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)
02/1982
02/23/1982CA1118756A1 Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement
02/23/1982CA1118755A1 Reverse action auger
02/16/1982CA1118459A1 Process of and an arrangement for mining
02/09/1982US4314616 Die-cast masonry drill with leading hard insert
02/02/1982US4313506 Drill cutter bit
01/1982
01/27/1982EP0044817A2 Drill bit
01/19/1982CA1116592A2 Drill bits embodying diamond impregnated segments
01/19/1982CA1116591A1 Earth boring apparatus
01/13/1982EP0043609A1 Rotary bit with jet nozzles
01/12/1982CA1116161A2 Drill bits embodying diamond impregnated segments
01/06/1982EP0043000A1 Drilling tool with expansible cutters
12/1981
12/29/1981US4307984 Cutting elements
12/29/1981US4307786 Borehole angle control by gage corner removal effects from hydraulic fluid jet
12/29/1981CA1115263A1 Method and device in earth cutting
12/22/1981US4306727 Dynamic seal for rolling cutter drill bit
12/22/1981US4306627 Fluid jet drilling nozzle and method
12/15/1981CA1114361A1 Universal earth formation cutter
12/08/1981US4304444 Bearing means in rotary drill bits
12/08/1981US4304440 Roller cutter
12/08/1981US4304312 Percussion drill bit having centrally projecting insert
12/08/1981US4304311 Drill string stabilizer having easily removed hard surface inserts
12/08/1981US4304309 Surface drilling apparatus
12/08/1981CA1113924A1 Earth boring bit with composite anti-galling bearing surface
12/08/1981CA1113923A1 Rotary cone cutter
12/08/1981CA1113922A1 Varied pitch rotary rock bit
12/02/1981EP0040847A2 Pressure compensating device
12/02/1981EP0040846A2 A body structure and nozzle for enhancing the flow of drilling fluid in a rotary drill bit
12/02/1981EP0040845A2 A wear compensating sealing device
12/01/1981US4303137 Method for making a cone for a rock bit and product
12/01/1981US4303136 Fluid passage formed by diamond insert studs for drag bits
12/01/1981CA1113446A2 Reamer
11/1981
11/24/1981US4301877 Clad mud nozzle
11/24/1981US4301876 Non-rotating stabilizer for raise boring
11/24/1981CA1113082A2 Reamer
11/10/1981US4299298 Down-the-hole drilling
11/10/1981US4299297 Rotary percussion bit
11/10/1981CA1112255A1 Arrangement for discharging liquid medium under high pressure
11/10/1981CA1112233A1 Seal for a rolling cone cutter earth boring bit
11/03/1981US4298080 Rock cutting tools
11/03/1981US4298079 Rotary drill bit
11/03/1981CA1111833A1 Enlarged bore hole drilling method and apparatus
11/03/1981CA1111832A1 Rotary drill bit with rotary cutter
11/03/1981CA1111831A2 Broaching head
10/1981
10/29/1981WO1981003045A1 Rotary drill bit
10/29/1981WO1981003044A1 Rotary drill bit
10/27/1981US4296973 Segmented hardfaced collar for tool joints
10/27/1981US4296825 Rock drill
10/27/1981US4296824 Nozzle placement in large diameter earth boring bits
10/27/1981US4296823 Cable tool with circulating drill stem
10/27/1981US4296822 Multipurpose fluid flow assisted downhole tool
10/27/1981CA1111411A1 Rotary drill bit with rotary cutters
10/27/1981CA1111410A2 Guiding head
10/21/1981EP0038125A2 Rolling cutter drill bit
10/21/1981EP0037819A1 Lubricating device for rotary drill bits
10/13/1981US4294492 Caliper seal assembly
10/13/1981US4294319 Cutter head for rotary percussion drills
10/13/1981CA1110613A1 Blades stabiliser with a minimum of one venturi effect spacing, particularly for use with an earth boring machine
10/06/1981US4293167 Rolling cutter drill bit with improved journal configuration
10/06/1981US4293048 Jet dual bit
10/06/1981CA1110226A1 Shaft drill bit with overlapping cutter arrangement
10/06/1981CA1110225A1 Rotating drill tool with impact device
10/01/1981WO1981002761A1 Drill tool
09/1981
09/30/1981EP0036847A2 Drill tool
09/30/1981EP0036772A2 Rolling cutter drill bit
09/29/1981US4291774 Rock-breaking implement for percussive machines
09/22/1981US4290498 Ablatible drill
09/22/1981US4290497 Automatic wear compensating seal device
09/22/1981CA1109454A1 Rotary rock bit seal recess washer
09/15/1981US4289321 Pressure shaft seal and method
09/15/1981US4289211 Rock drill bit
09/15/1981US4289210 Impact drill bit actuator
09/08/1981US4287957 Cooling a drilling tool component with a separate flow stream of reduced-temperature gaseous drilling fluid
09/08/1981CA1108597A1 Biased lubricant compensator for an earth boring drill bit
09/08/1981CA1108596A1 High performance well drilling tool with fast milling of the core
09/01/1981US4286677 Helical impact bit for drilling stone with narrow guide lips
09/01/1981CA1108120A1 System for boring raises having portions of different diameters
09/01/1981CA1108119A1 Large diameter bit with bridge mounted drive stem
09/01/1981CA1108118A1 Rotary drill bit
08/1981
08/31/1981EP0034143A4 A rotary cutterhead for an earth boring machine.
08/26/1981EP0034143A1 A rotary cutterhead for an earth boring machine.
08/25/1981US4285410 Broach for incorporation in a drill string
08/25/1981US4285409 Two cone bit with extended diamond cutters
08/25/1981US4285407 Straight hole driller
08/25/1981CA1107716A1 Earth boring bit with gridded ferrous bearing surface
08/25/1981CA1107715A1 Steep angle raise bit
08/25/1981CA1107540A1 Rotary rock bit bearing pin hardfacing system
08/19/1981EP0034106A1 Earth-compression drill bit with plane closing disc
08/18/1981US4284310 Rotary drill bit
08/18/1981US4284152 Pump in core breaker carrier
08/18/1981US4284151 Lubricating device
08/12/1981EP0033654A2 Rotary drill bits and method of use
08/11/1981US4282943 Lawn aerator
08/11/1981US4282942 Underreamer with ported cam sleeve upper extension
08/11/1981US4282941 Underreamer with large cutter elements and axial fluid passage
08/11/1981CA1106833A1 Earth boring apparatus
08/11/1981CA1106832A1 Drill bits embodying diamond impregnated segments
08/04/1981US4281722 Retractable bit system
07/1981
07/29/1981EP0032791A1 Rotary drill bits
07/28/1981US4280573 Rock-breaking tool for percussive-action machines
07/28/1981US4280571 Rock bit
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