masonry drill bit |
| 05/14/1997 | EP0772726A1 Rotary drill bit and method for manufacture and rebuild |
| 05/13/1997 | US5628585 Method and apparatus for removal of utility line and replacement with polyolefin pipe |
| 05/13/1997 | US5628376 Drilling tool bit with a carrier member and cutter members |
| 05/13/1997 | US5628375 Thrust face lubrication system for a rolling cutter drill bit |
| 05/13/1997 | US5628366 Protective arrangements for downhole tools |
| 05/09/1997 | WO1996036206A3 Method of hard facing a substrate, and weld rod used in hard facing a substrate |
| 05/07/1997 | EP0771932A1 Rectifying stabiliser to drill an oil well |
| 05/07/1997 | EP0771369A2 Method of hard facing a substrate, and weld rod used in hard facing a substrate |
| 05/06/1997 | US5626201 Disc cutter and method of replacing disc cutters |