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)
07/1981
07/22/1981EP0032428A1 Rotary drill bits
07/21/1981US4279450 Rotary rock bit fluid center seal
07/21/1981US4279316 Earth boring bit with eccentric seal boss
07/21/1981CA1105447A1 Drilling bits for plastic formations
07/14/1981US4278363 Rock bolt and installation system
07/14/1981US4278137 Apparatus for extracting minerals through a borehole
07/14/1981US4277869 Stabilizer
07/14/1981CA1105000A1 Rock-breaking implement for percussive machines
07/14/1981CA1104999A1 No translation available
07/08/1981EP0031355A1 A drag bit for rotary rock drilling
07/07/1981US4277110 Earth boring bit with eccentric seal groove
07/07/1981US4277109 Axial compression positive rock bit seal
07/07/1981US4277106 Self renewing working tip mining pick
07/07/1981US4276946 Biased lubricant compensator for an earth boring drill bit
07/07/1981US4276942 Deviation device
07/07/1981US4276788 Process for the manufacture of a drill head provided with hard, wear-resistant elements
07/07/1981CA1104553A1 Sealing system for an earth boring cutter
07/07/1981CA1104383A1 Lubricant volume displacement system for a rotary rock bit
06/1981
06/30/1981US4275926 Down hole pump with bottom receptor
06/30/1981US4275796 Rock drilling tool
06/30/1981US4275794 Tool equipped with a percussive device
06/24/1981EP0030558A1 Deep hole rock drill bit
06/23/1981US4274840 Wear resistant composite insert, boring tool using such insert, and method for making the insert
06/23/1981US4274769 Impregnated diamond drill bit construction
06/23/1981US4274498 Rock bit lubrication system utilizing expellable plug for obtaining expansion space
06/23/1981US4274496 Method and device in earth cutting
06/23/1981CA1103656A1 Enlarged bore hole drilling method
06/17/1981EP0023487A4 Rotary cutterhead for an earth boring machine.
06/16/1981US4273202 Drilling bit for blast furnace tap holes
06/10/1981EP0030055A1 Method for producing an improved layer, particular for a drill bit
06/09/1981US4272134 Rotary drill bit
06/09/1981US4271917 Locking device for hard metal inserts
06/03/1981EP0029535A1 Compacts for diamond drill and saw applications
06/02/1981US4270812 Drill bit bearing
06/02/1981US4270618 Earth boring apparatus
05/1981
05/27/1981EP0029187A1 Improved method of making diamond compacts for rock drilling
05/26/1981CA1101837A1 Centrifugal water-air separation in earth drilling bits
05/19/1981CA1101408A1 Rock drill
05/19/1981CA1101246A1 Method for making rock bits
05/12/1981US4266830 Auger construction providing reduced noise
05/12/1981US4266622 Rotary rock bit and method of making same
05/12/1981US4266621 Well casing window mill
05/06/1981EP0028121A1 Improvements relating to downhole shearers
05/05/1981US4265325 Percussion rock bit
05/05/1981US4265324 Eccentric counterbore for diamond insert stud
04/1981
04/30/1981WO1981001167A1 Lubricating device
04/28/1981US4264682 Surface hafnium-titanium compound coated hard alloy material and method of producing the same
04/28/1981US4263976 Rotary drill bit with rotary cutters
04/28/1981CA1100126A1 Cavitating liquid jet assisted drill bit and method for deep-hole drilling
04/21/1981US4262762 Anti-collaring structure for impact bit
04/21/1981US4262761 Long-life milled tooth cutting structure
04/21/1981US4262760 Reamer-stabilizer
04/21/1981US4262759 Combination seal and pressure relief valve for sealed drill string unit
04/21/1981US4262758 Borehole angle control by gage corner removal from mechanical devices associated with drill bit and drill string
04/21/1981US4262757 Cavitating liquid jet assisted drill bit and method for deep-hole drilling
04/14/1981US4261620 Tapered lock pin for a cutter tool bit
04/14/1981US4261426 Reamer stabilizer
04/07/1981US4260203 Bearing structure for a rotary rock bit
04/07/1981CA1098895A1 Earth boring tool
03/1981
03/31/1981US4259090 Method of making diamond compacts for rock drilling
03/31/1981US4258808 Rock drill
03/31/1981US4258807 Method for making rock bits
03/31/1981US4258806 Rotary drill bit with rotary cutters
03/31/1981US4258805 Low cutter load raise head
03/24/1981US4257654 Filament wound bearing
03/24/1981CA1098131A1 Composite material containing hard metal carbide particles, and method for the production thereof
03/17/1981US4256351 Sealing system for a rolling cone cutter earth boring bit
03/17/1981US4256194 Rotary drill bit having a solid forged, unitary body
03/17/1981US4256193 Rotary drill bit with rotary cutter
03/17/1981US4256191 Intermittent high-drag oil well drilling methods and apparatus
03/17/1981US4256190 Sonically assisted lubrication of journal bearings
03/11/1981EP0024424A1 Pressure shaft seal and method
03/10/1981US4255000 Rotary drill bit
03/10/1981US4254995 Process of and an arrangement for mining
03/10/1981US4254840 Drill bit insert
03/10/1981US4254839 Radial force anti-extrusion device for sealed drill string unit
03/10/1981US4254838 Automatic depth compensating device
03/10/1981CA1097333A1 Down-the-hole drilling
03/05/1981WO1981000590A1 A rotary cutterhead for an earth boring machine
03/03/1981US4253710 High temperature sealing system for a rotary rock bit
03/03/1981US4253533 Variable wear pad for crossflow drag bit
03/03/1981US4253531 Self-balancing vibratory drill apparatus
03/03/1981CA1096851A1 Earth boring drill bit with snap ring cutter retention
02/1981
02/24/1981US4252383 Earth boring bit with eccentrically formed bearing surface
02/24/1981US4252330 Symmetrical seal for a rolling cone cutter earth boring bit
02/24/1981US4252202 Drill bit
02/24/1981US4252201 Drilling method and apparatus
02/24/1981US4252102 Cutting element for processing rocks, metal or the like
02/24/1981CA1096371A1 Cutting and drilling apparatus with threadably attached compacts
02/17/1981CA1095891A1 Reamer
02/17/1981CA1095890A1 Rock drill with hard metal drilling head
02/11/1981EP0023487A1 Rotary cutterhead for an earth boring machine.
02/10/1981US4249781 Rotary drilling bit with conically shaped rotary cutters
02/10/1981US4249622 Floating seal for drill bits
02/10/1981US4249621 Friction bearing rock bit and segment
02/10/1981CA1095506A1 Rotary drill bit with rotary cutters
02/10/1981CA1095505A1 Earth boring bit with eccentrically machined bearing pin
02/10/1981CA1095504A1 Self-cleaning raise boring head system
02/10/1981CA1095503A1 Cutter actuated rock bit lubrication system
02/10/1981CA1095502A1 Enhanced cross-flow with two jet drilling
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