| Patents for E21F 16 - Drainage (1,138) |
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| 06/09/2010 | CN101725369A Automatic drainage system for cable tunnel |
| 06/09/2010 | CN101285397B Submarine tunnel transverse water collecting tank |
| 06/02/2010 | CN201496075U High-density polyethylene 12-20 mm height dewatering protective plate |
| 05/26/2010 | CN201486589U Automatic water drainage device for coal-mine gas extraction pipe |
| 05/19/2010 | CN101709645A Method for locally taking soil to reclaim mining subsidence areas of thick coal seams of mining areas |
| 05/12/2010 | CN201460980U High-speed railway loess tunnel drainage facility |
| 05/12/2010 | CN201460979U Detachable glass fiber reinforced plastic ditch pipe groove |
| 05/12/2010 | CN201460978U Mine water drainage automatic device |
| 05/12/2010 | CN201460977U Mine bearing pressure water self-discharge system |
| 05/12/2010 | CN201460960U Drainage device for colliery gas extracting system |
| 05/12/2010 | CN201460839U Hydraulic lifting device for oil pipe power pump |
| 05/05/2010 | CN201448121U Tailing drain device |
| 04/28/2010 | CN101699033A Device for pumping and draining water from downward hole of coal bed |
| 04/21/2010 | CA2642181A1 Method to speed up the consolidation process of tailing slurry by embedded drainage system |
| 04/14/2010 | CN201437729U Cross-shaped intersection for comprehensive pipe canals |
| 03/17/2010 | CN201424956Y Drainage device of gas drainage pipeline |
| 03/10/2010 | EP2160505A1 A draining pipe mesh |
| 02/03/2010 | CN201396190Y Pneumatic drainage device |
| 01/27/2010 | CN201391337Y Automatic drainage system of cable tunnel |
| 01/27/2010 | CN201391336Y Coal slurry digger |
| 01/13/2010 | CN201381878Y Remote monitoring drainage device of cable tunnel |
| 01/13/2010 | CN201381874Y Coal bed pressure measurement gas water separation device |
| 12/30/2009 | CN201372808Y High negative pressure U-shaped automatic drainage device of gas drainage pipeline |
| 12/23/2009 | CN100572754C Coal-mine water-house coal mud clearing and conveying apparatus |
| 12/23/2009 | CN100572753C Apparatus for cleaning and transporting coal-mine water sump slurry |
| 12/16/2009 | CN201363161Y Negative pressure pipe automatic drainage device |
| 12/09/2009 | CN100567705C Flame-proof and safety type digitisation automatically drain system for mining |
| 12/02/2009 | CN101592042A Mine confined water self-discharging system |
| 11/18/2009 | CN100560944C Aquifer preventing and controlling method for coal face roof plate separation layer |
| 10/28/2009 | CN101566073A Dual-source heat-supply water-drainage antifreezing method for construction joint of tunnel in cold area |
| 10/28/2009 | CN101566067A Entire-underground cable tunnel safety manhole being used also as ventilation shaft |
| 10/14/2009 | CN101555803A Method for preventing accumulation of downhole floating coal of coal mine |
| 09/23/2009 | CN101539783A Automatic pumping controller |
| 09/16/2009 | CN201310381Y Tunnel toroidal drainpipe with stripped insulating layer |
| 09/16/2009 | CN201310380Y Novel water storage and discharging plate |
| 08/26/2009 | CN201297181Y Water discharge device moved with pipe in coal mine gas extraction pipeline |
| 08/19/2009 | CN101509397A Well surface viewing screen for mine drainage operation situation |
| 08/19/2009 | CN101509396A Water position slurry clearing and dugging machine for coal mine |
| 08/12/2009 | CN101503965A Coal slurry excavating and processing method for coal mine water warehouse |
| 07/23/2009 | WO2009091599A1 Automatic flooding protection for underground ventilation ducts |
| 07/08/2009 | CN101476486A Automatic monitoring system for down-hole central pumping room drainage |
| 07/08/2009 | CN100510321C Mine water sump duff fluid automatic cleaning and treating method and apparatus |
| 06/23/2009 | CA2589332C Method and system for accessing subterranean deposits from the surface |
| 06/17/2009 | CN100501132C System for cleaning water sump settling down well |
| 05/20/2009 | CN201241706Y Waste water cycling and reutilizing apparatus of open type tunnel boring machine |
| 05/20/2009 | CN101435342A Tunnel ring direction drainpipe equipped with strip heat-insulating layer |
| 05/12/2009 | US7530765 Structure of intermediate wall of three arch excavated tunnel and method for constructing the same |
| 05/06/2009 | CN201232571Y Big lane water drenching drainage shed frame |
| 05/06/2009 | CN201232570Y Mining explosion suppression automatic water discharging monitor |
| 04/22/2009 | CN101413401A Method and apparatus for discharging water and slag of coal mine deep hole |
| 04/15/2009 | CN201221381Y Tunnel main drainpipe bracket |
| 04/08/2009 | CN101403316A Down-hole sluice valve installation method for straight-through type drainage hole of high pressure water tap |
| 04/07/2009 | US7513712 Device and a method for drainage of water from rock caves |
| 03/18/2009 | CN101387204A Coal dehydration technology under hole for coal mine |
| 03/11/2009 | CN201206475Y Active door post of downhole water protecting gate of mine |
| 02/18/2009 | CN201195836Y High-strength grille type plastic foramen magnum water penetrating cage |
| 02/11/2009 | CN201193537Y Water drain plate |
| 02/11/2009 | CN201193536Y Soil discharging apparatus for sump |
| 01/21/2009 | CN201183959Y Composite water drain-proof plate |
| 01/21/2009 | CN101349162A Pump flooding-proof and water dropping-proof method of mine water pump and improved apparatus |
| 01/21/2009 | CN101349161A Seepage flow type back water well of dry method storage yard |
| 01/08/2009 | WO2009005438A1 A draining pipe mesh |
| 12/31/2008 | CN201173138Y Coal mine downhole water storehouse dredging machine |
| 12/31/2008 | CN101333934A Tunnel ice-making water stopping processing method |
| 12/24/2008 | CN101328791A Method and system for accessing subterranean deposits from the surface |
| 11/12/2008 | CN201148879Y Mash gas pumping and draining pipeline automatic slag discharging drainage device |
| 10/29/2008 | CN101294499A Double-function vacuum apparatus for extracting mash gas and lifting groundwater for coal mine safety |
| 10/22/2008 | CN201137504Y Negative-pressure pipeline automatic drainage device |
| 10/15/2008 | CN101285397A Submarine tunnel transverse water collecting tank |
| 10/01/2008 | EP1975369A2 Method and system for accessing subterranean deposits from the surface |
| 08/20/2008 | CN201103521Y Pump suction type deposit collector |
| 08/20/2008 | CN201103413Y Drum type pipe dragging and conveying equipment |
| 08/13/2008 | CN100410492C Centralized water discharge apparatus and method for tunnelling |
| 07/23/2008 | CN201090242Y Floatage type output pipe for cleaning mine underground water storehouse |
| 07/09/2008 | CN100400794C Method and system for accessing substerranean deposits from the surface |
| 06/18/2008 | CN101200905A Method for cleaning mine sump deposit and sump silt cleaner |
| 06/11/2008 | CN101196123A Aquifer preventing and controlling method for coal face roof plate separation layer |
| 05/29/2008 | US20080121399 Method and system for accessing subterranean deposits from the surface |
| 04/23/2008 | CN201050383Y Spiral material-feeding type mine sump cleaner |
| 04/16/2008 | CN201047292Y Plugging apparatus for mechanical water-shutoff construction of mine lane oculus elephantinus |
| 04/09/2008 | CN101158288A Flame-proof and safety type digitisation automatically drain system for mining |
| 04/09/2008 | CN101158267A Method and system for accessing subterranean deposits from the surface |
| 04/02/2008 | CN201043475Y Drainage device for deep well in mine |
| 03/13/2008 | US20080060800 Method and system for accessing subterranean deposits from the surface |
| 03/11/2008 | CA2334025C Installation for storing of natural gas |
| 02/20/2008 | CN201025059Y Under-well wind-blocking over flow device for mine coal |
| 01/30/2008 | CN101113663A Mechanical water-shutoff construction method of mine hydrophthalmos and plugging apparatus for water-shutoff |
| 01/23/2008 | CN101109286A System for cleaning water sump settling down well |
| 01/16/2008 | CN201006842Y Stope filling pipeline drainage and cleaning water stage treatment system |
| 12/26/2007 | EP1619352A9 Method and system for accessing subterranean deposits from the surface |
| 10/11/2007 | DE102006054527A1 Drainage system for removing water from roads and tunnels comprises collecting channels arranged in a drainage system and having a double drainage pipe arrangement with drainage pipes moving against each other |
| 10/10/2007 | CN101050709A High water pressure releasing and blocking mining method for mining area |
| 09/19/2007 | CN200949533Y Coal mine down-hole tunnel temporary automatically staring and stopping device for water pump in small water sump |
| 09/19/2007 | CN200949475Y Gas exhausting automatic water discharging device |
| 08/01/2007 | CN101008317A Coal mine safety disaster-resistant type automatic main drainage system |
| 07/24/2007 | CA2483023C Method and system for accessing subterranean deposits from the surface |
| 06/13/2007 | CN2911189Y Natural disasters simulator for pit |
| 05/16/2007 | CN2900769Y Anti-blowount valve for mine downhole drilling hole |
| 05/02/2007 | EP1102903B1 Tyre foundation structure |
| 02/14/2007 | CN1912346A Mine emergency drainage danger eliminating scheme |