| Patents for E21B 3 - Rotary drilling (4,061) |
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| 01/22/2014 | CN103527075A Power head filtering device of rotary drilling rig |
| 01/22/2014 | CN103527074A Duplex-pump structural pump station of drilling machine |
| 01/22/2014 | CN103527073A Rotation controlling hydraulic circuit system for rotary drilling rig |
| 01/22/2014 | CN103527072A Mining guide rail type emulsified liquid hydraulic drilling rig |
| 01/22/2014 | CN103527071A 旋挖钻机液压系统 Rotary drilling rig hydraulic system |
| 01/22/2014 | CN103526746A Full-thread pile pouring machine extruding soil body and pile-forming construction method thereof |
| 01/21/2014 | US8631882 Drilling rig with torque measuring top drive |
| 01/16/2014 | US20140014386 Power tool with battery pack ejector |
| 01/15/2014 | CN203394345U Ground anchor machine special for traction in power transmission line construction |
| 01/15/2014 | CN203394344U Petroleum grid electricity direct-current drilling machine |
| 01/15/2014 | CN203394343U Multifunctional drilling machine for use at high and low altitudes |
| 01/15/2014 | CN103510845A Double-rod hydraulic drilling machine |
| 01/15/2014 | CN102400640B Center adjusting device of rotary mechanism and method |
| 01/14/2014 | CA2726969C Systems and methods using a continuously variable transmission to control one or more system components |
| 01/08/2014 | EP2681396A2 Methods of forming polycrystalline tables and polycrystalline elements and related structures |
| 01/08/2014 | EP2681395A2 Methods of forming polycrystalline tables and polycrystalline elements and related structures |
| 01/08/2014 | CN203383726U Power head lifting device of portal frame type core drill |
| 01/08/2014 | CN203383725U Gyrator device of gantry type core drill |
| 01/08/2014 | CN203383724U Power head device of gantry type core drill |
| 01/08/2014 | CN203383723U Spiral drilling machine for continuous forming of concrete piles |
| 01/08/2014 | CN203383722U Hydraulic vertical-lifting digging machine |
| 01/08/2014 | CN203383721U Pole pit digging device |
| 01/08/2014 | CN203383207U Multi-shaft cement-soil mixing pile machine with novel power system |
| 01/08/2014 | CN103498638A Underwater top driving device for deep-layer continuous coring |
| 01/07/2014 | CA2747864C Top drive interlock |
| 01/01/2014 | CN203374201U Top-driving drilling device with inserted inner sleeve |
| 01/01/2014 | CN203374200U Air distribution device for power-head drilling rig and rotary-table drilling rig |
| 01/01/2014 | CN203374199U Coal underground drill rig |
| 01/01/2014 | CN103485712A Hard retaining wall hole bottom propulsion power head |
| 12/25/2013 | CN203362162U Ming hydraulic water exploring and stripping integrative machine |
| 12/25/2013 | CN203362031U Rotary excavating drilling machine four-driving power device |
| 12/25/2013 | CN203362030U Long spiral power head buffer device and multifunctional power head buffer device of rotary drilling rig |
| 12/25/2013 | CN203362029U Rotary excavating drilling machine chain wheel or sliding wheel power head device |
| 12/25/2013 | CN203362028U Power head operation platform of rotary drilling rig |
| 12/25/2013 | CN203362027U Variable center power head structure of rotary drilling rig |
| 12/25/2013 | CN203362026U Power head capable of preventing sand from entering box body |
| 12/25/2013 | CN203362025U Power head improving bearing abrasion caused by oil starvation |
| 12/25/2013 | CN203362024U Power head shared by rotary drill and long spiral drilling machine |
| 12/25/2013 | CN103477015A Methods of forming polycrystalline tables and polycrystalline elements and related structures |
| 12/25/2013 | CN103477014A Rotation unit, rock drilling unit and method for rock drilling |
| 12/25/2013 | CN103470179A Rotary drilling rig |
| 12/25/2013 | CN102373880B Power water tap |
| 12/18/2013 | CN102619465B Method and device for braking revolution of upper car of rotary drilling rig |
| 12/18/2013 | CN102587829B Drilling tool and piling machine |
| 12/17/2013 | US8607898 Force compensator for top drive assembly |
| 12/11/2013 | CN203335013U Top-drive blowout preventer switch for drilling machine |
| 12/11/2013 | CN203334948U Dual-power hydraulic drive rotary plate |
| 12/11/2013 | CN103443386A Methods of forming polycrystalline tables and polycrystalline elements and related structures |
| 12/11/2013 | CN103438244A Bypass valve good in protection |
| 12/11/2013 | CN103438242A Bypass valve for oil drill pipe |
| 12/11/2013 | CN103437706A Power head structure for horizontal directional drilling machine |
| 12/11/2013 | CN103437702A Cycloidal power head with simply supported beam type pins for transmitting high axial force |
| 12/11/2013 | CN103437701A Local electric rotary drilling device |
| 12/11/2013 | CN102383721B Multi-head gripper for full-sleeve full-rotation drill |
| 12/10/2013 | US8602125 Switch arrangement for controlling operation of a motor of a power tool |
| 12/10/2013 | CA2749221C Thrust bearing assembly for a wireline-operated directional core barrel drill |
| 12/04/2013 | CN203321308U Hollow motor direct-drive drilling unit |
| 12/04/2013 | CN203321307U Drilling tool for measuring thickness of sea ice and river ice during drilling |
| 12/04/2013 | CN102561940B Mechanical single-arm type hydraulic roof-bolter |
| 11/28/2013 | WO2013174089A1 Cathead and rotary drilling rig |
| 11/28/2013 | WO2013174087A1 Pulley mechanism and rotary drilling rig |
| 11/27/2013 | CN203309011U Speed reducer used for oil drilling rig |
| 11/27/2013 | CN103410452A Threaded pile, spiral drilling machine for forming threaded pile and pile-forming construction method thereof |
| 11/27/2013 | CN103410435A High-speed electric drive top driver used for deep hole coring |
| 11/27/2013 | CN103410434A Abrasion-resisting plate anti-release structure of drilling rig sliding device |
| 11/27/2013 | CN103410433A Spring type mechanical buffering and floating device of drilling rig |
| 11/27/2013 | CN102536111B High-torque drilling machine with power-shifting gearbox |
| 11/20/2013 | CN203296698U Rotary drilling tool and rotary drilling machine for exploration |
| 11/20/2013 | CN203296685U Kilometer drilling machine |
| 11/20/2013 | CN203296680U Safe fixing device for rotating disk of oil drilling platform |
| 11/20/2013 | CN203296679U Wellhead driving device for turntable of petroleum drill rig |
| 11/20/2013 | CN203296678U Power head structure of horizontal directional drilling machine |
| 11/20/2013 | CN102409969B Power head of rear cover-plate type rotary drilling rig and installation method thereof |
| 11/19/2013 | US8584771 Machine tool having an electric drive motor |
| 11/19/2013 | US8584770 Spindle bearing arrangement for a power tool |
| 11/14/2013 | WO2013085774A3 Torque track system and method |
| 11/13/2013 | CN203285418U Power head hydraulic control device and rotary drilling rig |
| 11/13/2013 | CN203285332U Pit digging tool for electric pole |
| 11/13/2013 | CN203285329U Floor type apparatus for rotating and elevating drilling tool of piling machine |
| 11/13/2013 | CN203285328U Seismic exploration composite drilling tool |
| 11/13/2013 | CN102003137B Drilling equipment and method |
| 11/07/2013 | WO2013166184A1 Tension link for drill floor substructure assembly |
| 11/06/2013 | CN203271588U Wheel type truck-mounted drilling rig |
| 11/06/2013 | CN203271583U Power head capable of driving drill to enter rock |
| 11/06/2013 | CN203271582U Power head capable of improving impact interference in systems |
| 11/06/2013 | CN203271581U Perforating machine for drilling holes |
| 11/06/2013 | CN103382809A Vehicle-mounted electric hydraulic vibratory well drilling machine |
| 11/06/2013 | CN102434092B Down-the-hole oil pressure rotating device with oil distribution structure |
| 11/06/2013 | CN101652530B Top drive apparatus |
| 11/06/2013 | CN101603411B Drilling rig and drilling method |
| 11/05/2013 | US8573324 Battery for a power tool |
| 10/31/2013 | WO2013163603A1 Bearing apparatus and methods |
| 10/31/2013 | US20130284479 Small machine tool |
| 10/31/2013 | US20130284459 Bearing apparatus and methods |
| 10/30/2013 | CN203257325U Long spiral drilling machine |
| 10/30/2013 | CN101967954B Rotary table device of rotary drilling machine |
| 10/29/2013 | US8567521 Power tool |
| 10/29/2013 | CA2727134C Systems and methods using a continuously variable transmission to control one or more system components |
| 10/29/2013 | CA2634223C Modular top drive |
| 10/24/2013 | WO2013158096A1 Drilling assembly with high-speed motor gear system |