| Patents for E21D 23 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyers, mining machines, or guides therefor (3,544) |
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| 02/20/2008 | CN201025044Y A conversion valve with operation pressure 31.5MPa |
| 02/19/2008 | US7331735 Apparatus, system, and method for supporting a gate entry for underground full extraction mining |
| 02/06/2008 | CN201016299Y Mining hydraulic support explosion-proof automatic control system |
| 02/06/2008 | CN100366966C Pressure relief valve |
| 01/30/2008 | CN201013399Y Rotary type two-stage side-protection device |
| 01/30/2008 | CN201013398Y Tail boom for hydraulic support |
| 01/30/2008 | CN201013397Y High-dipping fully-mechanized mining hydraulic support |
| 01/23/2008 | CN101109284A Foreset control device |
| 01/16/2008 | CN201007216Y Mining with filling hydraulic support |
| 01/16/2008 | CN101105136A Four column protected type hydraulic prop frame for low position blasting down the roof coal |
| 01/16/2008 | CN101105135A Two column protected type hydraulic prop frame for low position blasting down the roof coal |
| 01/09/2008 | CN201003410Y Support transferring device |
| 01/09/2008 | CN201003409Y Advancing slip type hydraulic support |
| 01/09/2008 | CN201003405Y Water spray valve |
| 01/09/2008 | CN101100941A Down-hole coal excavation apparatus |
| 01/02/2008 | CN200999626Y Telescopic girder used for hydraulic support top beam |
| 01/02/2008 | CN200999625Y Cover type hydraulic support |
| 01/02/2008 | CN200999624Y Thrusting rod used for hydraulic support |
| 01/02/2008 | CN200999623Y Collapsible two stages side protection mechanism |
| 01/02/2008 | CN200999622Y Fully Mechanized working faces along track end head bracket |
| 01/02/2008 | CN101096912A Coupling mechanism used by face support controller |
| 01/02/2008 | CN101096911A Fully mechanized working faces along conveying end head bracket |
| 01/02/2008 | CN100359132C Hydraulic coal mine support for low-position roof blasting-down |
| 12/27/2007 | US20070299546 Automated, low profile drilling/bolting module with single button operation |
| 12/12/2007 | CN200989215Y Underground support conveyer wagon |
| 12/12/2007 | CN200989211Y Comprehensive mining hydraulic support operating valve |
| 12/12/2007 | CN200989210Y Hydraulic bidirectional lock |
| 12/12/2007 | CA2550247A1 Grout pack restraining system |
| 12/05/2007 | CN200985801Y Plug-in mounting type pilot operated check valve |
| 12/05/2007 | CN200985800Y Bidirectional lock |
| 12/05/2007 | CN200985799Y Alley way advanced support bracket |
| 12/05/2007 | CN200985796Y Plug-in mounting type bidirectional lock |
| 12/05/2007 | CN200985795Y 单向锁 One-way lock |
| 12/05/2007 | CN200985794Y Liquid return circuit turnoff valve |
| 11/28/2007 | CN200982201Y Self-walking type light hydraulic support |
| 11/28/2007 | CN200982200Y Integral top beam combined suspended flexible hydraulic support |
| 11/28/2007 | CN200982199Y Hydraulic support front gangue-barrier device for slanted and sharply slanted fully-mechanized mining |
| 11/28/2007 | CN101078351A Electric-hydraulic control low coal seam shield type hydraulic support |
| 11/21/2007 | CN200978680Y Hydraulic support |
| 11/14/2007 | CN200975262Y Comprehensive mining support operation handle locking protection apparatus |
| 11/14/2007 | CN101070761A Digging-protecting integrated digging-protecting machine |
| 11/07/2007 | CN101067377A Liquid control one-way valve for suspension moving root bar hydraulic chock |
| 10/31/2007 | DE102006019132A1 Druckbegrenzungsventil mit indirekter Dämpfung Pressure relief valve with indirect damping |
| 10/25/2007 | DE102006018542A1 Druckbegrenzungsventil mit direkter Dämpfung Pressure relief valve with direct attenuation |
| 10/24/2007 | CN200964858Y Dredging, protection, anchoring integral tunneling apparatus |
| 10/17/2007 | CN200961485Y Front beam drag type hydraulic support apparatus |
| 10/03/2007 | CN100340777C Hydraulically switchable directional control valve |
| 09/26/2007 | CN200952405Y Double-stage double-acting column for hydraulic prop |
| 09/26/2007 | CN200952404Y Top beam rolling hydraulic prop |
| 09/26/2007 | CN200952403Y Coal mine working face crossheading leading supporting hydraulic prop |
| 09/19/2007 | CN101037945A 6.3 meters high support covering hydraulic support |
| 09/13/2007 | DE202007009841U1 Liegendkufe für Schildausbaugestell und Schildausbaugestell Floor runner for shield support frame and shield support frame |
| 09/13/2007 | DE202007007846U1 Ventilpatrone zur auswechselbaren Anordnung in einem Ventilblock eines Schildausbaus Valve cartridge for an interchangeable arrangement in a valve block a shield support |
| 09/05/2007 | CN101029572A Automatic explosion-proof controlling system for mine hydraulic stand |
| 09/05/2007 | CN101029273A Liquefied concentrate for hydraulic stand |
| 08/29/2007 | CN200940495Y Cog hydraulic support of articulated base special light thin coal layer |
| 08/29/2007 | CN101025088A Novel self-moving type lame advanced supporting rack |
| 07/25/2007 | CN2926511Y Transporting-end hydraulic stand for comprehensive working face |
| 07/25/2007 | CN101004138A Method for preventing hitch of hydraulic support from being filled by crushed gangue |
| 07/12/2007 | DE202007006668U1 Stempelkopfaufnahme und Schildausbaugestell hiermit Stamp recording head and shield support frame hereby |
| 07/11/2007 | CN2921287Y Hydraulic support four linkage rod device |
| 07/05/2007 | DE19946848B4 Druckbegrenzungsventil mit Dämpfung Pressure relief valve with damping |
| 07/04/2007 | EP1597484B1 Method and device for pressure amplification in cylinders, in particular hydraulic rams |
| 07/04/2007 | CN2918738Y Modular combined hydraulic support device |
| 07/04/2007 | CN1991131A Low coal seam coverture type hydraulic support |
| 07/03/2007 | US7238055 Individual controller for shield support frames |
| 07/03/2007 | US7237983 Hydraulic shield support |
| 06/28/2007 | DE19751007B4 Steuergerät für elektrohydraulische Ausbausteuerungen Controller for electro-hydraulic system controllers |
| 06/27/2007 | CN1987046A Supporting type continuous tunnelling machine |
| 06/13/2007 | CN2911187Y Digging-protecting integrated development machine |
| 06/13/2007 | CN2911186Y Conveying end support of integrated working surface |
| 06/06/2007 | CN2908786Y High seam shield hydraulic support |
| 06/06/2007 | CN2908785Y Prop end support between joist and prop of support |
| 06/06/2007 | CN1975110A Arrangement for the admission of pressurized water to spray systems |
| 05/31/2007 | DE202007004740U1 Schreitausbaugestell für den untertägigen Bergbau Powered roof rack for underground mining |
| 05/23/2007 | EP1685342B1 Pressure relief valve |
| 05/09/2007 | CN1959065A Hydraulic bracket in step type |
| 05/09/2007 | CN1959064A Electrohydraulic controlled reversal valve in use for hydraulic support |
| 04/25/2007 | CN2893150Y Combined linear hydraulic support |
| 04/19/2007 | DE19937252B4 Abspanneinrichtung für Förder- und/oder Gewinnungsanlagen Bracing device for conveying and / or production equipment |
| 04/18/2007 | CN2890341Y Excavation hydraulic support |
| 04/18/2007 | CN1948715A Supply line |
| 04/10/2007 | US7201541 Prop head bearing |
| 03/29/2007 | DE202007000433U1 Bolzen-Schlag-Zugsystem Dart impact tension system |
| 03/22/2007 | US20070065236 Mining roof support frame with base skids lifting device |
| 03/21/2007 | CN1932240A Full-seam cutting, retreating, separate moving and full-caving comprehensive mechanized coal mining method and equipment |
| 03/14/2007 | CN1928323A Light hydraulic support for cannon sampled thin coal layer |
| 03/07/2007 | CN1303331C Electromagentic switching apparatus |
| 03/01/2007 | US20070044647 Hydraulic switching mechanism for longwall supports |
| 02/15/2007 | DE19813909B4 Hydraulisch aufsteuerbares Rückschlagventil für die Ausbauhydraulik in Bergbau-Untertagebetrieben Hydraulic aufsteuerbares check valve for hydraulic expansion in mining underground operations |
| 02/14/2007 | CN2869327Y Front-rear combined support shield type coal pillar recovery hydraulic support |
| 02/13/2007 | US7177709 Controller for underground mining |
| 02/07/2007 | CN2866822Y Thin coal seam shielding hydraulic support |
| 02/07/2007 | CN2866821Y Mining sectional support and self-moving support base-digging device for the same support |
| 02/07/2007 | CN2866820Y Gril capable of putting top coal |
| 01/25/2007 | DE19737936B4 Abbaueinrichtung für den Untertagebergbau, insbesondere für die Kohlegewinnung in Strebbetrieben Mining equipment for underground mining, especially for coal mining in longwall operations |
| 01/24/2007 | CN2861491Y Inside and outside supported and protected pillar extraction hydraulic support |
| 01/24/2007 | CN2861490Y Left and right fixing combined type pillar extraction hydraulic support |
| 01/24/2007 | CN2861489Y Inside and outside protected pillar extraction hydraulic support |
| 01/24/2007 | CN1900486A Automatic moving type tunnel advance support rack |