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)
12/1990
12/19/1990EP0402624A2 Rotation-percussion drill bit for a portable drilling machine
12/19/1990EP0402470A1 Instrument for percussion-rotary drilling
12/18/1990US4978260 Cutting tool for removing materials from well bore
12/18/1990US4978173 Tooth holder
12/18/1990CA1277975C Process to sink an in-ground pile, as well as boring machine and device used in said process
12/13/1990WO1990015220A1 Rock drilling bit
12/13/1990DE3918799A1 Core drilling in rock and ice - uses hydraulic breaker flat jacks as side cutters to enlarge boreholes and to remove debris
12/12/1990EP0402337A2 Drill tool
12/11/1990US4976325 Fluted cutting tool and method of producing same
12/11/1990US4976324 Drill bit having diamond film cutting surface
12/11/1990US4976323 Counterboring device for wells
12/09/1990CA2018445A1 Drill tool
12/05/1990CN2066888U 组合钎头 Combination drill head
12/05/1990CN2066887U Geology drill bit
12/05/1990CN2066886U Guide for drilling
12/04/1990US4974690 Adapter for drilling strings with controllable air passage
12/04/1990US4974688 Steerable earth boring device
12/04/1990US4974498 Synthetic diamond protective coating
11/1990
11/29/1990WO1990014494A1 Drilling installation
11/28/1990EP0399679A2 Diamond-containing cemented metal carbide
11/28/1990EP0269638B1 A method and a device for deep hole drilling
11/27/1990US4972912 Diamond insert
11/27/1990US4972637 Abrasive products
11/27/1990CA1276948C Tunneling machine rotatable member
11/26/1990CA2016085A1 Diamond-containing cemented metal carbide
11/22/1990EP0398776A1 Tool composition with an active part made of polycristalline diamond
11/22/1990EP0397872A1 Well expander
11/22/1990DE3915973A1 Cylindrical boreholes in gas-foamed concrete - are produced by device with shaft and enlarged cylindrical head with rounded end
11/21/1990CN2066071U Rooting three cone bit
11/21/1990CN1010489B Under reaming pile bore excavating bucket and method of its excavation
11/20/1990US4971163 Drilling bucket apparatus for cast-in-place piles with expanded bottoms
11/15/1990DE3915722A1 Drill for prodn. of large hole - has sliding tapering bolt forming self-locking clamp for interchangeable tool shank
11/15/1990DE3915538A1 Rotary hard-rock drill - has eccentrically-mounted hammer in housing with milling teeth on bottom edge
11/14/1990EP0397629A2 Rock working tool
11/14/1990EP0397417A1 Milling apparatus with replaceable blades
11/14/1990EP0397323A1 Jet bit with onboard deviation means
11/14/1990CN1010420B Gang drill construction
11/13/1990US4969378 Case hardened roller cutter for a rotary drill bit and method of making
11/09/1990CA2014765A1 Rock working tool
11/08/1990CA2014872A1 Jet bit with onboard deviation means
11/07/1990EP0395769A1 Boring bit
11/06/1990US4968101 Vertical asphalt and concrete miller
11/06/1990US4967855 Drilling tool
11/06/1990US4967854 Double cone cutting head for a drill bit
10/1990
10/31/1990EP0395608A2 Tool for cutting solid material
10/31/1990EP0395572A1 Two-cone bit with non-opposite cones
10/30/1990US4966502 Hollow drilling tool
10/28/1990CA2015582A1 Drill string separation device
10/24/1990EP0383861A4 Diamond compact possessing low electrical resistivity
10/24/1990CN1046366A Whirl rsistant bit
10/18/1990WO1990012193A1 Coupling for drilling machine with dust extractor
10/18/1990WO1990012192A1 Whirl resistant bit
10/18/1990WO1990012191A1 Triangular oil well drill bit
10/18/1990DE3911567A1 Percussion pin drill for drilling in rock and/or minerals
10/17/1990EP0392755A1 A milling tool and combined stabiliser
10/17/1990CN1046196A Quick thermal treatment process of tooth palm of drill toothed wheel
10/16/1990US4962822 Downhole drill bit and bit coupling
10/11/1990DE3911159A1 Coupling for drill pipe with force transmission
10/10/1990EP0391874A2 Flushing means for drilling tools
10/10/1990EP0391873A2 Drilling tool
10/10/1990EP0391683A1 Drilling
10/10/1990CN2063572U Countercirculation core drill with water controlling means
10/10/1990CN1046013A Engineering geology drilling device without pump
10/06/1990CA2062316A1 Eccentric drilling tool
10/03/1990EP0389800A1 Method for producing polycrystalline compact tool blanks with flat carbide support/diamond or CBN interfaces
10/03/1990CN2063162U Spoon tooth for tooth-inserted indented drill bit
10/03/1990CN1009847B Air pressure impact drilling method and apparatus for same
10/02/1990US4960643 Composite synthetic materials
10/02/1990US4959929 Tool insert
09/1990
09/30/1990CA2008847A1 Method for producing polycrystalline compact tool blanks with flat carbide support/diamond or cbn interfaces
09/26/1990CN2062759U Drill bit of post hole digger for digging and leveling
09/20/1990WO1990010372A1 Improvements in or relating to tools
09/11/1990US4956238 Manufacture of cutting structures for rotary drill bits
09/11/1990US4955440 Rotary drill bits with plural sealing systems
09/05/1990EP0385883A1 Method for supporting a mining wall by means of mud injection, tool and injection shield therefor
09/05/1990EP0385673A1 Downhole milling tool and cutter therefor
09/05/1990CN1045147A Imbalance compensated drill bit
09/04/1990US4954139 Method for producing polycrystalline compact tool blanks with flat carbide support/diamond or CBN interfaces
09/04/1990US4953642 Rock drill bit
09/04/1990US4953641 Two cone bit with non-opposite cones
09/04/1990US4953640 Quick detach bit
09/04/1990US4953638 Method of and apparatus for drilling a horizontal controlled borehole in the earth
09/04/1990CA1273563A1 Method and device for detecting a fluid flow
08/1990
08/29/1990EP0384734A1 Imbalance compensated drill bit
08/29/1990EP0384623A1 Improvements in or relating to cutting elements for rotary drill bits
08/29/1990EP0383861A1 Diamond compact possessing low electrical resistivity.
08/29/1990CN2061202U Multi-chamfered groove drill bit
08/29/1990CN2061201U Controllable split-flow type core drilling device
08/28/1990US4951762 Drill bit with cemented carbide inserts
08/28/1990US4951761 Rock drill
08/23/1990WO1990009508A1 Device for taking soil samples
08/23/1990DE3916505C1 Drilling tool for producing large and small boreholes - includes bolts on replaceable holder in which there are nodular cutting inserts
08/23/1990DE3905106A1 Deep-hole hammer drill with water-flushing arrangement
08/22/1990EP0383737A1 Drill bit
08/22/1990EP0383508A2 Improvements in or relating to methods of manufacturing cutter assemblies for rotary drill bits
08/22/1990EP0382774A1 Improvement to the method of compaction-reinforcement-injection or decompaction-draining of grounds by means of auxiliary tubes.
08/21/1990US4950557 Composite diamond or boron nitride compacts strongly bonded to support
08/21/1990US4949795 Rotary rapid excavation system
08/21/1990US4949598 Manufacture of rotary drill bits
08/16/1990EP0382607A1 Device for forming piles in the soil using a continuous hollow screw
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