| Patents for E21F 17 - Methods or devices for use in mines or tunnels, not covered elsewhere (4,758) |
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| 04/29/1993 | CA2121373A1 Support device for services |
| 04/13/1993 | USRE34220 Contractible mine stopping and contractible block member for use therein |
| 04/08/1993 | DE4132990A1 Suspension fitting for attachment to rails - is located onto underside of rail with two pairs on steps in sheet metal on plane section of fitting |
| 04/08/1993 | DE4132749A1 Measuring appts. of sudden changes in vertical strain in pillars, esp. for monitoring tectonic weak zones in ground over hollow underground chambers - contains conventional inclination meters and vertical strain sensors used in conjunction with horizontal calibration bolts |
| 03/18/1993 | DE4130820A1 Mining equipment suspension chain anchorage - has roof plate with two hooked suspension arms, undercut to clear chain link inserted between them |
| 02/23/1993 | US5188186 Barricade for isolating open areas from spreading fire or smoke |
| 02/04/1993 | DE4125343A1 Mixing reactive components for consolidation of underground rock - using system which discharges them from drums using filtered and dried compressed air so that they only meet at final output pump |
| 01/26/1993 | US5181934 Method for automatically adjusting the cutting drum position of a resource cutting machine |
| 12/30/1992 | EP0519923A1 Modular services support system |
| 12/24/1992 | DE4120470A1 Clasp for securing suspension chain of overhead rails in mining supports - has holes in each end and recessed upper surface with open latched hook underneath |
| 12/16/1992 | CN2125000U Smoke alarm system-smoke sensor explosion-proof safety device for mine usage |
| 12/01/1992 | US5167474 Form for making a permanent concrete mine stopping |
| 10/22/1992 | DE3448347C2 Mine support channel section suspension |
| 10/14/1992 | CN2118818U Anti-explosive reactive in-situ compensater for mine |
| 10/01/1992 | DE4109923A1 Carrying claw for supports in mine - has hooked profiled jaws whose pivoted ends have raised surfaces in contact with nut and bolt head |
| 09/24/1992 | DE4109505A1 Hanging bracket for suspending mono rail in mine - consists of deformed rectangular plate with two sides bent down at right angles, with centre piece forming profiled traverse |
| 09/23/1992 | CN2116783U Explosion protection alertor for mining |
| 09/17/1992 | DE4122294C1 Evaluating test drill results in coal seams - uses different types of coal as base for evaluation |
| 09/15/1992 | US5147147 Water miscible liquid is added to sump, and then the mixture formed in this way is extracted from the cavity |
| 08/26/1992 | EP0425524B1 A self-calibrating electronic pressure transducer for lined tunnels |
| 08/13/1992 | DE4104383A1 Salt-mine preservation method - uses solids of compression strength greater than rock pressure and gas cushion, greatly reduces risk of roof cracking |
| 08/12/1992 | EP0498786A2 Method for limiting subsidence during the excavation of underground cavities |
| 07/29/1992 | CN2111366U Wave and smoke control alarm two-purpose machine for dust-proof and fire fighting |
| 07/23/1992 | DE4101476A1 Steel profiled support member used in mining gallery - has stirrup shaped cross=section and is laid end on end with lapped ends |
| 07/07/1992 | CA1304785C Long range multiple point wireless control and monitoring system |
| 06/23/1992 | US5123709 Hydraulic aligner device for flexible continuous tram mining machine |
| 06/16/1992 | US5121971 Method of measuring uncut coal rib thickness in a mine |
| 06/10/1992 | CN1061830A Mine emergency communication cable and method for use |
| 06/02/1992 | CA1302099C Head seal for a mine stopping |
| 02/25/1992 | US5090775 Method of monitoring and controlling mining operations |
| 02/19/1992 | CN2096645U Language signal device for mining |
| 02/12/1992 | CN2095940U Helmet methane alarm and detector |
| 02/11/1992 | US5087099 Long range multiple point wireless control and monitoring system |
| 01/09/1992 | DE4021269A1 Automatic monitor for coalface conveyor-belt position - uses metallic-banded optical cable along conveyor to reveal bend positions and angles |
| 12/11/1991 | CN2090421U Communication signaler for man car in stope mine |
| 12/04/1991 | CN2089981U Multifunction flue-gas alarm device of mine's lamp |
| 11/27/1991 | CN2089528U Ground sound monitor for mine |
| 11/13/1991 | CN2088602U Head light type gas alarm |
| 11/07/1991 | DE4014084A1 Suspending loads on channel profiles - involves two hook-head screws and connectable traverse |
| 10/10/1991 | DE4012213C1 Support claw for mine support profiles - has each hook tip extension positively coupled to support profile, and dished hook shaft profile |
| 09/25/1991 | CN2085418U Aerocyst type protecting door for coal mine |
| 08/01/1991 | DE3940834C1 Machine safety monitor preventing unwanted running - has two different frequency generators at separate ends of safety current circuit controlling power relays |
| 07/30/1991 | US5035060 Method of mapping underground mines |
| 07/17/1991 | CN1053104A Safe coal mining process without ventilation in mine |
| 06/19/1991 | CN2079218U Multi-function instrument for mine construction |
| 06/05/1991 | CN2078375U Multi-point displacement meter for drilling in rock and soil |
| 06/05/1991 | CN2078374U Alarm for remote-detecting smog in underground mining pit |
| 05/16/1991 | WO1991006799A1 Modular services support system |
| 05/16/1991 | WO1991006746A1 A method of sealing an opening |
| 05/15/1991 | CN2077096U Mine combined hot-blast stove |
| 05/15/1991 | CN2077027U Head plate monitoring alarm treating device |
| 05/15/1991 | CN2077026U Slope tunnel deadlock safety device for vehicle and man |
| 05/08/1991 | EP0425524A1 A self-calibrating electronic pressure transducer for lined tunnels. |
| 05/08/1991 | DE3941097C1 Cable channel or tray support - has coupling element fixable from above in form of shaft fitting selectable slots and with projection to act like hook |
| 04/30/1991 | US5011433 Multipole connector for control devices in underground working |
| 04/18/1991 | DE3933634A1 Power supply controller for loader and drill wagon - implements sequential switching of circuits for monitoring different machine functions independently using single power supply cable |
| 04/10/1991 | EP0421068A1 Method for removing water-retensive liquids from a subterranean hollow space |
| 04/04/1991 | DE3932053A1 Measuring escarpment movement using measuring probe - introduced through guide pipe inserted into ground and accepting target disc and light beam |
| 04/03/1991 | CN2074365U Safety speech alarm for preventing explosion in mines |
| 03/13/1991 | CN2073032U Safety protecting unit for mine hydraulic coupler |
| 02/28/1991 | DE3939151C1 Load hanger for mine - has support claws with headed bolts for support profile |
| 02/21/1991 | DE3927905C1 Natural gas storage in salt cavern - involves introduction of methanol to prevent condensation and ice formation |
| 01/22/1991 | US4986696 Method of dewatering a subterranean space, especially a mine |
| 11/10/1990 | CA2053847A1 Inside processing apparatus |
| 11/09/1990 | CA2016296A1 Inside processing apparatus |
| 11/07/1990 | CN2065240U Coal-partitioning acoustooptic alarm for coal mine |
| 11/06/1990 | US4968978 Long range multiple point wireless control and monitoring system |
| 09/26/1990 | CN2062763U Pocket-size multifunctional alarm for combustible gas |
| 09/25/1990 | US4958796 Coupling or connector for securing a load-bearing support to a head of a bolt |
| 08/08/1990 | CN1044514A Alarm device for surrounding rock collapse |
| 07/05/1990 | DE3909860C1 Working frame for grouting pumps used in underground operation |
| 06/06/1990 | CN1008290B Method and installation for preventing main sector of mine shaft from being destroyed by explosive wave |
| 05/16/1990 | CN2057216U Gas alarm mounted on miner's lamp |
| 05/16/1990 | CN1042214A Long range multiple point wireless control and monitoring system |
| 05/02/1990 | CN2056699U Hanging device for explosion isolation camp |
| 04/11/1990 | CN1007536B Overspeed signal generating device for bogie |
| 04/10/1990 | US4915540 Contractible mine stopping and contractible block member for use therein |
| 04/03/1990 | US4913499 Equipment and method for measuring convergence |
| 03/28/1990 | CN2055226U Gas alarm for miner's lamp |
| 03/21/1990 | CN2054829U Detecting alarm instrument for mine crush |
| 03/21/1990 | CN2054828U Electronic complex controller used in underground coal mining district |
| 03/06/1990 | US4906132 for sealing an underground passage |
| 02/08/1990 | WO1990001139A1 A self-calibrating electronic pressure transducer for lined tunnels |
| 02/06/1990 | US4898428 Power supply system for an underground mining machine |
| 02/01/1990 | DE3834101C1 Method of warning the personnel with regard to clear recognition of explosions in underground mining, and device for carrying out the method |
| 01/11/1990 | DE3821679A1 Anti-explosion and isolating device |
| 12/27/1989 | CN1006210B Trackless, center-pivot-steered underground vehicle driven by an electric motor |
| 12/07/1989 | DE3809401C1 Method of fitting an underground safety valve in the delivery line of an underground gas reservoir |
| 11/09/1989 | DE3814789A1 Cooling arrangement for machines in underground mining |
| 10/18/1989 | CN2046153U Small mine methane alarm and current breaking instrument |
| 10/12/1989 | DE3804987C1 Cable drag chain |
| 10/05/1989 | DE3825336C1 Device for opening the end of a compressed-air line provided as a deactivating line |
| 10/05/1989 | DE3809854A1 Hook claw for the roadway support in underground working for enclosing the support section when suspending a load |
| 10/04/1989 | CN2045429U Multipurpose liaison controller |
| 09/21/1989 | DE3808365A1 Protective housing for transmitters and/or radio receivers of a device which is used in underground mining |
| 09/20/1989 | CN2044642U Collapse alarm for cofferdam |
| 08/10/1989 | DE3901920A1 Apparatus for high-pressure injection |
| 08/01/1989 | US4852342 Cable handling chain |
| 07/26/1989 | CN1034244A Method and installation for preventing the main sector of mine shaft from being destroyed by explosive wave |
| 07/04/1989 | CA1256686A1 Process for consolidating and sealing coal and/or rock, soil and brick formations in mining, tunnelling and construction |