| Patents for E21B 10 - Drill bits (19,464) |
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| 08/06/1998 | WO1998034007A1 Tool and method for drilling a lateral well |
| 08/06/1998 | WO1998034006A1 Tool for making an opening in a tubular in a wellbore |
| 08/06/1998 | DE19703994A1 Drill with one main and two subsidiary cutter blades |
| 08/04/1998 | US5789686 Composite cermet articles and method of making |
| 08/04/1998 | US5788430 Drilling tool for rotary percussion drilling |
| 08/04/1998 | US5788001 Elements faced with superhard material |
| 08/04/1998 | US5788000 Stabilizer-reamer for drilling an oil well |
| 08/04/1998 | US5787999 For attachment to a down hole pneumatic hammer |
| 08/04/1998 | US5787978 Multi-face whipstock with sacrificial face element |
| 08/04/1998 | CA2125335C Ultra hard insert cutters for heel row rotary cone rock bit applications |
| 07/30/1998 | WO1998032951A2 Method and device for driving bore-holes, especially in the sea bed, using a guide tip |
| 07/30/1998 | WO1998032945A1 Reverse circulation drilling system with bit locked underreamer arms |
| 07/30/1998 | WO1998032564A1 Deep drilling tool |
| 07/30/1998 | CA2279224A1 Reverse circulation drilling system with bit locked underreamer arms |
| 07/29/1998 | EP0855490A2 Drilling apparatus and downhole torque generator |
| 07/29/1998 | EP0855489A2 Earth displacement drill |
| 07/28/1998 | US5787022 Stress related placement of engineered superabrasive cutting elements on rotary drag bits |
| 07/28/1998 | US5785258 Method and apparatus for conditioning fluid flow |
| 07/28/1998 | US5785135 Earth-boring bit having cutter with replaceable kerf ring with contoured inserts |
| 07/28/1998 | US5785134 System for in-situ replacement of cutting means for a ground drill |
| 07/23/1998 | DE19702053A1 Drilling machine for opening holes in plaster layer of wall |
| 07/22/1998 | EP0853521A1 Masonry drill bit |
| 07/22/1998 | CA2227602A1 Earth displacement drill |
| 07/21/1998 | CA2129559C Core cutting rock bit |
| 07/21/1998 | CA2073259C Drill bit having enhanced stability |
| 07/15/1998 | EP0853184A2 Superabrasive cutting element with enhanced stiffness, thermal conductivity and cutting efficency |
| 07/15/1998 | CN2286238Y Single-cone rotary drill bit |
| 07/14/1998 | US5780063 Apparatus for producing a hard metal or ceramic rod having helical bores |
| 07/14/1998 | US5779403 Percussive blow assisted rotary drill |
| 07/14/1998 | US5778994 Bit for boring earthen formations |
| 07/14/1998 | US5778991 Directional boring |
| 07/14/1998 | CA2159873C Drill bit with protruding insert stabilizers |
| 07/14/1998 | CA2144116C O-ring seal for rock bit bearings |
| 07/09/1998 | DE19653155C1 Rock driller |
| 07/08/1998 | EP0852283A2 Polycrystalline diamond cutting element with diamond ridge pattern |
| 07/08/1998 | CN2285818Y Impact press-in single roller bit |
| 07/08/1998 | CN1187154A Masonry drill bit and mosaic method |
| 07/07/1998 | US5776593 Self-sharpening; mining, construction and agriculture uses |
| 07/07/1998 | US5775446 Nozzle insert for rotary rock bit |
| 07/07/1998 | US5775443 For drilling a well bore hole in a formation |
| 07/02/1998 | DE19651586A1 Light, efficient piling rig including drilling tool with cased section carrying shallow spirals |
| 07/01/1998 | EP0851092A1 Drill bit provided with shock absorbers |
| 07/01/1998 | EP0774039B1 Device and method for making a slot in an underground formation |
| 07/01/1998 | EP0627040B1 Method for overburden drilling, casing shoe and casing tube for the method, and coupling element for the casing tubes |
| 06/30/1998 | CA2118389C Seal protection for rock bits |
| 06/25/1998 | WO1998027311A1 Drilling and/or coring tool |
| 06/25/1998 | WO1998027310A1 Drilling head |
| 06/25/1998 | WO1998027309A1 Rock drill bit |
| 06/25/1998 | DE19654597A1 Especially low cost rotary coring drill without spirals for cuttings, used with or without percussion |
| 06/25/1998 | CA2274026A1 Rock drill bit |
| 06/24/1998 | CA2223728A1 Drilling tool with shock dampers |
| 06/23/1998 | US5769175 Cutter assemblies for rotary drill bits |
| 06/23/1998 | US5769166 Wellbore window milling method |
| 06/23/1998 | CA2155392C Drill bit having enhanced cutting structure and stabilizing features |
| 06/23/1998 | CA2147077C Rock bit with mechanical seal |
| 06/17/1998 | EP0847478A1 Tool for transporting cutting means to and from a ground drill |
| 06/17/1998 | EP0847477A1 Drill bit with set of underreamer arms |
| 06/17/1998 | EP0847476A1 Method, drilling tool and rock drill bit for transferring impact energy from a top hammer unit |
| 06/16/1998 | US5765653 Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter |
| 06/16/1998 | CA2144363C O-ring seal for rock bit bearings |
| 06/10/1998 | EP0846835A2 Concrete- or rock drill bit with helical evacuation grooves |
| 06/10/1998 | EP0846217A1 Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts |
| 06/10/1998 | CN1038702C Rotating drill |
| 06/09/1998 | US5765095 Polycrystalline diamond bit manufacturing |
| 06/09/1998 | US5762843 Method of making composite cermet articles |
| 06/05/1998 | CA2192131A1 Drilling with casing and retrievable bit-motor assembly |
| 06/04/1998 | WO1998023402A2 Production process for casting steel-bodied bits |
| 06/04/1998 | DE19702983C1 Drilling head adapting efficiently to both soft and hard going |
| 06/04/1998 | CA2271559A1 Production process for casting steel-bodied bits |
| 06/03/1998 | EP0561957B1 Cold headed center vacuum drill bit |
| 06/03/1998 | CN1183824A Rotary cone drill bit modular arm |
| 06/03/1998 | CA2223764A1 Soil-displacing screw auger and method for making a concrete pile with this auger |
| 06/02/1998 | US5758733 Earth-boring bit with super-hard cutting elements |
| 05/28/1998 | WO1998022689A2 Whipstock |
| 05/27/1998 | EP0843772A1 Cutting tool for drilling concrete, aggregate or masonry |
| 05/27/1998 | CN2282598Y Hob for cutting rock |
| 05/27/1998 | CN1183131A Tubular actuator component for use in a drill-string |
| 05/26/1998 | US5755301 Inserts and compacts with lead-in surface for enhanced retention |
| 05/26/1998 | US5755299 Hardfacing with coated diamond particles |
| 05/26/1998 | US5755298 Hardfacing with coated diamond particles |
| 05/26/1998 | US5755297 Rotary cone drill bit with integral stabilizers |
| 05/26/1998 | US5755285 Method for decontaminating soil containing harmful substances and boring head for carrying out the method |
| 05/22/1998 | WO1998021442A1 Rock drill |
| 05/22/1998 | WO1998021441A1 Steel-bodied bit |
| 05/22/1998 | WO1998021440A1 Gauge face inlay for bit hardfacing |
| 05/22/1998 | WO1998021439A1 Process and device for simultaneously drilling and lining a hole |
| 05/20/1998 | EP0843072A1 Drill tip for soil drilling apparatus |
| 05/20/1998 | EP0842346A1 Hardfacing with coated diamond particles |
| 05/19/1998 | US5752573 Earth-boring bit having shear-cutting elements |
| 05/14/1998 | DE19734094A1 Drill bit for boring into masonry especially concrete |
| 05/14/1998 | DE19734093A1 Drill bit for boring into masonry especially concrete |
| 05/13/1998 | EP0841466A1 Disc cutter structure |
| 05/13/1998 | EP0841463A2 Preform cutting element for rotary drill bits |
| 05/13/1998 | CN2281412Y Stable PDC drill bit |
| 05/13/1998 | CN2281411Y Drill bit with steel body and circular blades |
| 05/05/1998 | US5746281 Method for mounting hard metal buttons in a drill bit |
| 05/05/1998 | US5746280 Earth-boring bit having shear-cutting inner row elements |
| 05/05/1998 | US5746095 Method of forming rotary drilling tools |
| 05/05/1998 | CA2151685C Rock bit |
| 04/29/1998 | EP0837979A1 Drill bit retainer for a down hole hammer assembly |