| Patents for E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose (2,187) |
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| 03/31/2010 | CN201433789Y Ascending hole coal-bed gas pressure detection water pressure eliminator |
| 03/31/2010 | CN201433788Y Descending hole coal-bed gas pressure detection water pressure eliminator |
| 03/24/2010 | CN201428472Y Gas intake, exhaust and flow guide system for ventilation oxidation unit |
| 03/24/2010 | CN201428392Y Gas drainage drill stem and interconnection component thereof |
| 03/24/2010 | CN201428384Y Mine pneumatic frame column type driller bracket |
| 03/24/2010 | CN201428377Y Mine pneumatic outburst-prevention driller |
| 03/24/2010 | CN201428376Y Coupling drill housing for mine pneumatic outburst-prevention driller |
| 03/17/2010 | CN201424957Y Coal bed methane-mixing intake system of ventilation air methane oxidation system |
| 03/17/2010 | CN201424956Y Drainage device of gas drainage pipeline |
| 03/17/2010 | CN201424955Y Dust-suppressing gas-diluting device with linkage of wind and water |
| 03/17/2010 | CN101672196A Method for improving amount of drained, extracted and pressure released gas in surface well drilling |
| 03/10/2010 | CN101666241A Integrated drilling-blasting-pressurizing-drawing protrusion preventing method for regional gas control |
| 03/10/2010 | CN101666240A High-pressure water jet anti-outburst permeable system for mine |
| 03/10/2010 | CN100593630C Caving zone edge inclined drill hole bushing burying method for extracting and discharging gas for goaf and adjacent layer |
| 03/03/2010 | CN201416455Y Multi-hole connecting device capable of deslagging in hole drilling during gas extraction under coal mines |
| 03/03/2010 | CN201416437Y Borehole measuring rod |
| 03/03/2010 | CN201416390Y Lift type coal mine gallery gas drill |
| 02/24/2010 | CN201412183Y Real-time monitoring and early warning device for mine gas outburst |
| 02/24/2010 | CN100591893C Projecting coal bed edge top drill construction method for eliminating pumping blind zone |
| 02/17/2010 | CN201407065Y High pressure pulsating water-injecting device for preventing coal or rock dynamic disaster |
| 02/10/2010 | CN201401191Y Air inlet and exhaust circulating system for ventilation air methane oxidation device |
| 02/10/2010 | CN101644166A Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing |
| 02/03/2010 | CN201396189Y Borehole connection device for extracting gas in coal mine |
| 02/03/2010 | CN201396186Y Mining device for removing orifice dust and gas accumulation |
| 01/27/2010 | CN201391331Y Integral in-hole drilling tool for drilling slotting punched hole of coal seam |
| 01/27/2010 | CN101634231A Method for reinforcing and sealing coal mine and preventing gas |
| 01/20/2010 | CN201386569Y Gas drainage device |
| 01/20/2010 | CN101629492A Extracting device for mine gas |
| 01/20/2010 | CN101629491A Coal mine omnipotent gas extraction agent |
| 01/13/2010 | CN201381874Y Coal bed pressure measurement gas water separation device |
| 01/13/2010 | CN201381873Y Negative pressure deslagging filtering drainage device and extracting device |
| 01/13/2010 | CN201381872Y Hole-sealing pressure measuring device |
| 01/06/2010 | CN201377810Y Automatic control system of mine ventilation coal-bed methane burner |
| 01/06/2010 | CN201377335Y Underground crawler traveling type rotary gas drilling machine |
| 12/30/2009 | CN201372808Y High negative pressure U-shaped automatic drainage device of gas drainage pipeline |
| 12/30/2009 | CN101614135A Drilling-explosion-pumping triadic gas extraction method |
| 12/30/2009 | CN101614134A Drilling-explosion-pumping triadic pressure-relief outburst-prevention method |
| 12/30/2009 | CN101614133A High pressure jet drilling and slotting integration pressure-release anti-burst method |
| 12/30/2009 | CN100575656C Full-hydraulic multifunctional driller for gas extraction, drainage and discharge |
| 12/23/2009 | CN201367915Y Coal mine gas mixing device by employing Venturi ejector |
| 12/23/2009 | CN100572748C Method and system for circulating fluid in a well system |
| 12/16/2009 | CN201363161Y Negative pressure pipe automatic drainage device |
| 12/16/2009 | CN101603431A Method for reinforcing outburst-prone coal seam cross-cut coal uncovering |
| 12/09/2009 | CN201358815Y Gas concentration flowmeter for coal-mine gas drainage |
| 12/09/2009 | CN201358810Y Straight tube type smut explosivity test device |
| 12/09/2009 | CN201358708Y Motor load and propelling force self-adaptive hydraulic drilling machine |
| 12/09/2009 | CN101598034A Method for forecasting coal and gas outburst on site |
| 12/09/2009 | CN101598033A Method for forecasting coal and gas outburst on site |
| 12/09/2009 | CN101598030A Method for realizing fast coal exposing of coal seam rock cross with outburst danger |
| 12/09/2009 | CN101598029A Ascending hole coal seam gas pressure measurement water pressure excluding instrument and method |
| 11/25/2009 | CN201351479Y Gas drainage secondary high pressure grouting hole sealing device |
| 11/25/2009 | CN101586469A Hole sealing method for deep hole advanced loose blasting |
| 11/18/2009 | CN101581233A Method for lowering concentration of mine methane |
| 11/18/2009 | CN101581232A Method and device for pre-pumping coal body gas by concussion fracture of high-pressure gas |
| 11/18/2009 | CN101581231A Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture |
| 11/18/2009 | CN101581230A High-pressure water mist generator |
| 11/18/2009 | CN100560936C Method for coal mine downhole reproduction and back production |
| 11/11/2009 | CN201344808Y Adjustable orifice plate flowmeter |
| 11/11/2009 | CN101575983A Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof. |
| 10/21/2009 | CN201330558Y Jog opening hydraulic drilling rig |
| 10/14/2009 | CN201326418Y Drill jet-hole security protection system orifice multi-passage device |
| 10/14/2009 | CN201326382Y Hydraulic outburst prevention drilling machine for coal seam gas drainage |
| 10/07/2009 | CN201321869Y Telescopic drainage hole-packer |
| 10/07/2009 | CN201320508Y Pneumatic injection device made of hole sealing materials |
| 10/07/2009 | CN100547227C Protruding set of guarding against contrary wind for gas |
| 09/30/2009 | CN201318191Y Central dewatering device for pumping drilling hole |
| 09/23/2009 | CN101539028A Method and apparatus for preventing and controlling coal or rock dynamic disaster by high-pressure pulse water injection |
| 09/23/2009 | CN101539027A Device for treating low concentration methane in ventilation air methane (VAM) of coal mine and method thereof |
| 09/23/2009 | CN101539008A Ground stereoscopic discharge and mining method of coal bed methane |
| 09/16/2009 | CN201310376Y Safety protection system for drilling and spraying orifice |
| 09/16/2009 | CN201310375Y Rope drawing and remote control opening device for extracting and mining methane gas with buried pipe on coal face |
| 09/16/2009 | CN201310374Y Flexible high-intensity connection device |
| 09/16/2009 | CN201310373Y Coal gas purifier for safety protection system for drilling and spraying orifice |
| 09/16/2009 | CN101532392A Gas drainage device |
| 09/16/2009 | CN101532391A In-hole drilling tool integrating drilling, slotting and punching coal seam and using method thereof |
| 09/02/2009 | CN201301726Y Mash gas adding system and safety protecting mechanism of coal mine air last methane oxygenizing device |
| 09/02/2009 | CN100535396C Method for extracting released-gas of protected coal-bedding under unstabilized thin coal bedding set condition |
| 09/02/2009 | CN100535395C Gridding type layer-through drilling pore group permeability-increasing gas pumping method |
| 08/26/2009 | CN201297181Y Water discharge device moved with pipe in coal mine gas extraction pipeline |
| 08/26/2009 | CN101514638A Control system for protecting coal-mine gas from explosion |
| 08/26/2009 | CN101514637A Execution system of gas tunnel outburst prevention comprehensive measures |
| 08/19/2009 | CN201292860Y Pumping drillings mash gas receiver |
| 08/19/2009 | CN201292859Y Mine ventilation air oxidation apparatus |
| 08/19/2009 | CN201292858Y Mash gas automatic blowoff |
| 08/19/2009 | CN201292857Y Emergency wind inversing apparatus for coal mine aid |
| 08/12/2009 | CN100526606C Method for extracting protruded coal-bed downward bedding long-borehole step-by-step covering area gas |
| 07/22/2009 | CN201277057Y Fully-mechanized mining caving coal working surface top coal gas drainage apparatus |
| 07/15/2009 | CN201273196Y Intelligent mining movable gas pump station |
| 07/15/2009 | CN101482027A Fast pressure-releasing coal sample room of coal and gas burst test |
| 07/15/2009 | CN101482026A Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method |
| 07/08/2009 | CN101476485A Large coal bed gas recovery apparatus set |
| 07/08/2009 | CN101476484A Automatic gas discharge apparatus |
| 07/08/2009 | CN101476483A Gas draining and utilizing method for waste mine |
| 07/08/2009 | CN101476482A Inner loudspeaker hole packer |
| 07/08/2009 | CN101476481A Anti-burst pressure release passage for tunneling surface |
| 07/08/2009 | CN100510315C Method and system for enhanced access to subterranean zone |
| 07/01/2009 | CN201265430Y Blowout prevention hole apparatus for hole drilling construction |
| 06/23/2009 | CA2589332C Method and system for accessing subterranean deposits from the surface |
| 06/17/2009 | CN101457654A Telescopic type pulling hole packer |
| 06/10/2009 | CN201255004Y Anti-extrusion honeycomb machine |