| 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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| 03/19/2008 | CN201037427Y Extrusive danger coal bed safety guide spraying drilling device |
| 03/19/2008 | CN201037402Y Goaf decompression coal bed gas extracting simulation experiment device |
| 03/19/2008 | CN101144389A Gridding type layer-through drilling pore group permeability-increasing gas pumping method |
| 03/13/2008 | US20080060807 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060806 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060805 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060804 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060800 Method and system for accessing subterranean deposits from the surface |
| 03/13/2008 | US20080060799 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060571 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/12/2008 | CN101139933A Mining gas discharging multi-parameter measuring instrument having negative pressure compensating function |
| 03/05/2008 | CN201031711Y device for decomposing mash gas |
| 02/27/2008 | CN201027546Y Mining-used mobile gas variable pumping station |
| 02/27/2008 | CN101131091A Down-hole coal bed air-pressing helix drilling tools and drilling method using the same |
| 02/26/2008 | CA2340506C Method and system for mining hydrocarbon-containing materials |
| 02/13/2008 | CN101122296A Mining energy-saving ventilating fan |
| 02/13/2008 | CN101122239A Coalbed drilling hole inside directional dissevering method |
| 02/13/2008 | CN101122238A Drilling hole inside directional dissevering method |
| 02/13/2008 | CN101122236A Gas coal separation apparatus employed in projected coalbed burst-proof system for safe drilling |
| 02/13/2008 | CN101122222A Down-hole horizontal hole exploitation system for mixing gas displacing coal gas, and the method |
| 02/13/2008 | CN101122217A Down-hole pump drainage laneway exploitation system for mixing gas dispelling coal gas, and the method |
| 02/06/2008 | CN101117894A Fully mechanized coal face high suction tunnel lower-returning drilling primary mining gas drainage method |
| 02/06/2008 | CN101117893A Coal bed gas drainage method and device |
| 02/06/2008 | CN101117892A Coal mine gas detecting and draught fan automatic control system |
| 02/06/2008 | CN101117891A Coal mine gas detecting and draught fan automatic control device |
| 01/30/2008 | CN201013402Y Special gas pumping pipe for coal mine |
| 01/30/2008 | CN201013228Y Fully-hydraulic gas drainage multi-use drill |
| 01/23/2008 | CN100363592C Method for preventing mine lane gas from explosion and device for realizing said method |
| 01/02/2008 | CN200999628Y Draft tube used for draining drill mash gas |
| 01/02/2008 | CN200999627Y Adjustable sleeve joint |
| 12/26/2007 | EP1619352A9 Method and system for accessing subterranean deposits from the surface |
| 12/26/2007 | CN101092880A Protrudent set of guarding against contrary wind for gas |
| 12/19/2007 | CN101089368A Detection method for deep of gas exhaust hole |
| 12/19/2007 | CN100356037C Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| 12/19/2007 | CN100356036C Method for pumping out gas from mining coal layer roof |
| 12/12/2007 | CN200989213Y Pressure injection polyurethane hole sealing pump |
| 12/12/2007 | CN200989180Y Hole sealing device |
| 12/12/2007 | CN200989168Y Gas pumping and discharging driller drilling azimuth on-line regulator |
| 12/12/2007 | CN101086211A Automatic slag-discharging water draining device |
| 12/05/2007 | CN200985740Y Auxiliary handling device of mash gas pumping and discharged drill |
| 12/05/2007 | CN101082283A Gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining method |
| 10/24/2007 | CN100344857C Method of simplified advance wall type coal mining, gas collection and drainage |
| 10/17/2007 | CN101054904A Method for preventing and treating coal mine gas and coal dust explosion |
| 10/10/2007 | CN101050696A Bag type paste injection hole sealing device and its hole sealing method |
| 10/04/2007 | WO2007110562A1 Method of fracturing a coalbed gas reservoir |
| 10/04/2007 | CA2646698A1 Method of fracturing a coalbed gas reservoir |
| 10/03/2007 | CN200955352Y Gas-exhaust drill power-head on-line adjustable guide supporting device |
| 10/03/2007 | CN200955351Y Gas exhausting drill auxiliary turning-about device |
| 09/26/2007 | CN200952364Y Whole hydraulic spider for gas drainage drilling machine |
| 09/26/2007 | CN200952363Y Hydraulic clamp for gas drainage drilling machine |
| 09/26/2007 | CN200952351Y Gas drainage driller self-moving device |
| 09/26/2007 | CN200952350Y Gas drainage driller unit head adjustable guiding supporting device |
| 09/26/2007 | CN200952349Y Gas drilling machine dismounting and displacing auxiliary device |
| 09/19/2007 | CN200949476Y Gas exhausting drilling deslagging duster removing apparatus |
| 09/19/2007 | CN200949475Y Gas exhausting automatic water discharging device |
| 09/05/2007 | CN200943508Y Device for drawing gas |
| 09/05/2007 | CN101029577A Method for extracting released-gas of protected coal-bedding under unstabilized thin coal bedding set condition |
| 09/05/2007 | CN101029576A Method and apparatus for protruding hazadous coal-bed safety guide-jet drilling |
| 09/05/2007 | CN101029575A Method for extracting protruded coal-bed downward bedding long-borehole step-by-step covering area gas |
| 09/05/2007 | CN101029574A Long standpipe gas extraction in worked-out section |
| 09/04/2007 | US7264048 Slot cavity |
| 08/29/2007 | CN101025085A Method for coal mine downhole reproduction and back production |
| 08/22/2007 | CN2937483Y Nagative pressure water discharge residual extraction equipment |
| 08/15/2007 | CN2934582Y Coal mine methane detection and automatic fan control device |
| 08/15/2007 | CN101016836A Method and system for accessing subterranean deposits from the surface and tools therefor |
| 08/08/2007 | CN1330844C Drill head steering controll method |
| 08/08/2007 | CN101012756A Method for increasing gas exhaustion of coal mine bed by hole drilling |
| 08/08/2007 | CN101012755A Equipment for increasing gas exhaustion of coal mine bed by hole drilling |
| 07/24/2007 | CA2483023C Method and system for accessing subterranean deposits from the surface |
| 07/18/2007 | CN100999997A Method for drawing-out near layer gas of top-coal caving face |
| 06/20/2007 | CN2913612Y Well bore enclosed type coal bed air extraction well |
| 06/20/2007 | CN1982652A Method for eliminating gas explosion at longwall face of coal mine |
| 05/23/2007 | CN2903390Y Independent gas exhausting mine with wheel arm shape coal hole set |
| 05/23/2007 | CN1317483C Method of entering target geologic body and system |
| 05/02/2007 | CN1313702C Gas pressure relief method of ground drilling extraction minery and goaf |
| 04/25/2007 | CN2893155Y Plastic pipe for drawing-off gas |
| 04/25/2007 | CN2893154Y Movable gas drawing-off pump station |
| 04/25/2007 | CN2893152Y Large-bore hollow structural wall winding piping for ventilating/gas drowing-off |
| 04/04/2007 | CN2886083Y Ventilated gas pumping-drainage pipe with hollow structure wall |
| 03/28/2007 | CN2883673Y Adjustable gas sucking and discharging fast hole sealer |
| 03/27/2007 | US7195082 Drill head steering |
| 03/21/2007 | CN2881102Y Combined device for explosion-proof, dust proof and use of coal mine gas |
| 03/14/2007 | CN2878678Y Independent gas pumping well with wheel frame like coal hole arrangement |
| 03/07/2007 | CN1924295A Gas extraction device |
| 03/07/2007 | CN1924286A Hydraulic gripper for gas extraction, drainage and discharge driller |
| 03/07/2007 | CN1924282A Assembly and disassembly of gas extraction, drainage and discharge driller and displacement auxiliary device thereof |
| 03/07/2007 | CN1924281A Full-hydraulic multifunctional driller for gas extraction, drainage and discharge |
| 02/21/2007 | CN2871850Y Independent water-sealed gas extracting area in mine |
| 02/07/2007 | CN2866826Y Gas drawing-off device |
| 02/07/2007 | CN2866825Y Mining gas drawing-off monitoring device |
| 01/03/2007 | CN1888390A High gas yoke thick coal seam quasi-large-scale mining and high comprehensive mining low-level caving technique |
| 11/29/2006 | CN1869403A Safety coal mining and gas production method with separated air way |
| 11/08/2006 | CN2835563Y Gas filter |
| 10/18/2006 | EP1711684A1 Method for extracting a mine gas in areas which are not directly influenced by mining |
| 10/18/2006 | CN1847619A Coal mine gas pumping apparatus |
| 10/18/2006 | CN1846838A Coal mine gas burning and purifying treatment machine |
| 08/16/2006 | CN2806769Y Coal-bed gas recovery system |
| 08/16/2006 | CN2806767Y Intelligent partial ventilating system for mine |
| 08/16/2006 | CN1818343A Instant self-adaptive ventilating draining method and rotating system for preventing gas permeable mineral accident |
| 08/02/2006 | CN1811132A Comprehensive coal mine gas treating method |