| Patents for E21F 16 - Drainage (1,138) |
|---|
| 05/30/1995 | CA2038280C Fluid pressure feeding apparatus |
| 05/24/1995 | CN2198259Y 水泵自动控制器 Automatic Pump Controller |
| 11/16/1993 | US5261794 Fluid pressure feeding apparatus |
| 08/12/1992 | CN1017820B Method of dewatering subterranean space, esp. for mine |
| 07/09/1992 | DE4100309A1 Cleaning unit for long basins or mine channels - comprises floating sludge tank joined to pump assembly by flexible linkage, for sludge removal at fixed intervals |
| 05/20/1992 | CN2104932U Mine sump cleaner |
| 05/08/1991 | EP0305415B1 Mobile pump installation |
| 04/18/1991 | DE3934079A1 Pump pressure pipe for mobile bridge in mining roadway - connects pump to sludge transporter pipe which passes at roof level to discharge outside the area |
| 11/14/1990 | CN1010423B Process for sealing off the water flowing in tunnels, mine entries, canals and other known subsurface ducts |
| 06/19/1990 | US4934874 For clearing sludge from the galleries of underground mines |
| 06/13/1990 | CN1042966A Method of dewatering subterranean space, esp. for mine |
| 08/30/1989 | CN2043667U Gas-pressurized drainage for mine |
| 08/02/1989 | CN2042111U Pressing-rise type drainage system with added"successive drainage pipe" |
| 07/26/1989 | CN2041726U Efficiency monitor for drainage system |
| 05/18/1989 | DE3833943A1 Invert |
| 03/08/1989 | EP0305415A1 Mobile pump installation. |
| 02/08/1989 | CN2032250U Pneumatic drain system for deep hole |
| 12/14/1988 | EP0294740A1 Drainpipe and method of inserting it |
| 08/25/1988 | WO1988006211A1 Mobile pump installation |
| 06/01/1988 | DE3707314C1 Apparatus for the disposal of sludge from pits, particularly from locomotive maintenance sumps in underground workings |
| 05/05/1988 | DE3637063A1 Covering for discharge channels |
| 03/02/1988 | CN85105851B Method and equipment for blocking water currents with filled sacks |
| 02/17/1988 | CN86102289A Partitioned settler for jigging water containing silt |
| 01/27/1988 | CN87103870A Process for sealing off the water flowing in tunnels, mine entries, canals and other known subsurface ducts |
| 10/01/1987 | DE3608937A1 Method and device for removing solid matter from shaft sumps |
| 03/04/1987 | CN85105851A Method and equipment for blocking water currents with filled sacks |
| 01/06/1987 | US4634045 Dewatering screen manufacture and method thereof |
| 06/04/1986 | EP0132269B1 A method of excavating underground caverns in rock |
| 03/26/1986 | CN85200593U Pool for pumping out mine or turnel waste water |
| 02/25/1986 | US4572707 Method in the excavation of underground caverns in rock |
| 01/30/1985 | EP0132269A1 A method of excavating underground caverns in rock. |
| 09/11/1984 | CA1174256A1 Method and apparatus for the filling of a slurry sump |
| 07/19/1984 | WO1984002741A1 A method in the excavation of underground caverns in rock |
| 07/21/1983 | WO1983002409A1 Dewatering screen manufacture and method thereof |
| 11/16/1982 | US4359298 Method and apparatus for the filling of a slurry sump |
| 09/14/1982 | US4349228 Method for dewatering a subterranean formation via a borehole |
| 11/17/1981 | US4300861 Method of using admixture of water-soluble polymers in latex form and gypsum as seepage control agents |
| 11/09/1976 | US3990249 Method and an apparatus for producing a draining channel |