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)
08/1991
08/28/1991CA2036021A1 Intersection solution method for drill bit design
08/27/1991US5042596 Imbalance compensated drill bit
08/22/1991WO1991012406A1 A down-the-hole drill tool for drilling in advance of a casing tube
08/22/1991DE4004814A1 Drill for rock or concrete or earth - has drilling head consisting of individual points of hard metal soldered into head
08/20/1991US5040624 Seal assembly for roller cutter drill bit having a pressure balanced lubrication system
08/20/1991US5040623 Controlled true geometry rock bit with one piece body
08/20/1991US5040621 Flushing means for drilling tools
08/20/1991US5040501 Valves and valve components
08/15/1991CA2036284A1 Button sharpening
08/14/1991EP0441262A1 Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits
08/14/1991CN2082755U Deflecting inserted tooth three-gear bit
08/14/1991CN2082754U Drilling and reaming serial combined drills for laying building pipeline
08/14/1991CA2009987A1 Journal bearing type rock bit
08/13/1991US5038874 Drill bit having a flushing medium channel
08/13/1991US5038870 Ice auger cutter
08/13/1991US5038859 Cutting tool for removing man-made members from well bore
08/13/1991US5038642 Method of making drill with wear inserts
08/13/1991US5038641 Drill with improved wear inserts
08/13/1991US5038640 Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits
08/10/1991CA2034625A1 Earth boring bit with axially radiussed roller bearing race
08/09/1991CA2035285A1 Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits
08/08/1991WO1991011630A1 Self-drilling fastening
08/08/1991DE4002907A1 Cylindrical cutting head forms extension of borehole drill pipe
08/07/1991EP0439821A1 Cutting crown for casings with easily exchangeable teeth
08/07/1991CN2082312U Hollow drill bit for hammer drill
08/06/1991WO1991011631A1 Self-drilling fastening
08/06/1991US5037451 Applying abrasive particle slurry to heated substrate, setting, applying pressure pad, removing liquid, bonding under high temperature and pressure
08/06/1991US5036921 Underreamer with sequentially expandable cutter blades
08/06/1991CA1287343C Matrix bit with extended blades
08/06/1991CA1287224C Manufacture of rotary drill bits
07/1991
07/31/1991CN2081880U Auto-oiler for mine roller bit
07/30/1991US5035293 Blade or member to drill or enlarge a bore in the earth and method of forming
07/30/1991US5035291 Seafloor drilling apparatus
07/30/1991US5035071 Trench wall cutter
07/27/1991WO1991011588A1 Ring cutter for tunnel drilling in rock
07/27/1991CA2074531A1 Ring cutter for tunnel drilling in rock
07/25/1991CA2034628A1 Rotary cone type rock bits
07/24/1991EP0437855A2 Integral matrix body, method and infiltration alloy for making same
07/23/1991US5033560 Drill bit with decreasing diameter cutters
07/23/1991US5033559 Drill bit with faceted profile
07/23/1991CA1286655C Transition layer polycrystalline diamond bearing
07/18/1991WO1991010805A1 Drilling tool for percussive and rotary drilling
07/18/1991DE4000691A1 Eccentric deep hammer drill - consists of asymmetrical casing for eccentric drill activated by piston
07/18/1991CA2074076A1 Drilling tool for percussive and rotary drilling
07/17/1991EP0414751A4 Bit assembly utilizing carbide insert
07/16/1991US5032147 Heat resistance
07/16/1991US5031707 Apparatus for making holes in soil
07/16/1991CA1286282C Bit design for a rotating bit incorporating synthetic polycrystalline cutters
07/16/1991CA1286207C Process for laser hardening drilling bit cones having hard cutter inserts
07/09/1991US5030276 Coating with a metal which is a carbide former on portion contacting metal matrix carrier
07/09/1991US5030250 Manufacture of abrasive products
07/09/1991US5029657 Rock drill bit
07/09/1991US5029656 Nozzle means for rotary drill bits
07/06/1991CA2033628A1 Low melting point copper-manganese-zinc alloy for infiltration binder in matrix body rock drill bits
07/03/1991EP0435861A2 Roller cutter for a drill bit
07/03/1991EP0435447A1 Improvements in or relating to rotary drill bits
07/03/1991CN2080096U Rapid feed wear-proof hard alloy drill rod
07/02/1991US5028177 Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks
07/02/1991US5027914 Pilot casing mill
07/02/1991US5027913 Insert attack angle for roller cone rock bits
07/02/1991US5027912 Drill bit having improved cutter configuration
07/02/1991US5027911 Double seal with lubricant gap between seals for sealed rotary drill bits
06/1991
06/26/1991EP0434009A1 Drill bit and method for drilling
06/25/1991US5025875 Rock bit for a down-the-hole drill
06/25/1991US5025874 Cutting elements for rotary drill bits
06/25/1991US5025873 Self-renewing multi-element cutting structure for rotary drag bit
06/25/1991US5025871 Drilling method and rotary drill bit crown
06/20/1991WO1991009202A1 Drilling tool for widening a bore well
06/20/1991DE3939219A1 Toothed roller bit for earth and rock drilling - consists of eccentric roller bit attached to main body of drill
06/18/1991US5024539 Friction bearing and cone retention thrust system for a rock bit
06/16/1991WO1991009203A1 Downhole drill bit and bit coupling
06/16/1991CA2070634A1 Downhole drill bit and bit coupling
06/12/1991EP0430989A1 Investment casting process.
06/12/1991CN2078789U Diamond bit for petroleum drilling
06/12/1991CN2078788U Combined cutting tool for drilling
06/12/1991CN2078787U Drilling tool for enlarging the borehole of rock
06/11/1991US5022894 Diamond compacts for rock drilling and machining
06/05/1991EP0430590A1 Improvements in or relating to rotary drill bits
06/05/1991EP0429649A1 Drilling installation
06/05/1991EP0429444A1 A drill for rock and concrete
06/02/1991WO1991008371A1 Drilling bit irrigated by a fluid distributed by a fluidic oscillator
06/02/1991CA2069953A1 Drilling tool with irrigation system using a fluid distributed by a fluidic oscillator
05/1991
05/29/1991CN1012673B Power-driven tool
05/28/1991US5018590 Electromagnetic drilling apparatus
05/28/1991US5018580 Section milling tool
05/26/1991CA2030860A1 Rotary drill bits
05/26/1991CA2030859A1 Rotary drill bits
05/26/1991CA2030858A1 Rotary drill bits
05/26/1991CA2030857A1 Rotary drill bits
05/23/1991DE4000677A1 Geraet zur entnahme von bodenproben Geraet to earth sample
05/22/1991EP0428476A1 Tubular drill
05/22/1991EP0427816A1 Whirl resistant bit
05/22/1991EP0427758A1 Cemented carbide tip
05/21/1991US5016719 Rotary cone type rock bits
05/21/1991US5016718 Combination drill bit
05/21/1991CA1284315C Drilling bit with full release void areas
05/14/1991US5015128 Rotary drill apparatus
05/14/1991US5014780 Long distance section mill for pipe in a borehole
05/14/1991CA1284100C Cutting tool for cutting well casing
05/08/1991EP0425802A1 Drilling device with percussive and rotative tool
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