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)
11/1989
11/14/1989US4880068 Rotary drill bit locking mechanism
11/09/1989DE3814788A1 Drill rod
11/08/1989EP0341073A1 Pipe milling tool blade and method of dressing same
11/08/1989EP0340495A2 Extrusion tool
11/08/1989EP0340340A1 Method for the production of a diamond-core bit
11/08/1989EP0340280A1 Self-propelled subsoil penetrating tool system
11/08/1989CN2047296U Clutch type diamond core drill bit
11/08/1989CN2047295U 小直径凿岩钎头 Small-diameter drill bits Drilling
11/07/1989US4878549 Wire line core barrel
11/07/1989US4878548 Nozzle retention system for a drill bit
11/02/1989EP0339776A2 Improved cutting tool and method for removing materials from well bore
11/02/1989EP0339412A2 Rock drill
11/01/1989CN2046918U Complementary hard alloy hammer drill head
11/01/1989CN2046917U Bar shaped spherical teeth bit
10/1989
10/31/1989US4877096 Replaceable cutter using internal ductile metal receptacles
10/26/1989DE3812917A1 Slotted tubular drill for earth, etc.
10/24/1989US4875532 Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material
10/24/1989CA1262455A1 Drill bit
10/18/1989CN2046150U Gouge drill of filling oil through its hole
10/18/1989CN1036430A Drill bit blade for masonry and rock drill
10/17/1989US4874047 Method and apparatus for retaining roller cone of drill bit
10/17/1989US4874046 Groove cutter for concrete bores
10/17/1989US4873895 Manufacture of rotary drill bits
10/12/1989DE3908674A1 Bit for masonry and rock drills
10/11/1989EP0336698A2 Cutting element for a rotary drill bit, and method for manufacturing such an element
10/11/1989EP0336697A2 Cutting element for a rotary drill bit, and method for manufacturing such an element
10/11/1989EP0336011A1 System and method for securing a nozzle within a drill bit
10/11/1989EP0336010A1 Percussion drill with interchangeable downhole or sideways discharging cutting or drilling head
10/11/1989CN2045776U Bit and verify unit with expanding cutting tool
10/10/1989US4872520 Flat bottom drilling bit with polycrystalline cutters
10/10/1989US4872379 Rockbit arm machining fixture and method
10/04/1989EP0335497A2 Metal-to-metal face seal for rock bits
10/04/1989EP0334934A1 Soil auger
10/03/1989US4871377 Table with sintered particles, binder matrix, thin metal layer
10/03/1989US4871037 Excavation apparatus, system and method
09/1989
09/28/1989DE3809356A1 Drill with projecting cutting edges
09/27/1989EP0334806A1 Rock core bit
09/26/1989US4869330 Apparatus for establishing hydraulic flow regime in drill bits
09/26/1989US4869329 Rock bit insert
09/26/1989CA1261317A1 Percussion rock bit
09/26/1989CA1261316A1 Drill bit
09/26/1989CA1260923A1 Revolving cutters for rock bits
09/26/1989CA1260922A1 Air pressure impact drilling method and apparatus for same
09/26/1989CA1259982A1 Combination soil auger and soil core sampler with sample retaining capacity
09/21/1989WO1989008727A1 Rock bits and inserts therefor
09/21/1989WO1989008530A1 Process and device for soldering drill bits
09/20/1989EP0332795A1 Method and apparatus for drill-crown brazing
09/19/1989US4867255 Technique for steering a downhole hammer
09/19/1989US4867015 Carburizing, heat treatment to increase hardness
09/19/1989CA1259605A1 Expendable diamond drag bit
09/19/1989CA1259604A1 Motor driven tool
09/13/1989EP0332474A1 Improvements in or relating to cutter assemblies for rotary drill bits
09/12/1989US4866245 Method for manufacturing a rotary rock bit with improved weld root geometry
09/12/1989US4865137 Drilling apparatus and cutter
09/12/1989US4865136 Pressure relief valve for roller bit
09/07/1989DE3805657A1 Drilling tool with interchangeable conveying helix
09/05/1989US4864094 Process of fabricating a cutting edge on a tool and a cutting tool made thereby
09/05/1989US4862977 Drill bit and cutter therefor
09/05/1989US4862976 Spline drive for percussion drilling tool
09/05/1989US4862974 Downhole drilling assembly, apparatus and method utilizing drilling motor and stabilizer
09/05/1989US4862591 Ice spud
08/1989
08/31/1989DE3805197A1 Free-wheeling diamond bit shank
08/30/1989EP0329915A1 Shaft for drilling tools, eccentrically arranged and rotatably mounted
08/30/1989EP0329835A2 Self drilling injection anchor
08/30/1989CN2043663U Dual-purpose drill bit for rock and coal
08/29/1989US4861350 Abrasive compact bonded to and surrounding cemented carbide support to portect support from damage
08/29/1989US4860838 Latching bit sub
08/29/1989CA1258849A1 Cutting elements for rotary drill bits
08/23/1989EP0328583A1 Improved coated pcd elements and products and methods.
08/23/1989CN2043267U Gapped longitudinal hard-alloy integral drill-rod
08/23/1989CN1034879A Improved coated pck elements and products and methods
08/22/1989US4859543 Earth working tool having a working element fabricated from cemented tungsten carbide compositions with enhanced properties
08/22/1989US4858707 Convex shaped diamond cutting elements
08/22/1989US4858706 Diamond drill bit with hemispherically shaped diamond inserts
08/22/1989US4858703 Self-propelled subsoil penetrating tool system
08/16/1989EP0327598A1 Fusion-drilling process.
08/15/1989US4856601 Drill bit with flow control means
08/09/1989CN1034587A Tooth strengthening process of steel toothed annular bit
08/08/1989US4854405 Cutting tools
08/08/1989US4854403 Stabilizer for deep well drilling tools
08/08/1989US4854396 Pivoting cutter for ice coring auger
08/08/1989CA1258262A1 Apparatus and method for forming an anlarged underground arcuate bore and installing a conduit therein
08/02/1989EP0326176A2 Reinforced rotary drill bit
08/02/1989EP0325845A1 Nozzle assembly for rotary drill bit and method of installation
08/01/1989US4852672 Drill apparatus having a primary drill and a pilot drill
08/01/1989US4852671 Diamond cutting element
08/01/1989US4852670 Drilling tool with an exchangeable feed helix
08/01/1989US4852668 Hydraulic drilling apparatus and method
08/01/1989CA1258064A1 Rock bit with improved extended nozzle
07/1989
07/26/1989EP0325272A2 Drill bit with improved steerability
07/26/1989EP0325271A2 Drill bit
07/25/1989US4851068 Method of making a sealing element
07/19/1989EP0324150A1 Drilling tool
07/18/1989US4848964 Apparatus for correcting irregularities in or enlarging an underground duct
07/18/1989US4848491 Rotary drill bits
07/18/1989US4848489 Drag drill bit having improved arrangement of cutting elements
07/18/1989US4848486 Method and apparatus for transversely boring the earthen formation surrounding a well to increase the yield thereof
07/18/1989US4848476 Drill bit having offset roller cutters and improved nozzles
07/12/1989EP0147419B1 Rotatable cutting bit
07/12/1989CN2040952U Intermittent nozzle with scour corrosion-prevention positioned ring
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