| 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) |
|---|
| 03/26/1987 | DE3532655A1 Liquid-tight construction under a waste tip, a method of subsequently introducing it and an apparatus for carrying out the method |
| 03/19/1987 | DE3532941A1 Arrangement for controlling the slide-bar cylinder of hydraulic self-advancing support units |
| 03/18/1987 | EP0214359A1 Posterior sealing employing mining techniques |
| 03/11/1987 | CN86104688A Starting method of hydraulic device in underground dislodging |
| 03/05/1987 | DE3544992C1 Multiple telescopic cylinder with integrated displacement-measuring device |
| 02/19/1987 | DE3528864A1 Apparatus for introducing a layer impermeable to water into a waste tip |
| 02/17/1987 | US4643392 Valves |
| 01/29/1987 | DE3526746A1 Safety filter for props or walking mechanisms |
| 01/27/1987 | US4639169 Mineral mining installation |
| 01/02/1987 | DE3521819A1 Hydraulic face support |
| 01/02/1987 | DE3521793A1 Face/roadway transfer arrangement in underground mining operations |
| 12/16/1986 | US4629368 Shield supports suitable for use in mines |
| 12/16/1986 | CA1215290A1 Hydraulic control valve for mining jack |
| 12/04/1986 | WO1986007107A1 Method and device for post-setting a liquid impervious layer in extended dumping grounds and contaminated areas in order to protect ground waters |
| 11/18/1986 | US4622998 Hydraulic control device |
| 10/21/1986 | US4617954 Valve assemblies |
| 10/01/1986 | CN85109637A Method and system of controlling the operation of a coal working machine |
| 09/30/1986 | CA1212012A1 Control valve |
| 09/24/1986 | CN86101783A Hydraulic roof support |
| 09/23/1986 | US4613257 Hydraulic control arrangement |
| 09/23/1986 | US4613256 Supporting frame |
| 09/02/1986 | US4609308 Roof support suitable for use in mines |
| 08/27/1986 | CN85109597A Hydraulic control system of a mining support |
| 08/26/1986 | US4607986 Shield supports suitable for use in mines |
| 08/13/1986 | CN86100222A Generator for dynamic loading of mine lining |
| 08/12/1986 | US4605341 Mine roof support and attachment means therefor |
| 07/15/1986 | US4600340 Mine roof support unit |
| 07/09/1986 | CN85107956A Mechanized apparatus for two coal planer working on one coal face |
| 05/21/1986 | EP0181799A1 Mechanized device comprising two devices for excavating minerals from a seam |
| 05/10/1986 | CN85105216A Method of changing machinability and workability of bed and means for implementation thereof |
| 05/06/1986 | US4586851 Levelling ram for roof-shield mine support systems |
| 05/06/1986 | US4586424 Hydraulic control arrangement |
| 04/08/1986 | US4580594 Valve devices |
| 03/04/1986 | US4573828 Roof support suitable for use in mines |
| 02/25/1986 | US4572709 Control apparatus |
| 02/18/1986 | US4571127 Advance mechanism for mine roof support units |
| 02/04/1986 | US4568222 Mine-roof supports |
| 01/29/1986 | CN85200574U Metal backing deals for coal face in coal mine |
| 01/14/1986 | US4564047 Control valve |
| 01/07/1986 | US4563111 Mine roof supports |
| 12/24/1985 | US4560306 Coal face support |
| 12/10/1985 | US4557635 Shield-type support frame |
| 12/10/1985 | US4557293 Arrangement for controlling an electro-hydraulic valve |
| 12/10/1985 | US4557290 Hydraulic slide control safety valve for a mine support jack |
| 11/12/1985 | US4552488 Mine roof support system |
| 11/12/1985 | US4552487 Mine roof support unit having dust suppression means |
| 10/29/1985 | US4549469 Hydraulic ram |
| 10/22/1985 | US4548527 Roof support suitable for use in mines |
| 10/15/1985 | US4547098 Mining equipment, mainly for extraction of heavy beds |
| 08/27/1985 | US4537221 Hydraulic control devices for use with mining apparatus |
| 08/13/1985 | US4534681 Mine roof supports |
| 07/02/1985 | US4526495 Mine roof support assembly |
| 06/25/1985 | US4525104 Roof support for tunnel excavator |
| 06/04/1985 | CA1188118A1 Gob canopy for a mine roof support |
| 05/21/1985 | US4518285 Control system for longwall mining roof supports |
| 05/21/1985 | US4518284 Mine roof supports |
| 05/14/1985 | US4516601 For a cylinder of a mine prop |
| 04/23/1985 | US4512686 Roof support suitable for use in mines |
| 04/16/1985 | US4511290 Support frame for underground mining operations |
| 03/19/1985 | US4505517 Self-advancing mine roof supports |
| 03/19/1985 | US4505299 3-Port, 2-position directional control valve |
| 01/08/1985 | US4492495 Roof support for use in mines |
| 01/01/1985 | US4491441 Self-advancing support and control means therefor |
| 12/25/1984 | US4490076 Underground support devices |
| 12/11/1984 | US4487531 Travelling bracket |
| 12/04/1984 | US4485724 Hydraulic control apparatus |
| 11/06/1984 | US4480946 Gob canopy for a mine roof support |
| 10/16/1984 | US4476898 Mine-roof support control means |
| 10/02/1984 | US4474510 Hydraulic mine-roof support |
| 09/25/1984 | US4473324 Mine roof supports |
| 08/14/1984 | US4465408 Mine-roof support control mechanism |
| 08/14/1984 | US4465407 Fixing bridge |
| 08/14/1984 | US4465406 Mine roof support unit |
| 08/01/1984 | EP0114639A2 Control for a hydraulic prop of advancing mine roof supports |
| 07/03/1984 | US4457212 Hydraulic ram |
| 06/12/1984 | US4453846 For measuring advance of mobile equipment |
| 05/29/1984 | US4451181 Control systems for mineral mining installations |
| 05/22/1984 | US4449860 Mine roof supports |
| 05/22/1984 | US4449859 Mineral mining installation |
| 05/08/1984 | US4447174 Cap positioning mechanism |
| 05/08/1984 | CA1166936A1 Hydraulic ram |
| 05/01/1984 | CA1166460A1 Mineral mining installation |
| 04/17/1984 | US4443135 Control apparatus |
| 04/17/1984 | CA1165572A1 Mine-roof supports |
| 04/03/1984 | US4440522 Hydraulic control arrangement for a roof support unit of a mineral mining installation |
| 02/28/1984 | US4433945 Method and apparatus for controlling a mine roof support |
| 02/21/1984 | US4432673 Mine roof support |
| 02/07/1984 | US4430693 Illuminating device for underground mining |
| 02/07/1984 | US4430026 Roof support suitable for use in mines |
| 01/24/1984 | US4427321 Mineral mining installation |
| 12/27/1983 | US4422808 Hydraulically-operated devices |
| 12/27/1983 | US4422807 Mine roof supports |
| 12/13/1983 | US4420278 Heading shield |
| 11/22/1983 | US4416566 Supporting apparatus for the protection of mine gate crossings |
| 11/15/1983 | US4415295 Mineral mining installations |
| 11/08/1983 | CA1156479A1 Mining equipment, mainly for extraction of heavy beds |
| 10/25/1983 | US4411559 Mining system |
| 10/25/1983 | US4411558 Roof support suitable for use in mines |
| 09/27/1983 | US4406565 Slidable filling dam |
| 09/20/1983 | US4404893 Hydraulic mine prop |