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)
08/1990
08/16/1990EP0381793A1 Method of forming a cutting element having a V-shaped diamond cutting face
08/16/1990DE3904105A1 Method and device for taking soil samples
08/14/1990US4947945 Tungsten
08/14/1990US4947943 Fisherman's gear-storing ice auger
08/13/1990CA2009861A1 Drill bit
08/08/1990EP0381648A1 Method to increase the strength of an element for percussive drilling
08/08/1990CN1044429A Fixation of multicrystal drilling tooth to diamond bit
08/02/1990CA2009179A1 Method to increase the strength of an element for percussive drilling
08/01/1990EP0380469A2 Tool carrier for the excavation tools of winning or driving machines
08/01/1990EP0379743A1 Method for cleaning soil by conducting through a heated medium
08/01/1990EP0379584A1 Instrument for percussion-rotary drilling
08/01/1990CN2059935U Screw extruding drilling tool
07/1990
07/31/1990US4944774 Hard facing for milled tooth rock bits
07/26/1990WO1990008244A1 Arrangement for reducing seal damage between rotatable, and stationary members
07/26/1990WO1990008243A1 Manhole cutter
07/26/1990CA2008567A1 Combination drill bit
07/25/1990EP0378964A2 Trepanning tool
07/24/1990US4943488 Low pressure bonding of PCD bodies and method for drill bits and the like
07/24/1990US4942933 Relating to rotary drill bits
07/24/1990US4942931 Drilling tool having frictionally rotatable drilling head
07/24/1990US4942930 Lubrication system for an earth boring drill bit and methods for filling and retrofit installing thereof
07/18/1990EP0378348A1 A cast-in-place piling method and apparatus
07/18/1990EP0377585A1 Annular shim for construction bit having multiple perforations for stress relief
07/17/1990US4941892 Tool component
07/17/1990US4941891 Tool component
07/17/1990US4941783 Drilling device
07/17/1990US4941711 Cemented carbide tip
07/17/1990US4941538 One-piece drill bit with improved gage design
07/12/1990WO1990007626A1 Instrument for percussion-rotary drilling
07/12/1990DE3900453A1 Drill head of a horizontal heading machine
07/11/1990EP0377042A1 Device for making wells in ground
07/10/1990US4940099 Cutting elements for roller cutter drill bits
07/10/1990US4940097 Fluid powered rotary percussion drill with formation disintegration inserts
07/04/1990EP0376433A1 Cutting tool for removing packers or the like from wells
07/03/1990US4938538 Excavating tool cutting insert
06/1990
06/28/1990WO1990007033A1 Bit assembly utilizing carbide insert
06/26/1990US4936398 Rotary drilling device
06/21/1990DE3842377A1 Boring tool for widening pre-bored holes
06/21/1990DE3842376A1 Device for boring chimney shafts
06/20/1990CN2058424U Auto-control hydraulic broken cutting tool
06/19/1990US4934467 Drill bit wear resistant surface for elastomeric seal
06/19/1990CA1270479A1 Tubing bit opener
06/13/1990DE3841128A1 Drilling tool
06/13/1990CN2058204U Split type wire rope percussion drill bit
06/12/1990US4932484 Whirl resistant bit
06/06/1990EP0371533A1 Method for providing concrete foundation piles and hallow earth drill to be used for that purpose
06/06/1990CN1008287B Artificial diamend accumulating crystal-hard material cpd. tool tooth
06/06/1990CN1008286B Drilling apparatus and cutter
06/05/1990US4931068 Heat treatment, rearrangement, compaction, cooling
05/1990
05/31/1990WO1990005830A1 Boring bit
05/31/1990WO1990005829A1 Well expander
05/30/1990EP0370717A1 Diamond drag bit for soft formations
05/30/1990EP0370199A1 Drill bits utilizing polycrystalline diamond grit
05/29/1990US4928777 Cutting elements for rotary drill bits
05/23/1990DE3819462C1 Drilling head for making small-diameter and large-diameter boreholes
05/22/1990US4926950 Method for monitoring the wear of a rotary type drill bit
05/15/1990US4925344 Method and apparatus for replacing buried pipe
05/15/1990US4924953 Rock drill
05/15/1990US4924951 Manhole cutter
05/15/1990US4924948 Shock absorbing bit retaining ring
05/09/1990EP0367718A2 Drilling tool
05/09/1990EP0367240A1 Adaptor for drilling strings with a controllable air passage
05/08/1990US4923020 Rock bit with rigid face seals and recessed energizers
05/01/1990US4921056 Hammer drills for making boreholes
04/1990
04/25/1990EP0365100A2 Rotary drill bit for drilling through sticky formations
04/24/1990US4919221 Impact drill bit assembly and replaceable parts thereof
04/24/1990US4919220 Cutting structures for steel bodied rotary drill bits
04/24/1990US4919013 Preformed elements for a rotary drill bit
04/19/1990DE3933168A1 Slit wall cutter with counter-rotating cutter wheels - which have rolling tools on their peripheries, overhung in bearings
04/18/1990EP0363734A2 Drilling tool with a helical conveying part
04/18/1990CN2056188U Jet-lengthening apparatus for drill bit
04/18/1990CN1041418A Boosting method and equipment without jack
04/17/1990US4917196 Excavating tooth for an earth auger
04/11/1990EP0363313A2 Hollow stone-drilling tool
04/11/1990CN1007529B Reaming shell and its cutting tool
04/10/1990US4915182 Cutter elements for hollow drill bit
04/10/1990US4915181 Tubing bit opener
04/04/1990EP0361189A1 Drilling tool with helical shaft
04/04/1990CN2055530U Bit for cutting core
04/03/1990US4914268 Beam welding process
04/03/1990US4913247 Drill bit having improved cutter configuration
04/03/1990US4913246 Rotary gad for ground drill
04/03/1990US4913244 Large compact cutter rotary drill bit utilizing directed hydraulics for each cutter
03/1990
03/28/1990EP0360111A1 Preformed elements for a rotary drill bit
03/28/1990CN1040845A Percussion-rotary drilling tool
03/27/1990US4911729 Overburden eliminator rock drill bit
03/27/1990US4911255 Means for retaining roller cutters on rotary drill bit
03/27/1990US4911254 Polycrystalline diamond cutting element with mating recess
03/27/1990US4911253 Core and water collector
03/22/1990WO1990002864A1 A borehole, as well as a method and an apparatus for forming it
03/21/1990EP0358786A1 Superimposing drilling device
03/20/1990US4909720 For the production of a drill blank
03/14/1990EP0358526A2 Abrasive compacts
03/14/1990EP0357723A1 Rock bits and inserts therefor
03/14/1990CN2054480U Rock anchor rod counterboring bit
03/14/1990CN2054479U Oscillating pulse jet stream nozzle for gear wheel bit
03/13/1990US4907665 Cast steel rock bit cutter cones having metallurgically bonded cutter inserts
03/13/1990US4907664 Rock cutting tool
03/13/1990US4907662 Rotary drill bit having improved mounting means for multiple cutting elements
03/13/1990US4907659 Powered soil-sampler
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