| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 01/21/1988 | DE3624168A1 Resilient load prop |
| 01/13/1988 | CN87206968U High field-intensity twisting-type casing pipe |
| 01/13/1988 | CN87206911U Insert bottom type contractable metal support |
| 01/13/1988 | CN87201459U Pressure-displayed hydraulic jack |
| 01/06/1988 | CN87206850U Spring propping board |
| 12/31/1987 | CN87208216U Improved folding metal friction prop with increased friction drag |
| 12/31/1987 | CN87202634U Telescopic prop made of i-steel beam |
| 12/30/1987 | CN87206913U Sliding hydraulic chock for cap of coal mine |
| 12/26/1987 | CN87208328U Hydraulic support with large step displacement for coal mines |
| 12/15/1987 | US4712947 Mine support prop |
| 12/12/1987 | CN86210316U Anti-impacting upright column |
| 12/02/1987 | CN87206158U Collar type metal base of prop |
| 11/12/1987 | DE3712635A1 Hydraulischer arbeitszylinder, insbesondere in im bergbau ueblichen stempeln Hydraulic cylinders, especially in the mining usual stamp |
| 11/04/1987 | CN87203207U Swing board plug skylight-type hydraulic supporter for laying top coal |
| 10/22/1987 | DE3707288A1 Device for the mounting and dismounting of hydraulic props |
| 10/22/1987 | DE3613444A1 Apparatus for testing pit props |
| 10/21/1987 | CN87202792U Elastic lightweight hydraulic stand |
| 10/21/1987 | CN87200455U Elastic-plastic single pillar |
| 10/03/1987 | CN86203486U Simple hydraulic support with slided top beam |
| 09/30/1987 | CN86201892U Hydraulic strut for placing adit roof |
| 09/22/1987 | CA1227047A1 Support pack |
| 09/16/1987 | CN86203286U Individual hydraulic prop with light alloy-core tube |
| 09/16/1987 | CN86202777U Ladderlike canopy fixator for headwork face in coal mine |
| 09/02/1987 | CN86206386U Single-wedged and inclined type cable clip |
| 08/06/1987 | DE3602776A1 Method of securing the roadside edges in longwall face mining, and pack of construction material |
| 07/28/1987 | CA1224634A1 Yieldable stilt for mine roadways |
| 06/04/1987 | DE3541871A1 Set of hydraulic pit props |
| 06/03/1987 | CN86204355U Hydraulic device for making scaffold |
| 05/27/1987 | CN86208278U Combined rack-hydraulic metal support lifter for mine |
| 04/28/1987 | US4660595 Pressure-limiting valve |
| 04/01/1987 | CN86204825U Centre filling type al alloy hydraulic supporting pillar |
| 03/03/1987 | CA1218534A1 Collapsible elongate mine support |
| 02/03/1987 | US4640650 Hydraulically operated unit for roof support |
| 01/13/1987 | CA1216434A1 Elongate mine prop |
| 12/16/1986 | US4628658 Support pack |
| 12/16/1986 | CA1215290A1 Hydraulic control valve for mining jack |
| 09/17/1986 | CN85102494A Concrete flexible frame pillar |
| 08/27/1986 | EP0191919A2 Seal assembly for mine props |
| 08/20/1986 | EP0191570A2 Support member |
| 07/09/1986 | EP0186905A1 Container for filling mine cavities |
| 07/01/1986 | US4597557 Hydraulically-controlled non-return valve |
| 06/04/1986 | CN85202922U Retractable u-type steel prop with multiple swing joints |
| 05/28/1986 | CN85201627U Narrow hydraulic prop |
| 04/16/1986 | CN85202464U Single hydraulically supporting pillar |
| 04/16/1986 | CN85202463U Spun, externally poured, single and hydraulically supporfing pillar |
| 04/16/1986 | CN85202462U Initial jacking force warrant valve |
| 04/08/1986 | US4580594 Valve devices |
| 03/25/1986 | CA1202191A1 Mine support |
| 02/25/1986 | US4572480 Hydraulic prop |
| 01/21/1986 | US4565469 For use in an underground cavity such as a mine |
| 12/24/1985 | US4560305 Yieldable connection |
| 12/10/1985 | US4557488 Hydraulic seal with pressure-actuated ridges |
| 12/10/1985 | CA1197699A1 Mine prop |
| 12/03/1985 | CA1197388A1 Mat pack brick |
| 12/03/1985 | CA1197387A1 Yieldable connection |
| 11/10/1985 | CN85200085U Outer filling single-pole hydraulic prop |
| 11/06/1985 | EP0160133A1 Elongate mine prop |
| 09/10/1985 | US4540065 Apparatus for wall timbering of drifts, tunnels, and the like |
| 08/13/1985 | US4534531 Elongated prop for supporting a load |
| 07/09/1985 | CA1190055A1 Mine prop |
| 06/11/1985 | US4522537 For filling a space to support an underground roof |
| 06/04/1985 | US4520980 Elongate compression bearing member |
| 05/22/1985 | EP0142280A2 Elongate mine support |
| 05/14/1985 | US4516601 For a cylinder of a mine prop |
| 02/05/1985 | US4497597 Cribbing |
| 01/09/1985 | EP0130770A2 Collapsible elongate mine support |
| 12/27/1984 | EP0128964A1 Mine props |
| 09/04/1984 | CA1173674A1 Force transmission device |
| 07/17/1984 | US4460294 Toggle type temporary roof support for mining machinery |
| 07/03/1984 | CA1170066A1 Prop |
| 06/19/1984 | CA1169259A1 Adjustable height mine roadway support stilt |
| 04/03/1984 | CA1164671A1 Mine support prop |
| 02/14/1984 | US4431348 Force transmission device |
| 01/10/1984 | US4425057 Method of mining |
| 12/06/1983 | CA1158226A1 Longwall jacks |
| 09/20/1983 | US4404893 Hydraulic mine prop |
| 05/26/1983 | WO1983001811A1 Hydraulic jack |
| 05/10/1983 | US4382721 Mine roadway support stilt |
| 01/11/1983 | CA1139322A1 Method of mining |
| 01/04/1983 | CA1138662A1 Elongate compression bearing member |
| 12/21/1982 | CA1138018A1 Builders scaffolding |
| 08/17/1982 | US4344354 Valve arrangement for controlling the stroke of a telescoping prop |
| 06/01/1982 | US4332512 Arrangement for erecting columnar supporting elements for underground excavations |
| 04/06/1982 | US4323002 Hydraulic equipment |
| 03/17/1982 | EP0047616A1 Bag for receiving a pumped liquid and method of using it |
| 01/05/1982 | US4309059 Mining method |
| 11/18/1981 | EP0040096A1 Yieldable support element |
| 10/27/1981 | CA1111265A1 Mine roof supports |
| 08/18/1981 | US4284368 Vehicle with dual drill booms and temporary roof support |
| 08/18/1981 | US4284101 Pressure-relief valve devices |
| 08/11/1981 | CA1106734A1 Hydraulic equipment |
| 07/07/1981 | US4277204 Excavation roof support and method of installing the same |
| 06/23/1981 | US4274435 Excess pressure valve particularly for a fluid pressure operated telescopic supporting element employed in underground mining |
| 05/13/1981 | EP0028496A1 Timber prop |
| 05/06/1981 | EP0028124A1 Method of mining |
| 04/28/1981 | CA1100123A1 Water-based industrial fluids |
| 04/14/1981 | CA1099180A1 Pressure-relief valve device |
| 03/24/1981 | US4257902 Dispersions; for use in hydraulic systems, metal shaping operations and underground mining |
| 03/11/1981 | EP0024507A1 Use of a composite material based on aluminium |
| 03/10/1981 | US4255071 Supporting of excavation roofs |