| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 05/02/1997 | EP0770759A2 A drilling assembly for use in drilling holes in subsurface formations |
| 05/02/1997 | EP0631645A4 Down reaming apparatus. |
| 05/01/1997 | CA2189269A1 Reloring and stabilising machine for the drilling of an oil well |
| 04/30/1997 | CN1148533A Drill bit with debris conveying flute |
| 04/29/1997 | US5624068 Diamond tools for rock drilling, metal cutting and wear part applications |
| 04/29/1997 | US5624002 For forming a borehole having a side wall and bottom |
| 04/23/1997 | EP0682738B1 Drilling apparatus |
| 04/22/1997 | US5622233 Elements faced with superhard materials |
| 04/22/1997 | US5621962 Method of manufacturing chisel for impact tool |
| 04/17/1997 | WO1997013954A2 Mill for wellbore milling operations |
| 04/17/1997 | DE19537900A1 Rotary drill, such as hammer drill |
| 04/16/1997 | CN1034598C Flow control type vibration-jet device for drill bit |
| 04/15/1997 | US5620051 Whipstock |
| 04/09/1997 | CN1147286A Rotary drill bit with improved cutter |
| 04/09/1997 | CN1147285A Rotary drill bit with improved cutter and seal protection |
| 04/08/1997 | US5617928 Elements faced with superhard material |
| 04/03/1997 | WO1997012121A1 Subsurface pneumatic hammer |
| 04/02/1997 | EP0765202A1 Drilling tool with internal cavities for chip removal |
| 04/02/1997 | EP0765201A1 Drilling tool with rounded insert support surfaces |
| 04/02/1997 | EP0621919B1 Down-the-hole rock drill |
| 04/02/1997 | CN2251037Y Tri-cone rotary drilling rod |
| 04/02/1997 | CN2251036Y Drag bit |
| 04/01/1997 | US5615747 Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
| 04/01/1997 | CA2005095C Bit assembly utilizing carbide insert |
| 03/26/1997 | EP0764760A2 Cutting insert for rotary drag bit |
| 03/19/1997 | EP0763649A1 Cutting portion of a drill bit |
| 03/19/1997 | EP0763648A1 Drilling apparatus and drilling method |
| 03/19/1997 | CN1145444A Method and system of trajectory prediction and control using PDC bits |
| 03/18/1997 | US5611649 Elements faced with superhard material |
| 03/18/1997 | US5611251 Method for making inserts for cutting tools |
| 03/18/1997 | CA2086964C Insert and insert support bar |
| 03/18/1997 | CA2086963C Insert spacer assembly |
| 03/12/1997 | EP0761927A1 A masonry drill bit |
| 03/12/1997 | EP0761353A1 Drill bit |
| 03/12/1997 | EP0761323A1 Method of decontaminating polluted soils and drill head for carrying out the method |
| 03/11/1997 | US5609443 Method for drilling difficult machinable materials |
| 03/06/1997 | WO1997008426A1 Locking system |
| 03/06/1997 | WO1997008425A1 Self-centering system for a tool travelling through a tubular member |
| 03/06/1997 | WO1997008421A1 Method, drilling tool and rock drill bit for transferring impact energy from a top hammer unit |
| 03/06/1997 | WO1997008420A1 Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts |
| 03/06/1997 | WO1997008417A1 Tool for transporting cutting means to and from a ground drill |
| 03/06/1997 | WO1997008396A1 Device for widening a borehole in the ground |
| 03/06/1997 | WO1997008379A1 Retraction system for a latching mechanism of a tool |
| 03/06/1997 | CA2230573A1 Locking system |
| 03/06/1997 | CA2230569A1 Tool for transporting cutting means to and from a ground drill |
| 03/06/1997 | CA2230568A1 Retraction system for a latching mechanism of a tool |
| 03/06/1997 | CA2229159A1 Method, drilling tool and rock drill bit for transferring impact energy from a top hammer unit |
| 03/05/1997 | EP0572655B1 Drill bit with improved insert cutter pattern |
| 03/05/1997 | CN1144549A Apparatus for drilling open tunnel and drilling method |
| 03/05/1997 | CN1144149A Method for making rotary drill tool |
| 03/04/1997 | US5608162 Method and system of trajectory prediction and control using PDC bits |
| 03/04/1997 | US5607025 Drill bit and cutting structure having enhanced placement and sizing of cutters for improved bit stabilization |
| 03/04/1997 | US5607024 Stability enhanced drill bit and cutting structure having zones of varying wear resistance |
| 03/04/1997 | US5606895 Method for manufacture and rebuild a rotary drill bit |
| 02/26/1997 | EP0759118A1 Rotary borer |
| 02/26/1997 | CN2248242Y Composite fin and tooth integrated rock-drill |
| 02/26/1997 | CN2248241Y Downhole hammering device |
| 02/26/1997 | CN1143548A Method for manufacturing cylinder tooth bit of cast steel and ductile iron |
| 02/25/1997 | US5605199 Elements faced with super hard material |
| 02/25/1997 | US5605198 Stress related placement of engineered superabrasive cutting elements on rotary drag bits |
| 02/23/1997 | CA2183932A1 Multiple diamond layer polycrystalline diamond composite cutters and a method for making same |
| 02/20/1997 | WO1997006342A1 Stabiliser tool |
| 02/20/1997 | WO1997006339A1 Hardfacing with coated diamond particles |
| 02/20/1997 | WO1997006338A1 Cutting tool for drilling concrete, aggregate or masonry |
| 02/20/1997 | CA2228398A1 Hardfacing with coated diamond particles |
| 02/20/1997 | CA2201118A1 Stabiliser tool |
| 02/12/1997 | CN1142567A Diameter changeable expanding drill bit for full casing wall-protection drill |
| 02/11/1997 | US5601857 Extruder for extrusion manufacturing |
| 02/11/1997 | US5601477 Polycrystalline abrasive compact with honed edge |
| 02/11/1997 | US5601153 Rock bit nozzle diffuser |
| 02/11/1997 | US5601151 Drilling tool |
| 02/06/1997 | WO1997004214A1 Disc cutter structure |
| 02/06/1997 | WO1997004213A1 Hazardous waste characterizer and remediation method and system |
| 02/06/1997 | WO1997004209A1 Polycrystalline diamond cutter with integral carbide/diamond transition layer |
| 02/06/1997 | WO1997004182A1 Method of expanding a bore hole in ground containing hard material and a device for implementing the method |
| 02/05/1997 | EP0757154A2 Earth boring bit with improved bearing seal |
| 02/04/1997 | US5598895 Cutter assembly having a plurality of independently rotatable cutting units thereon |
| 02/04/1997 | US5598751 Cutting insert |
| 02/04/1997 | US5598750 Elements faced with superhard material |
| 01/29/1997 | CN2246188Y Blade-type directional well borer |
| 01/21/1997 | US5595255 Rotary cone drill bit with improved support arms |
| 01/21/1997 | US5595254 Tilting bit crown for earth-boring drills |
| 01/21/1997 | US5595252 Fixed-cutter drill bit assembly and method |
| 01/16/1997 | WO1997001692A1 An improved up-hole hammer drill bit |
| 01/16/1997 | CA2198377A1 An improved up-hole hammer drill bit |
| 01/15/1997 | EP0753375A2 Hardfacing material for rolling cutter drill bits |
| 01/15/1997 | CN2245113Y Long bending sprayer nozzle for roller bit |
| 01/14/1997 | US5594931 Powder metallurgy, sintering |
| 01/14/1997 | US5593231 Hydrodynamic bearing |
| 01/14/1997 | US5592996 Drill bit having improved cutting structure with varying diamond density |
| 01/14/1997 | US5592995 Earth-boring bit having shear-cutting heel elements |
| 01/14/1997 | CA2085207C Downhole cutting tool |
| 01/09/1997 | WO1997001016A1 A cutter, a stopper means and a method of preventing mud from entering into a cutter |
| 01/09/1997 | DE19625509A1 Werkzeugkomponente Tool component |
| 01/08/1997 | CN2244605Y Composite plate tooth bit |
| 01/07/1997 | US5590729 Superhard cutting structures for earth boring with enhanced stiffness and heat transfer capabilities |
| 01/07/1997 | US5590728 Elements faced with superhard material |
| 01/07/1997 | US5590727 Earth boring bit |
| 01/07/1997 | US5590726 Drilling apparatus |
| 01/07/1997 | US5590724 Underreaming method |