| 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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| 03/16/2011 | CN201763393U Full-automatic overflow device of a methane gas extracting high drilling-yard drilling-hole |
| 03/16/2011 | CN201763392U Gas pipeline discharging device |
| 03/16/2011 | CN201763377U Gas and water extraction device and system |
| 03/16/2011 | CN201763376U Gas flow reversing mechanism of vertical-type coal mine ventilation air methane oxidation device |
| 03/16/2011 | CN201763375U Device for mixing coal mine drained methane and ventilation air methane |
| 03/16/2011 | CN201763374U Layout device of meter signal circuit |
| 03/16/2011 | CN201763373U Test simulator researching goaf gas migration under different vitalization conditions |
| 03/16/2011 | CN201763368U Dust removal box for underground boring construction |
| 03/16/2011 | CN101985888A Method for draining gas of highly gassy coal mine |
| 03/09/2011 | CN201757656U Mining mass flow sensor |
| 03/09/2011 | CN201756979U Coal mine ventilation air gas oxidation device |
| 03/02/2011 | CN201753613U Collector used for outburst prevention |
| 03/02/2011 | CN201753612U Mine ventilation air contranatant oxidation device with smoke pumping device |
| 02/23/2011 | CN201751536U Metal framework drainage apparatus suitable for high mash gas coal seam |
| 02/23/2011 | CN101979835A Method for preventing coal and gas burst by drill communicated coal mining exhaust |
| 02/16/2011 | CN201747399U Pipeline hydraulic drainage device |
| 02/16/2011 | CN201747398U Continuous negative pressure automatic water drainage device |
| 02/16/2011 | CN101975285A Five-way plastic valve for drilling hole during gas extraction, and installation and use method thereof |
| 02/16/2011 | CN101975086A Full-automatic overflow device for gas extraction by drill holes in high-positioned drill site |
| 02/16/2011 | CN101975078A Gas extraction drilling coupling device and installation and use method thereof |
| 02/16/2011 | CN101975077A High-outburst coal mine coal roadway drilling-loading-bolting integrated machine |
| 02/16/2011 | CN101975076A Structure for preventing coal and gas outburst and method for preventing outburst |
| 02/16/2011 | CN101975075A Method for determining coal mass gas content by advancing face gas emission parametric inversion |
| 02/16/2011 | CN101975054A High-pressure hydraulic cutting machine for cutting coal seams |
| 02/16/2011 | CN101975023A Method and device for drilling deep and long gas drainage hole in soft coal seam along layers |
| 02/16/2011 | CN101413399B Drill hole spray safety protection system |
| 02/09/2011 | CN201738954U Device for monitoring gas consistency in coal mines |
| 02/09/2011 | CN201738948U Coal mine gas explosion proof pipe and coal mine gas explosion proof pipe assembly |
| 02/09/2011 | CN201738947U Excavating working face high-concentration gas drainage device |
| 02/02/2011 | CN101963070A Drain device for mine gas extraction system |
| 02/02/2011 | CN101963066A Method for drawing out methane from bedding plane of coal seam by hydraulic fracturing |
| 02/02/2011 | CN101963064A Explosion proof box rubber cover |
| 02/02/2011 | CN101963043A Positive pressure jet spiral sampling drill |
| 01/26/2011 | CN201723246U Ventilating structure for pumping and exhausting gas at coal face |
| 01/26/2011 | CN201723245U Liquid injection type hole plugging device in gas drainage |
| 01/26/2011 | CN201723244U Limited-pressure inflation gun for gas drainage plugging |
| 01/26/2011 | CN201723243U Disposable infusion set for gas drainage grouting equipment |
| 01/26/2011 | CN201723222U Gas-drainage drilling sampling device |
| 01/26/2011 | CN201723201U Perforated pipe for coal mine |
| 01/26/2011 | CN201723200U Pneumatic stirring and slurry conveying all-in-one machine for draining gas |
| 01/26/2011 | CN201723195U Fool-type gas drainage hole sealing device |
| 01/26/2011 | CN101956546A Method for improving crossing-hole gas extraction concentration |
| 01/26/2011 | CN101781989B High-gas mine crossheading echelon short-drainage rapid tunneling process |
| 01/26/2011 | CN101476485B Large coal bed gas recovery apparatus set |
| 01/26/2011 | CN101476484B Automatic gas discharge apparatus |
| 01/19/2011 | CN201715164U Replaceable bypass pipe fitting of downhole gas extraction pipe |
| 01/19/2011 | CN201714337U Hole sealing device |
| 01/19/2011 | CN201714332U Drilling gas spraying-preventing system |
| 01/19/2011 | CN101949300A Inflation method for treating gas and other harmful gases produced during coal mining production process |
| 01/19/2011 | CN101949299A Instrument signal circuit arrangement device |
| 01/19/2011 | CN101482026B Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method |
| 01/12/2011 | CN201705387U Hole drilling and sealing device for coal seam gas extraction |
| 01/12/2011 | CN201705386U Self-luminescent pipeline for coal mine |
| 01/12/2011 | CN201705385U Methane gas diluter |
| 01/12/2011 | CN201705214U Multi-arris hot-melt coating wearable drilling rod |
| 01/05/2011 | CN201696090U Automatic drainer for pumping gas in coal mine |
| 01/05/2011 | CN201696080U Deslagging water drainage device of gas drainage pipeline |
| 01/05/2011 | CN201696079U High-efficiency energy-saving automatic mine gas emission system |
| 01/05/2011 | CN201696078U Dedusting and dewatering system adopting natural cold source to deeply condense gas |
| 01/05/2011 | CN201696074U Coal vertical shaft tunneling working surface double-fan double-power ventilation system |
| 01/05/2011 | CN201695957U Drill rod |
| 01/05/2011 | CN101936179A Air extracting and heating coal mine ventilating gas thermal oxidizer unit |
| 01/05/2011 | CN101936178A Mixer of coal mine extracted gas and ventilation gas |
| 12/29/2010 | CN201687523U Gas pump termination automatic alarm device |
| 12/29/2010 | CN201687519U Centralized rapid drainage device for downward drainage drilled holes |
| 12/29/2010 | CN201687513U Underground borehole hydraulic fracturing system |
| 12/29/2010 | CN201687512U Forced air grouting device |
| 12/29/2010 | CN201687511U Wall-protecting shock tube of extraction drill hole |
| 12/29/2010 | CN201687402U Spiral gas drainage drill pipe with circular-arc ribs |
| 12/29/2010 | CN101514637B Execution system of gas tunnel outburst prevention comprehensive measures |
| 12/22/2010 | CN201679454U Two-way drilling plug-type drill pipe |
| 12/22/2010 | CN101922309A Method for preventing mine gas from exploding and implementation device thereof |
| 12/22/2010 | CN101029574B Long standpipe gas extraction in worked-out section |
| 12/15/2010 | CN201671653U Rubber bladder sealing device |
| 12/15/2010 | CN101915411A Steam-water circulation system of coal mine ventilation air methane oxidation device |
| 12/15/2010 | CN101915119A Method for preventing gas explosion of driving face in coal mine |
| 12/15/2010 | CN101915118A Method for progressive gas drainage in high gas medium-hard coal seam |
| 12/15/2010 | CN101915117A Coal mine methane gas oxidation device |
| 12/15/2010 | CN101915115A Protective device for mine drilling construction |
| 12/15/2010 | CN101915098A Method for preventing and controlling rock burst through hydraulic cutting |
| 12/15/2010 | CN101915086A Coal mine underground gas borehole fracturing method |
| 12/15/2010 | CN101915085A Low-air-permeability coal-bed gas extraction method |
| 12/15/2010 | CN101915084A Process for pumping and exploiting coal bed gas by together using ground well drilling and underground hole drilling |
| 12/15/2010 | CN101915083A Method for extracting coalbed gases from coal mines by upper and lower combination |
| 12/15/2010 | CN101413398B Heating start-up system of mine ventilation air methane oxidized apparatus |
| 12/15/2010 | CN101206027B Method for steady operation of low concentration firedamp gas switching catalytic reaction |
| 12/08/2010 | CN101906993A Method and device for early warning explosion of gas and other combustible gases |
| 12/08/2010 | CN101906989A Gas decomposition eliminating liquid and coal mine gas control method |
| 12/08/2010 | CN101906988A Remote-control underground gas extraction drilling machine |
| 12/08/2010 | CN101906986A Method for distributing intake airflow and exhaust airflow of coal mine methane device |
| 12/01/2010 | CN201661244U Full hydraulic pressure multi-functional well head device |
| 12/01/2010 | CN101900488A Furnace liner for vertical coal mine ventilation air methane oxidation device |
| 11/24/2010 | CN201651386U Underground gas extraction terminal pipe control valve for coal mines |
| 11/24/2010 | CN201650344U Plastic expanding shell anchor bar for gas drainage |
| 11/24/2010 | CN201650343U Low-density methane gas mixture conveying system for methane gas oxidation device |
| 11/24/2010 | CN201650110U Novel outburst prevention drilling and loading machine |
| 11/24/2010 | CN101892842A Method for uncovering coal in vertical shaft |
| 11/17/2010 | CN201635762U Automatic water drainage device for coal mine gas extraction pipe |
| 11/17/2010 | CN201635761U Anti-outburst drilling row device |
| 11/17/2010 | CN201635650U Multi-angle coal rock drilling machine |