| 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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| 05/01/2013 | CN103075180A Gas-liquid two-phase jet slotting system and method |
| 05/01/2013 | CN103075179A Entitative coal seam gas drainage drilling hole double-pipe drainage method |
| 05/01/2013 | CN103075173A High-position inclined E-type ventilation system of coal face |
| 05/01/2013 | CN102337923B Control device of concentration and pressure of gas |
| 04/25/2013 | WO2013056597A1 Gas extraction method and device with alternating extraction and injection |
| 04/24/2013 | CN202900308U Positive-pressure anti-return-air anti-return-water device |
| 04/24/2013 | CN202900307U Negative pressure return-air-proof and return-water-proof device |
| 04/24/2013 | CN202900304U Self-balance type water seal anti-explosion device |
| 04/24/2013 | CN202900144U Hole sealing device for coal bed bedding hole |
| 04/24/2013 | CN202900119U Ground extraction gas drilled well casing dredging device |
| 04/24/2013 | CN202893100U Resistance-free slag remover device |
| 04/24/2013 | CN103061807A Negative pressure automatic water drainage device used for gas pumping pipes |
| 04/24/2013 | CN103061798A Method for extracting coal bed methane through down-hole bedding long borehole consecutive cave building |
| 04/24/2013 | CN103061797A Method and device for increasing the coal mine gas drainage efficiency |
| 04/24/2013 | CN103061796A Extraction pipe, extraction system and downwards-drilling extraction method |
| 04/24/2013 | CN103061675A Super-deep hole double-tube drilling directional drilling rig |
| 04/24/2013 | CN102168575B Loose blasting gas extraction technology for horizontal branch well of coal seam floor |
| 04/24/2013 | CN102135014B Automatic draining device |
| 04/17/2013 | CN202884290U Duplex pipe for gas draining and hole sealing by grouting |
| 04/17/2013 | CN202882991U Anti-spraying gas acceptor |
| 04/17/2013 | CN202882990U Mine gas drainage pipeline slag removal device |
| 04/17/2013 | CN202882989U Coal site synthesized polyurethane foaming bag |
| 04/17/2013 | CN202882842U Hole sealing device |
| 04/17/2013 | CN202882814U Safe drilling pneumatic jet flow three-proofing device for outburst coal layer |
| 04/17/2013 | CN202882810U Novel multifunctional dust falling device |
| 04/17/2013 | CN103046959A Full negative pressure automatic water-discharging device |
| 04/17/2013 | CN103046949A Bias gas-liquid two-phase jet-flow slotting permeability-increasing device and method |
| 04/17/2013 | CN103046948A Device and method for preventing coal drilling and cutting or gas emission |
| 04/17/2013 | CN103046947A Gas extraction method by using major diameter pipeline and sealing transverses between mine goaf and tail roadway |
| 04/17/2013 | CN103046946A Low permeability coal seam gas pre-drainage method though intensive drilling holes and pipe pressure-up |
| 04/17/2013 | CN101881150B Hydraulic cutting nozzle with residue filer device |
| 04/10/2013 | CN202866892U Air pressure hole bottom draining device |
| 04/10/2013 | CN202866891U Water discharging device of gas extraction pipeline |
| 04/10/2013 | CN202866870U Gas extraction pipeline |
| 04/10/2013 | CN202866869U Portable gas drainage integrated parameter detector |
| 04/10/2013 | CN202866868U Novel dehydration and deslagging device used for mine gas extraction pipeline |
| 04/10/2013 | CN202866867U Hole packer for drawing out gas and grouting |
| 04/10/2013 | CN202866732U Hole opening plugging device and gas extraction system |
| 04/10/2013 | CN102337917B Blade swirl-type dilution mixer for gas drainage |
| 04/10/2013 | CN102155255B Safety production power generation technology by unstable gas source |
| 04/10/2013 | CN102116171B Method for rapid discharge of gas in tunnel |
| 04/03/2013 | CN202851054U Mining hole-sealing capsule |
| 04/03/2013 | CN202851053U Whole set connecting and pumping conveying device for mine gas pumping |
| 04/03/2013 | CN202851052U A delay self-expanding capsule and paste body combination hole sealing device for drilled holes of gas extraction |
| 04/03/2013 | CN202851051U Mining flame-proofing and intrinsic safety type air-reversing proofing gas automatic discharging apparatus |
| 04/03/2013 | CN202850968U Sand-adding device for coal mine underground fracturing or slotting |
| 04/03/2013 | CN103016049A Comprehensive treatment method of gas on firstly mined permian system working face |
| 04/03/2013 | CN103016048A Zero-resistance ventilation air methane collecting method and device |
| 04/03/2013 | CN103016047A Method of draining gas in gob through long drill hole in roof trend on fully mechanized caving face |
| 04/03/2013 | CN103016046A Mash gas electricity generating system |
| 04/03/2013 | CN103016045A Mining continuous quantitative secondary hole sealing system |
| 04/03/2013 | CN103016044A Comprehensive method of drilling, permeability increasing, repairing and gas-driven displacing of drill hole underground coal mine |
| 03/28/2013 | WO2012174586A3 Mining method for gassy and low permeability coal seams |
| 03/27/2013 | CN202832649U Centralized drainage and gas outburst prevention device for rig with rank of 1000 kilometers of coal mine |
| 03/27/2013 | CN202832630U Gas return prevention device of coal mine gas pipeline |
| 03/27/2013 | CN202832629U Hole sealing bag for mining |
| 03/27/2013 | CN202832628U Under-pressure gas drainage hole packer |
| 03/27/2013 | CN202832458U Deep hole coal seam spalling water injection hole sealing device |
| 03/27/2013 | CN202832457U Intelligent remote controlled underground fracturing pump set of coal mine |
| 03/27/2013 | CN202832212U Drill for gas draining hole |
| 03/27/2013 | CN202822842U Gas coal mine pump station gas-water separator |
| 03/27/2013 | CN102996160A Safety protection device and method for slotting to increase permeability by water jet |
| 03/27/2013 | CN102996159A Multiphase medium plugging device and method for gas extraction drill hole |
| 03/27/2013 | CN102996158A Coal-mine gas drainage tube and manufacturing method for same |
| 03/27/2013 | CN102996157A Water-level change warning device and coal mine gas extraction system |
| 03/27/2013 | CN102996108A Coal seam drilling coal-gas-water separating, conveying and containing device |
| 03/27/2013 | CN102261261B Drilling and reflection reducing integrated device for tectonic coal development area |
| 03/27/2013 | CN102230363B Device and method for drilling and forming hole in coal rock in structural belt |
| 03/27/2013 | CN101915119B Method for preventing gas explosion of driving face in coal mine |
| 03/20/2013 | CN202810934U Slag removing device and water discharge device |
| 03/20/2013 | CN202810933U Downward drilling drainage system |
| 03/20/2013 | CN202810930U Water drain apparatus |
| 03/20/2013 | CN202810905U Coupling device of gas extraction system and gas extraction system |
| 03/20/2013 | CN202810904U Slag removal device |
| 03/20/2013 | CN202810903U Protective device for gas pumping pipeline |
| 03/20/2013 | CN202810902U Coal mine pumping and discharging negative pressure dust extraction unit |
| 03/20/2013 | CN202810901U Gas using and emptying device in gas drainage station |
| 03/20/2013 | CN202810900U Methane gas mixer with wide concentration range |
| 03/20/2013 | CN202810780U Gas sucking and exhausting hole sleeve with baseboard capable of being dismantled |
| 03/20/2013 | CN202810766U Hole packer |
| 03/20/2013 | CN202810726U Triangular drill rod dust extractor |
| 03/20/2013 | CN202803173U Static gas mixing device |
| 03/20/2013 | CN102979575A Mine discharging device |
| 03/20/2013 | CN102979573A Mine drainage device |
| 03/20/2013 | CN102094670B Method for replacing mine goaf gas with carbon dioxide |
| 03/20/2013 | CN101858228B Continuous prediction method of gas emission dynamic characteristic outburst of tunneling surface |
| 03/13/2013 | CN202791016U Novel pipe connection device for gas extraction pipes |
| 03/13/2013 | CN202788935U Drainage pipeline negative pressure automatic drainer |
| 03/13/2013 | CN202788933U Negative pressure automatic water releaser |
| 03/13/2013 | CN202788919U Mine drilling and cutting integrated outburst prevention and permeability increasing system |
| 03/13/2013 | CN202788918U Coal mine extraction system gas intelligent control device |
| 03/13/2013 | CN202788791U Hydropower spin cutting head |
| 03/13/2013 | CN202788619U Integral drill bit for drilling and cutting |
| 03/13/2013 | CN102966372A Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| 03/13/2013 | CN102966371A Drainage borehole plugging device and method |
| 03/13/2013 | CN102966370A Drainage borehole plugging device and method |
| 03/13/2013 | CN102966310A Induced flow device and method for water jet kerf in drilled hole |
| 03/06/2013 | CN202768055U Gas extraction system for high gas coal mine |
| 03/06/2013 | CN202768054U Anti-gas-overrun device for discharge port of kilometer-type driller |
| 03/06/2013 | CN202767895U Lifting device used for deep drill rig |