| 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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| 10/30/2013 | CN102011574B Method for increasing yield of coal bed methane through vibration |
| 10/23/2013 | CN103362549A Automatic water draining device and gas extraction system |
| 10/23/2013 | CN103362542A Sectionalized hole sealing method for bedding gas extraction drilled holes |
| 10/23/2013 | CN103362541A Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability |
| 10/23/2013 | CN103362540A High gas coal seam pressure relief gas extraction method |
| 10/23/2013 | CN103362539A Method for extracting pressure relief gas by retained roadway drill site drilling |
| 10/23/2013 | CN103362538A Pressure alternate gas exhausting method by slotting and fracturing coal seams |
| 10/23/2013 | CN103362537A Drainage mechanism of gas extraction pipe |
| 10/23/2013 | CN103362514A Speedy tunneling method for gas drainage roadway |
| 10/23/2013 | CN103362472A Externally injecting type gas drainage and coal seam water injection hole packer |
| 10/16/2013 | CN203239384U Gas emission control device |
| 10/16/2013 | CN203239383U Gas drainage pipeline explosion suppression fire retardance device |
| 10/16/2013 | CN203239239U Large-drift-diameter flat-groove circular drill rod |
| 10/16/2013 | CN103352718A Fully-sealed wind power slagging gas-drainage deep well drilling system and method |
| 10/16/2013 | CN103352717A Method for improving drawing and discharging rate of coal bed gas/coal bed methane |
| 10/16/2013 | CN103352716A 瓦斯抽采管 Gas drainage pipe |
| 10/16/2013 | CN103352682A Method for improving gas extraction rate in coal seams with pulse electromagnetic waves |
| 10/16/2013 | CN103352675A Gas extraction, drilling and sealing device and method |
| 10/09/2013 | CN203230345U Honeycomb-shaped drill stem and connecting device thereof |
| 10/09/2013 | CN103343844A Duplex-metal composite gas drainage pipeline with coating and manufacturing method thereof |
| 10/02/2013 | CN203223245U Anti-collapsing apparatus for drainage drill hole with large aperture and long distance |
| 10/02/2013 | CN203223196U Mine air water slag packing and separating device |
| 10/02/2013 | CN103334781A Monitoring system for potential safety hazard in methane gas exhausting and mining |
| 10/02/2013 | CN103334775A Gas extraction device for upper corner of coal mining working face and hydraulic bracket |
| 09/25/2013 | CN203214093U Offset W ventilation working face based on small coal pillar connection roadway |
| 09/25/2013 | CN203213997U Two-end self-blocking-type belt-pressing hole-sealing bag |
| 09/25/2013 | CN103321670A Built-in drill stem temperature control automatic wind closing flame-retardant device |
| 09/25/2013 | CN103321669A Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting |
| 09/25/2013 | CN103321575A Coal seam top/bottom plate penetrating-hole short-radius deflecting rotary drilling process |
| 09/25/2013 | CN102418549B Technical method for extracting coal bed methane from constructed coal development area |
| 09/25/2013 | CN102296979B Dedusting and dehydrating process of deep condensation to gas by utilizing natural cold source |
| 09/25/2013 | CN102242640B Rapid outburst elimination method for cross cut coal uncovering in coal mine underground |
| 09/18/2013 | CN203201588U Circular seam injecting type gas diluter |
| 09/18/2013 | CN103306717A Method for utilizing superfluous heat of ventilation air gas concentrated and subjected to counterflow oxidation |
| 09/18/2013 | CN103306716A Heat storage and oxidation system for ventilation air gas and united pre-heat starting method of heat storage and oxidation system |
| 09/18/2013 | CN103306715A Gas extraction drilling orifice device and operating method thereof |
| 09/18/2013 | CN103306714A Gas control method for triple-purpose use of drilled holes in coal floor of close distance seam group |
| 09/18/2013 | CN103306713A Networking reinforcement method for cross drilling holes of outburst coal seam |
| 09/18/2013 | CN103306712A Coal bed gas standing wave exploitation method |
| 09/18/2013 | CN103306677A Rapid rock cross-cut coal uncovering process and outburst prevention method |
| 09/18/2013 | CN103306657A Coal-seam slotting pressure-relief anti-reflection and slit groove retaining device and method |
| 09/18/2013 | CN102434191B Spiral-flow type dilution mixer with adjustable blades for gas drainage |
| 09/18/2013 | CN102121394B Method for uncovering outburst coal seam by using pseudo lithosphere on laneway |
| 09/18/2013 | CN101975075B Method for determining coal mass gas content by advancing face gas emission parametric inversion |
| 09/11/2013 | CN103291352A Mechanical spiral hole packer used for draining coal seam gas |
| 09/11/2013 | CN103291351A Mining-area distributed-type coal-mine gas extraction thermoelectric cooling poly-generation energy resource system |
| 09/11/2013 | CN103291301A Pilot-tunneling method for coal uncovering |
| 09/11/2013 | CN102352768B Gas drainage method and equipment with alternative drainage |
| 09/11/2013 | CN101726572B Gas drainage detection device and water removing device capable of automatically draining water |
| 09/04/2013 | CN203175601U Negative pressure stabilizing device for coal mine gas pumping |
| 09/04/2013 | CN203170177U Device for purifying ventilation air methane |
| 09/04/2013 | CN103277131A Gas separating device and gas separating method |
| 09/04/2013 | CN103277130A Mine area distribution type poly-generation energy supplying system with coal mine gas emission close to zero |
| 09/04/2013 | CN103277129A Technology preventing gas on upper corner of coal mining working face from exceeding limit |
| 09/04/2013 | CN102305097B Automatic water drainage slag remover in gas drainage |
| 08/28/2013 | CN203161292U Automatic water-draining device of gas drainage pipeline |
| 08/28/2013 | CN203161287U Out-flow gas collecting device for drilling construction |
| 08/28/2013 | CN203161286U Air-pressing and cooling powder-discharging device by adopting nitrogen in down holes |
| 08/28/2013 | CN203161285U Integrated automatically-controlled water drainage device of gas drainage pipeline |
| 08/28/2013 | CN203161272U High-position similar-E-shaped ventilation system for coal face |
| 08/28/2013 | CN203161161U Device for sealing holes by pressing-injecting polyurethane |
| 08/28/2013 | CN103266913A Gas extraction method |
| 08/28/2013 | CN103266907A Tunnel construction ventilation system for local gas outburst |
| 08/28/2013 | CN102251799B Method for selecting high-level gas drainage horizon in coal mine |
| 08/21/2013 | CN203146015U Ascending drilling hole orifice drainage device |
| 08/21/2013 | CN203146000U Gas drainage pipe sewage discharge device |
| 08/21/2013 | CN203145999U Emergency processing device for mine ventilation air |
| 08/21/2013 | CN203145998U Mine gas pumping and draining hole packer |
| 08/21/2013 | CN203145997U Frequency conversion fan device for extracting gas |
| 08/21/2013 | CN203145996U Downward wet hole drainage |
| 08/21/2013 | CN203145995U High-level drilling field structure for treatment of coal face gas |
| 08/21/2013 | CN203145990U Tempering preventing device |
| 08/21/2013 | CN203145871U Blowout-control hole device of coal mine |
| 08/21/2013 | CN103256072A Anti-spray device for assisting high-pressure water jet slotting |
| 08/21/2013 | CN103256067A Gas pumping and releasing pipeline explosion suppression fire retarding device |
| 08/21/2013 | CN102425446B Gas-residue separating integrated critical pumping device used for coal mine underground hole-drilling |
| 08/20/2013 | US8511372 Method and system for accessing subterranean deposits from the surface |
| 08/14/2013 | CN203130151U Automatic on-line draining device for gas drainage |
| 08/14/2013 | CN203130144U Gas collector for mining |
| 08/14/2013 | CN203130143U Automatic water discharging device of gas extraction collecting box |
| 08/14/2013 | CN203130028U Double-plugging hole packer |
| 08/14/2013 | CN101476481B Anti-burst pressure release passage for tunneling surface |
| 08/13/2013 | US8505620 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 08/07/2013 | CN203115188U Integrated bypass two-position five-way negative pressure drain valve |
| 08/07/2013 | CN203114342U Automatic water drainage device for drawing out methane under high negative pressure |
| 08/07/2013 | CN203114330U Underground gas extraction hole connecting pipe fitting |
| 08/07/2013 | CN203114329U Coal mine long-distance roadway gas discharge device |
| 08/07/2013 | CN103233768A Horizontal-drilling staged-fracturing pressure relief method for underground coal bed |
| 08/07/2013 | CN102392680B Hole-bottom straight knife slitting device |
| 08/07/2013 | CN102337918B Twin-stage adjustable blade spiral-flow type dilution mixer for gas drainage |
| 07/31/2013 | CN203098932U Adjustable extensible control valve |
| 07/31/2013 | CN203097934U Adjustable extensible four-way joint |
| 07/31/2013 | CN203097814U Fixed type air bag hole packer |
| 07/31/2013 | CN103225492A Long-distance belt pressure hole sealing method of gas extracting drill hole |
| 07/24/2013 | CN203081490U Zero resistance rotary type ventilation air methane collecting device |
| 07/24/2013 | CN203081397U Grouting bag type hole packer |
| 07/24/2013 | CN103216641A Integrated bypass 2-position and 5-way negative pressure water drain valve |
| 07/24/2013 | CN103216259A System protecting underground coal bed hole drilling from collapse |
| 07/24/2013 | CN103216258A Concentrated stripe type gas pumping and discharging method for kilometer drill machine |
| 07/24/2013 | CN103216201A Device for packing and separating mining gas-water slag |