| 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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| 05/13/2009 | CN101429872A Hydraulic support atomizing de-dusting apparatus |
| 05/13/2009 | CN101429867A Major cycle slanting extraction method for coal mining work surface |
| 05/06/2009 | CN201232567Y Split type hydraulic support thrusting rod |
| 05/06/2009 | CN201232566Y Novel blasting top coal hydraulic support |
| 05/06/2009 | CN201232565Y Hyperstatic hydraulic support |
| 05/06/2009 | CN201232564Y Double-layer hyperstatic hydraulic support |
| 05/06/2009 | CN201232563Y Multilayer hyperstatic hydraulic support |
| 05/06/2009 | CN201232562Y Double-fork hyperstatic hydraulic support |
| 05/06/2009 | CN201232561Y Double-layer and double-fork hyperstatic hydraulic support |
| 05/06/2009 | CN201232560Y Multilayer and double-fork hyperstatic hydraulic support |
| 04/29/2009 | CN201230419Y Hydraulic support electrohydraulic controller box body bottom board |
| 04/29/2009 | CN201228548Y Rotating flow distribution device |
| 04/29/2009 | CN101418694A Composite slope guarding hydraulic support and use thereof |
| 04/29/2009 | CN101418688A Intelligent full automatic combine coal mining system |
| 04/23/2009 | DE102007049604A1 Valve arrangement consists of two recoil valves linked with pressure connection and connected with further recoil valves that are interconnected |
| 04/22/2009 | CN201225163Y Self-moving hydraulic support for coal mine shortwalling |
| 04/16/2009 | DE102007047761A1 Valve arrangement for support frame, has unlockable non-return valve with control connection connected with piston surface connection, and pressure pipe connection connected with ring surface connection of other unlockable non-return valve |
| 04/15/2009 | CN201221374Y Full-automatic coal mining production line hydraulic support electrohydraulic controller |
| 04/15/2009 | CN201221373Y Beam lifting apparatus for coal mine laneway hydraulic support |
| 04/15/2009 | CN201221372Y Beam lowering apparatus for coal mine laneway hydraulic support |
| 04/15/2009 | CN201221371Y Double-girder double-column hydraulic support stepping apparatus |
| 04/15/2009 | CN201221370Y Front and back containing type pillar mining specific hydraulic support |
| 04/15/2009 | CN201221369Y Left and right pillar mining recovery specific hydraulic support |
| 04/09/2009 | DE102007044641A1 Hydraulic cylinder i.e. corner cylinder, controlling valve, has piston connected with fluid body pipelines, inverse flow connecting pipe connected with sides of piston, and control piston whose one side is connected with control pipelines |
| 04/08/2009 | CN201218104Y Expansion beam used for thin seam hydraulic support |
| 04/08/2009 | CN101403312A Valve device |
| 04/02/2009 | DE102007060171B4 Verfahren zum Strebausbau in einem Bergwerk A method for longwall in a mine |
| 04/01/2009 | CN201215023Y Temporary support for drivage face |
| 03/25/2009 | CN101392840A Valve |
| 03/25/2009 | CN101392656A Hydraulic support electrohydraulic control system and ad hoc network method thereof |
| 03/18/2009 | CN201209458Y Handhold hydraulic support controller |
| 03/18/2009 | CN201209457Y Oblique top tunnel advanced support transversal moving forward support |
| 03/18/2009 | CN201209456Y Dipping and high-dipping fully-mechanized mining hydraulic support hydraulic side waste rock blocking device |
| 03/11/2009 | CN201206468Y Double hook lever type development machine with safety suspension device |
| 03/11/2009 | CN101382076A Hydraulic support |
| 03/04/2009 | CN201202486Y Advanced support alternating forward support of inclined top laneway |
| 03/04/2009 | CN201202485Y Large extracting high hydraulic support |
| 02/25/2009 | CN201198760Y Safe high-efficiency integrative matching equipment of large excavating high automatic fully mechanized working face |
| 02/25/2009 | CN101372891A Strip filling integral backstopping coal mining method |
| 02/24/2009 | US7494190 Coal face support in a mine |
| 02/19/2009 | WO2008138316A3 Shield control device for carrying out the longwall function of a longwall unit in the longwall face working in a mine |
| 02/19/2009 | DE102007035848A1 Ausbauschild Longwall shield |
| 02/04/2009 | CN201190576Y Thrust gear suitable for hydraulic support |
| 02/04/2009 | CN201190575Y Connecting bar type hydraulic support at fully-mechanized mining working faces for thin seam |
| 02/04/2009 | CN201190574Y Rocker type hydraulic support at fully-mechanized mining working faces for thin seam |
| 02/04/2009 | CN201190573Y Inserting plate type hydraulic support at fully-mechanized mining working faces for thin seam |
| 02/04/2009 | CN101358532A Shield support |
| 01/28/2009 | CN201187320Y Operating valve |
| 01/28/2009 | CN201187319Y Vehicle mounted self-strengthening laneway advanced support combined apparatus |
| 01/28/2009 | CN201187318Y Top and bottom interconnecting type hydraulic support |
| 01/28/2009 | CN201187316Y Balance hoisting jack bidirectional lock and hydraulic support |
| 01/28/2009 | CN101353966A Assembled support |
| 01/21/2009 | CN201184207Y Main control valve of hydraulic support electrohydraulic control system |
| 01/21/2009 | CN101349156A Backwashing high pressure filtering station |
| 01/20/2009 | US7478884 Hydraulic switching mechanism for longwall supports |
| 01/15/2009 | WO2009006692A1 A mesh system |
| 01/15/2009 | CA2692950A1 A mesh system |
| 01/14/2009 | CN201180556Y Hydraulic support control terminal based on wireless communication technology |
| 01/14/2009 | CN201180555Y Light hydraulic support |
| 01/14/2009 | CN201180554Y Hydraulic support |
| 01/14/2009 | CN101344008A Three and four-stage double-telescopic rod stabilizing mechanism of hydraulic support |
| 01/14/2009 | CN101344007A Hydraulic system for supplying work medium with different filter fineness to different elements of hydraulic support |
| 01/13/2009 | US7476058 Mining roof support frame with base skids lifting device |
| 01/07/2009 | CN101338684A Combined guided slipping type forepoling hydraulic support |
| 12/31/2008 | CN201173127Y Large flow safety valve for hydraulic support hydraulic-oil cylinder |
| 12/31/2008 | CN201173125Y Linked bidirectional lock for cover type hydraulic support first and second level protecting boards |
| 12/31/2008 | CN201173124Y Balancing bidirectional lock possessing pressure compensate function for balancing hoisting jack |
| 12/31/2008 | CN101333933A Hyperstatic hydraulic support |
| 12/31/2008 | CN101333932A Double layer hyperstatic hydraulic support |
| 12/31/2008 | CN101333931A Multiple layer hyperstatic hydraulic support |
| 12/31/2008 | CN101333930A Multiple layer double-fork type hyperstatic hydraulic support |
| 12/31/2008 | CN101333929A Multiple layer double-fork type hyperstatic hydraulic support |
| 12/31/2008 | CN101333928A Multiple layer double-fork type hyperstatic hydraulic support |
| 12/24/2008 | CN201170109Y Magnetic current transformer electrical pilot operated directional control valve for hydraulic support |
| 12/24/2008 | CN201170108Y Extension sleeve light placing support |
| 12/24/2008 | CN201170107Y Immediate support device for digging machine |
| 12/24/2008 | CN201168497Y Back washing type high pressure filter station |
| 12/24/2008 | CN101328807A Rotating flow distribution apparatus |
| 12/16/2008 | CA2406623C Mining machine and method |
| 12/10/2008 | CN201162539Y Suspension type assembled stand |
| 12/10/2008 | CN101319613A Twin-beam twin-column stepping leading hydraulic support |
| 12/10/2008 | CN100441831C Ladder type mining method using united pillars to support roof and partition stope |
| 12/03/2008 | CN101315031A Fully mechanized caving face along-track end bracket |
| 12/02/2008 | US7458307 Hydraulic control for a longwall support |
| 11/25/2008 | US7455368 Control mechanism for the extension units in the longwall face of a mine |
| 11/25/2008 | US7455367 Longwall support control for controlling the movements of longwall support units in the longwall of a mine |
| 11/20/2008 | WO2008138316A2 Shield control device for carrying out the longwall function of a longwall unit in the longwall face working in a mine |
| 11/19/2008 | CN201152178Y Two column covering type low coal seam bracket |
| 11/19/2008 | CN101307690A Combined automatic control coal cutter |
| 11/13/2008 | DE10314867B4 Mehrstufiges Steuerventil insbesondere für den untertägigen Schildausbau und Schildausbau Multi-level control valve especially for underground roof support and shield support |
| 11/13/2008 | DE10207698B4 Strebsteuerung für den Strebausbau Longwall control for the longwall |
| 11/05/2008 | CN201144709Y Suspension-shift hydraulic support with overturning beam |
| 10/30/2008 | DE10029918B4 Verfahren und Einrichtung zum Erfassen der Anwesenheit von Personen im untertägigen Bergbau Method and apparatus for detecting the presence of people in underground mining |
| 10/29/2008 | CN201141307Y Suspension hydraulic support with front cantilever |
| 10/29/2008 | CN201141305Y 1200 liter flat type, long service life, anti-pollution coal mine hydraulic support safety valve |
| 10/23/2008 | DE102007018021A1 Hydraulikstempel mit dünnwandigen Außen- und Innenrohren Hydraulic ram with thin-walled outer and inner tubes |
| 10/22/2008 | CN201137501Y Manual type adjacent chock mutual control hydraulic support control circuit |
| 10/22/2008 | CN201137500Y Coal mine down-hole split articulation type advanced support bracket |
| 10/22/2008 | CN201137499Y Laneway driving advanced support bracket |
| 10/22/2008 | CN101289939A Integrated suspension device for retaining a lane for next sublevel |