| 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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| 08/02/2001 | US20010010432 Method and system for accessing subterranean deposits from the surface |
| 01/04/2001 | WO2000031376A3 Method and system for accessing subterranean deposits from the surface |
| 06/02/2000 | WO2000031376A2 Method and system for accessing subterranean deposits from the surface |
| 06/02/2000 | CA2792184A1 Method and system for accessing subterranean deposits from the surface |
| 02/15/2000 | US6024171 Method for stimulating a wellbore penetrating a solid carbonaceous subterranean formation |
| 12/29/1999 | EP0772665B1 Method of enriching the methane content of a mine gas |
| 12/07/1999 | US5997100 Inertization system for highwall mining |
| 10/20/1999 | CN2344545Y Gas explosion-proofing device |
| 09/29/1999 | CN2340900Y Quincunx anti-explosive vent |
| 02/17/1999 | CN2307909Y Gas blowoff apparatus |
| 01/06/1999 | CN1204378A Fluid drilling system |
| 12/09/1998 | CN2299941Y Gas automatic drawing-off monitor |
| 11/04/1998 | CN2296401Y Negative pressure dust trapping device for coal discharge outlet of discharge top coal hydraulic support |
| 10/13/1998 | US5820223 Inertization system for highwall mining |
| 03/11/1998 | CN2276079Y Step drilling tool with three or four wing |
| 12/11/1997 | WO1997046786A1 A drilling apparatus and method |
| 06/19/1997 | WO1997021900A1 Fluid drilling system |
| 05/14/1997 | EP0772665A1 Method of enriching the methane content of a mine gas |
| 12/04/1996 | CN2241775Y Automatic discharging device for draw-off pipeline |
| 11/13/1996 | CN1135783A Highwall mining system |
| 05/01/1996 | CN2226145Y Dual-purpose working machine for extracting coal bed gas and repairing shaft |
| 02/01/1996 | WO1996002614A1 Method of enriching the methane content of a mine gas |
| 01/25/1996 | DE4425712A1 Verfahren zur Anreicherung des Methangehaltes eines Grubengases Method for enriching the methane content of mine gas |
| 01/10/1996 | CN2217104Y Device for treating gas in cool mine |
| 09/06/1995 | CN1107930A Air purifier for coal mine |
| 03/29/1995 | CN2193428Y Aerated capsule hole sealing device for mine gas ventilation |
| 01/26/1995 | WO1995002747A1 Highwall mining system |
| 11/16/1994 | CN2182881Y Device for automatic wetting and spaying gas fire |
| 12/22/1993 | CN2150336Y Automatic controlling device of wind-electricity locking for monitoring gas |
| 11/24/1993 | CN2147353Y Monitoring device for gas pump station |
| 07/20/1993 | US5229017 Method of enhancing methane production from coal seams by dewatering |
| 10/21/1992 | CN1018751B Self-controlled gas-removing method and apparatus |
| 06/17/1992 | CN1062018A Mine gas exhauster with pneumatic drawing |
| 12/17/1991 | US5072990 Acceleration of hydrocarbon gas production from coal beds |
| 09/04/1991 | EP0444760A1 Enhanced methane production from coal seams by dewatering |
| 09/02/1991 | CA2037454A1 Method of enhancing methane production from coal seams by dewatering |
| 08/07/1991 | CN1053657A Self-controlled gas-removing method and apparatus |
| 07/17/1991 | CN1053103A Simplified collection method for shoft coal gas |
| 12/18/1990 | US4978172 Gob methane drainage system |
| 09/20/1990 | DE3909058A1 Dry-drilling extraction system |
| 07/19/1990 | DE3901197A1 Water separator for fire-damp lines |
| 03/21/1990 | CN2054850U Water wheels fan |
| 06/06/1989 | US4836611 Method and apparatus for drilling and separating |
| 09/01/1988 | DE3705236A1 Methane suck-off pipe for gas boreholes in underground mining |
| 03/24/1988 | DE3629220A1 Methane-drainage pipe for gas-drainage boreholes in underground working, with casing by socket pipes |
| 10/13/1987 | CA1228024A1 Multiple level methane drainage method |
| 08/18/1987 | US4687060 Production and grout liner for methane drainage in subterranean boreholes and method |
| 05/27/1987 | DE3544776C1 Drill carriage with rotatable bracing column |
| 03/24/1987 | US4651836 Process for recovering methane gas from subterranean coalseams |
| 11/25/1986 | US4624328 In-shaft drilling apparatus for recovery of gas from subterranean formations |
| 09/16/1986 | US4611855 Method for collecting gas from subterranean formations |
| 07/15/1986 | US4600061 In-shaft drilling method for recovery of gas from subterranean formations |
| 10/01/1985 | US4544208 Degasification of coal |
| 09/10/1985 | CA1193184A1 Multiple level methane drainage shaft system |
| 10/02/1984 | US4474409 Method of enhancing the removal of methane gas and associated fluids from mine boreholes |
| 09/18/1984 | US4471840 Method of coal degasification |
| 06/05/1984 | US4452489 Multiple level methane drainage shaft method |
| 07/05/1983 | US4391327 Solvent foam stimulation of coal degasification well |
| 03/29/1983 | US4378132 Mining method and apparatus |
| 03/22/1983 | CA1143399A1 Pressure seal for pumping instruments through drill rod |
| 02/01/1983 | CA1140457A1 Method for recovering methane from coal seams |
| 12/22/1982 | EP0067427A2 Gas suction method in coal mining, and suction pipe to perform this method |
| 03/30/1982 | US4321967 Suction of gases from boreholes in coal mining |
| 03/23/1982 | US4320627 Apparatus for recovering natural gas in a mine |
| 12/15/1981 | US4305464 Via borehole under triaxial compression |
| 12/01/1981 | US4303274 Degasification of coal seams |
| 11/17/1981 | US4300631 Flexible continuous grout filled packer for use with a water infusion system |
| 11/10/1981 | US4299295 Process for degasification of subterranean mineral deposits |
| 10/20/1981 | US4295536 Pressure seal for pumping instruments through drill rod |
| 08/11/1981 | US4283089 Injecting material capable of swelling coal |
| 06/16/1981 | US4273193 Process for use in degasification of subterranean mineral deposits |
| 06/09/1981 | US4271676 Method and apparatus for recovering natural gas in a mine |
| 04/29/1981 | EP0027678A1 Method for recovering methane from coal seams |
| 03/03/1981 | US4253703 Method for mining coal using ammonia and nitrifying bacteria |
| 01/20/1981 | US4245699 Method for in-situ recovery of methane from deeply buried coal seams |
| 10/14/1980 | CA1087518A1 Gas withdrawal from an in situ oil shale retort |
| 03/11/1980 | US4193105 Pipe with an external sealing body |
| 07/11/1979 | EP0002877A2 Method for the removal of methane |
| 06/05/1979 | US4157204 Face ventilation system for coal mines |
| 02/20/1979 | US4140343 Gas withdrawal from an in situ oil shale retort |
| 08/22/1978 | US4108256 Sliding stabilizer assembly |
| 04/18/1978 | US4084855 Water-driven air pumping and dust-suppressing apparatus |
| 04/04/1978 | US4082323 Box hole drill steel |
| 01/03/1978 | US4065927 Method for blocking gas flow in a coal seam |
| 08/23/1977 | US4043395 Method for removing methane from coal |
| 05/18/1976 | US3957311 Scraper chain conveyor with ventilation parts |
| 01/27/1976 | US3934649 Method for removal of methane from coalbeds |