Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 10 - Drill bits
Patents for E21B 10 - Drill bits (19,464)
09/1999
09/14/1999US5950740 Soil sampling apparatus
09/14/1999US5950738 Inverted cone cutter attachment for ice auger
09/13/1999CA2265154A1 Invertible auger
09/13/1999CA2261495A1 Method for milling casing and drilling formation
09/13/1999CA2259090A1 Rock drill
09/10/1999WO1999045232A1 A mill and a method for milling
09/09/1999DE19810775A1 Bore crown used for hammering in
09/08/1999EP0643792B1 Rolling cone bit with wear resistant insert
09/07/1999US5947216 Cutter assembly for rock bits with back support groove
09/07/1999US5947215 Diamond enhanced rock drill bit for percussive drilling
09/01/1999CN2336079Y Scoop chisel insert for insert bit
08/1999
08/31/1999US5944129 Surface finish for non-planar inserts
08/31/1999US5944128 Method of manufacturing a rotary drill bit
08/31/1999US5944127 Hardfacing material for rock bits
08/31/1999US5944126 Resilient, non-rotating seal for rock drill
08/31/1999US5944125 Rock bit with improved thrust face
08/26/1999WO1999042697A1 Method and apparatus for fabricating a rotary cone drill bit
08/25/1999EP0937860A1 Drill and or chisel tool
08/25/1999EP0937191A1 Rock drill
08/25/1999CN2334867Y Jet gear drill
08/25/1999CN2334866Y Direction controllable drill
08/25/1999CN1226627A Drill and/or welding tool
08/24/1999US5941461 Nozzle assembly and method for enhancing fluid entrainment
08/24/1999US5941322 Directional boring head with blade assembly
08/18/1999EP0936012A1 Elements faced with superhard material
08/17/1999US5937958 Drill bits with predictable walk tendencies
08/12/1999WO1999040291A1 Roller cone drill bit with improved thrust bearing assembly
08/11/1999EP0842346A4 Hardfacing with coated diamond particles
08/11/1999CN2332806Y Bit
08/11/1999CN1044631C Boring drill
08/10/1999US5934836 Ground anchor device
08/10/1999US5934394 Drill means
08/10/1999US5934391 Sonde housing door hold-down system
08/10/1999US5934389 Method for increasing hydraulic efficiency of drilling
08/10/1999US5934388 Method for measurement of the air flow in rock drill bits
08/05/1999WO1999039076A1 Method and apparatus for boring through a solid material
08/05/1999WO1999039075A1 Rotary cone drill bit having a ball plug weld with hardfacing
08/04/1999EP0933497A2 Drill tool
08/04/1999CN2331757Y Anti-cavitation-corrosion spray nozzle
08/04/1999CN1044506C Rock drill bit and cutting inserts
08/03/1999US5931241 Rolling cutter drill bit
08/03/1999US5931240 Drill bit concave steering channel for horizontal directional drilling
08/03/1999US5931235 Cutter head, boring jig and device and process for sea bottom boring
07/1999
07/29/1999WO1999037880A1 Rotary cone drill bit with enhanced thrust bearing flange
07/29/1999WO1999037879A1 Rotary cone drill bit with enhanced journal bushing
07/28/1999EP0930949A1 Drill bit manufacturing method
07/28/1999EP0791124A4 Stabiliser tool
07/28/1999CN2330776Y Threaded plug type reverse-check combined drill bit
07/27/1999US5928071 Abrasive cutting element with increased performance
07/27/1999US5927439 Sub-assembly for lubricating rock drill bit
07/27/1999US5927410 Drill bit nozzle and method of attachment
07/22/1999WO1999036658A1 Inserts and compacts having coated or encrusted diamond particles
07/22/1999WO1999036590A1 Hardfacing having coated ceramic particles or coated particles of other hard materials
07/22/1999WO1999036215A1 Inserts and compacts having coated or encrusted cubic boron nitride particles
07/21/1999EP0738355B1 Improvements in or relating to apparatus for use in forming piles
07/21/1999CN2329755Y Rock bit
07/21/1999CN1223323A Excavator
07/20/1999US5924502 Steel-bodied bit
07/20/1999US5924501 Predominantly diamond cutting structures for earth boring
07/14/1999EP0765201B1 Drilling tool with rounded insert support surfaces
07/13/1999US5921476 Method and apparatus for conditioning fluid flow
07/13/1999US5921331 Backreamer
07/13/1999US5921330 Carbide particles embedded in steel matrix
07/08/1999WO1999034085A1 Combined rotation drill
07/08/1999WO1999023345A3 Mill for use in a wellbore and method of milling
07/07/1999EP0781184B1 Drilling tool
07/07/1999CN1044023C Rock twist drill
07/06/1999US5919005 For securing a building foundation and other structures to a ground surface
07/01/1999DE19857930A1 Eccentric concave core cutter
06/1999
06/30/1999EP0925422A1 Apparatus and method for cutting a tubular in a wellbore
06/30/1999CN1221469A Cutting tool for use in wellbore
06/29/1999US5918105 Method of forming an insert
06/29/1999US5915486 Cutter element adapted to withstand tensile stress
06/29/1999US5915485 Ski post hole auger bit
06/24/1999WO1999019596A3 Directional drilling tool
06/23/1999CN2325505Y Bit with changeable roller
06/23/1999CN2325504Y Drill bit for geology purpose
06/17/1999WO1999029998A1 Rock drilling tool
06/16/1999EP0692062B1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill
06/16/1999EP0678150A4 Improved rotary roller reamer.
06/16/1999CN2324281Y Integral diamond drill bit
06/16/1999CN2324280Y Fast well drilling machine
06/16/1999CN1219992A Flow diverter ring for rotary drill bit and its method
06/15/1999CA2183675C Trenchless pipeline installation method with pilot hole corrective alignment
06/10/1999WO1999028686A1 Inverted cone cutter attachment for ice auger
06/10/1999WO1999028589A1 Continuous self-sharpening cutting assembly for use with drilling systems
06/10/1999WO1999028588A1 Method and apparatus for enhancing production from a wellbore hole
06/10/1999WO1999006193A3 Rotary drill arrangement
06/10/1999DE19753731A1 Gesteinsbohrwerkzeug Rock drilling
06/09/1999EP0920568A1 Cutting element tip configuration for an earth-boring bit
06/09/1999EP0920566A1 Rotary-percussion drill apparatus and method
06/09/1999EP0847477A4 Drill bit with set of underreamer arms
06/09/1999EP0788578B1 2-stage underreamer
06/09/1999CN2323127Y Single-wheel hole enlarger
06/03/1999WO1999022110A8 Pre-orienting nozzle assembly
06/03/1999WO1999006194A3 Rotary spade drill arrangement
06/02/1999EP0919691A2 Face seal having strain induced face geometry
06/02/1999EP0742867B1 Drilling bit assembly and apparatus
05/1999
05/27/1999WO1999025948A1 A rotary drill bit and a roller cutter for rock drilling
05/26/1999EP0918135A1 Polycrystalline diamond compact (pdc) cutter with improved cutting capability
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