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)
12/1999
12/08/1999CN2352664Y Taper type spiral drilling bit
12/07/1999US5996715 Mine roof drill bit and cutting insert therefor
12/07/1999US5996714 Rotatable cutting bit assembly with wedge-lock retention assembly
12/07/1999US5996713 Rolling cutter bit with improved rotational stabilization
12/07/1999CA2070684C Drill bit for well slashing
12/02/1999DE19923748A1 Boring bit for ground bores
12/01/1999EP0960261A1 Tool and method for drilling a lateral well
12/01/1999EP0960260A1 Tool for making an opening in a tubular in a wellbore
12/01/1999EP0960254A1 Reverse circulation drilling system with bit locked underreamer arms
12/01/1999CN1237222A Process and device for simultaneously drilling and lining hole
11/1999
11/30/1999US5992763 Nozzle and method for enhancing fluid entrainment
11/30/1999US5992549 Cutting structures for rotary drill bits
11/30/1999US5992548 Bi-center bit with oppositely disposed cutting surfaces
11/30/1999US5992547 Rotary drill bits
11/30/1999US5992546 Tungsten carbide
11/30/1999US5992542 Cantilevered hole opener
11/25/1999DE19821404A1 Roller chisel for tunnel boring machine
11/25/1999DE19821390A1 Roller chisel for tunnel boring machine
11/24/1999EP0959224A2 Side port nozzle in a PDC bit
11/24/1999EP0958446A2 Method and device for driving bore-holes, specially for prospection and extraction drillings
11/24/1999EP0958262A2 Method and apparatus for infiltrating preformed components and component assemblies
11/24/1999EP0958084A1 Deep drilling tool
11/24/1999CN2350518Y Drilling bit for building construction
11/24/1999CN1046783C System for insitu replacement of cutting means for a ground drill
11/23/1999US5988303 Gauge face inlay for bit hardfacing
11/23/1999US5988302 Hardmetal facing for earth boring drill bit
11/18/1999WO1999058808A1 Roller bit for tunnel-boring machines having replaceable bit points
11/17/1999EP0957232A1 Roller bit with segemented cutting rings for tunneling machines
11/17/1999EP0880418B1 Method of making a carbide cutting insert
11/16/1999US5984030 Rock drilling tool, drill bit and a method of transferring percussive energy
11/16/1999US5984024 Cutter, a stopper means and a method of preventing mud from entering into a cutter
11/16/1999US5984005 Wellbore milling inserts and mills
11/16/1999CA2075968C Apparatus and method for building a foundation for upright or for making passages therethrough
11/15/1999CA2237785A1 Drill bit and hole opener assembly and method of widening a borehole
11/10/1999EP0955446A2 Preform cutting element
11/10/1999EP0955445A2 Polycrystalline cutter element with specific interface
11/10/1999EP0955444A2 Method and apparatus for installing a house service connection using directional drilling
11/10/1999EP0750716B1 Milling tool
11/10/1999CN2348088Y Coal drill bit
11/10/1999CN1046335C Integrated drilling and rock bolting apparatus
11/09/1999US5979579 Polycrystalline diamond cutter with enhanced durability
11/09/1999US5979578 Multi-layer, multi-grade multiple cutting surface PDC cutter
11/09/1999US5979577 Stabilizing drill bit with improved cutting elements
11/09/1999US5979576 Anti-whirl drill bit
11/09/1999US5979575 Hybrid rock bit
11/09/1999US5979574 Horizontal boring apparatus and method of using the same
11/09/1999US5979573 Horizontal boring apparatus
11/09/1999US5979571 Combination milling tool and drill bit
11/03/1999CN1234093A Cutting bit assembly for impinging earth strata
11/03/1999CN1234092A Rotary-percussion drill apparatus and method
11/02/1999US5975223 Rock drill bit and method for hardening a rock drill bit
11/02/1999US5975222 Reverse circulation drilling system with bit locked underreamer arms
11/02/1999CA2165333C Method for supplying cooling medium to a grinding cup and grinding cup to carry out the method
11/02/1999CA2079893C Ring clamp for a cutter ring in a tunnel drilling machine
10/1999
10/28/1999WO1999054586A1 Method and apparatus for rotary mining
10/27/1999CN1232741A Punching tool
10/27/1999CA2270264A1 Water pressure posthole digger
10/26/1999US5971087 Reduced residual tensile stress superabrasive cutters for earth boring and drill bits so equipped
10/20/1999CN2344536Y Cone locking structure
10/19/1999US5967250 Modified superhard cutting element having reduced surface roughness and method of modifying
10/19/1999US5967249 Superabrasive cutters with structure aligned to loading and method of drilling
10/19/1999US5967248 Rock bit hardmetal overlay and process of manufacture
10/19/1999US5967247 Steerable rotary drag bit with longitudinally variable gage aggressiveness
10/19/1999US5967246 Rotary drill bits
10/19/1999US5967245 Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty
10/19/1999US5967244 Drill bit directional nozzle
10/13/1999EP0948701A1 Process and device for simultaneously drilling and lining a hole
10/13/1999EP0948700A2 Whipstock
10/12/1999US5964553 Drilling tool with internal cavities for chip removal
10/07/1999WO1999050528A1 Drillstring with stabilisers for re-entering a primary wellbore
10/06/1999EP0946309A2 Production process for casting steel-bodied bits
10/06/1999CN2342086Y Eccentric roller type scale cleaning drill
10/05/1999US5963775 Pressure molded powder metal milled tooth rock bit cone
10/05/1999US5961185 Shielded cutterhead with small rolling disc cutters
10/05/1999US5960896 For drilling a subterranean formation
09/1999
09/30/1999WO1999049175A1 Rock drilling tool and reamer for percussive drilling
09/30/1999WO1999049174A1 Rotary cone drill bit with improved bearing system
09/30/1999DE19813087A1 Drilling device with tubular outer drill stem through which injection drill stem extends
09/29/1999EP0944765A1 Drilling and/or coring tool
09/29/1999EP0944764A1 Drilling head
09/28/1999US5957228 Cutting element with a non-planar, non-linear interface
09/28/1999US5957227 Blade-equipped drilling tool, incorporating secondary cutting edges and passages designed for the removal of evacuated material
09/28/1999US5957226 Reverse circulation drilling system with hexagonal pipe coupling
09/28/1999US5957225 Drilling assembly and method of drilling for unstable and depleted formations
09/28/1999US5957224 Double bit assembly and method of using the same
09/28/1999US5957223 Bi-center drill bit with enhanced stabilizing features
09/28/1999US5957221 Downhole core sampling and testing apparatus
09/28/1999US5957006 Fabrication method for rotary bits and bit components
09/23/1999WO1999037880A8 Rotary cone drill bit with enhanced thrust bearing flange
09/23/1999WO1999037879A8 Rotary cone drill bit with enhanced journal bushing
09/22/1999CN1229452A Rotary cone drill bit with integral stabilizers
09/21/1999US5954724 Titanium molybdenum hafnium alloys for medical implants and devices
09/21/1999US5954147 Fullerenes
09/21/1999US5954146 System for in situ replacement of cutting means for a ground drill
09/16/1999DE19810193A1 Bohrwerkzeug Drilling tool
09/15/1999EP0941793A2 Drilling tool
09/14/1999US5950747 Stress related placement on engineered superabrasive cutting elements on rotary drag bits
09/14/1999US5950745 Diamond-coated button insert for drilling
09/14/1999US5950743 Method for horizontal directional drilling of rock formations
09/14/1999US5950742 Methods and related equipment for rotary drilling
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