| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 07/14/1999 | EP0824633B1 Prop for use in underground mining or tunnel construction |
| 07/14/1999 | CN2328983Y Tension self ringing electromic digit display convergence instrument |
| 07/13/1999 | US5921718 Prop for use in underground mining or tunnel construction |
| 06/09/1999 | EP0921254A1 A shoring leg |
| 06/09/1999 | CN1043584C Hydraulic support with reversed upright post |
| 05/26/1999 | CN2320787Y Automatic decompression and compensation sealed filling gun |
| 05/19/1999 | CN2319568Y Tunnel support anchoring rod for detecting pressure state |
| 05/19/1999 | CN2319567Y Multi-area sealed piston externally filling single hydraulic prop |
| 05/14/1999 | WO1999023358A1 Cutting machine |
| 05/12/1999 | DE19749275A1 Controlled feed pistol for setting hydraulic props |
| 05/12/1999 | CN2318397Y Internal injection type single hydraulic support |
| 05/05/1999 | CN1215792A Sand pressure release double arch semi-enclosed support technology for soft break rock mining roadway |
| 04/23/1999 | CA2251446A1 Mine prop |
| 03/31/1999 | CN1042761C Hydraulic support for high-dipping stope face |
| 03/10/1999 | EP0695394B1 Support prop |
| 02/25/1999 | WO1999009299A1 Pillar bag support |
| 02/18/1999 | WO1999007980A1 A pre-stressing device for a mine prop |
| 02/17/1999 | CN1208118A Hydraulic prop obliquity monitor |
| 02/10/1999 | CN1207450A 单体液压支柱 Hydraulic prop |
| 02/09/1999 | US5868527 Mine props |
| 01/20/1999 | CN2304751Y Monitor for incline of hydraulic props |
| 01/20/1999 | CN2304750Y Monoblock hydraulic prop |
| 12/23/1998 | CN2301536Y Prop shoe |
| 12/23/1998 | CN2301535Y Hydraulic prop |
| 11/12/1998 | WO1998050683A1 Yieldable mine roof support |
| 10/21/1998 | CN2295047Y Fastening device for H-shaped steel supporting shed of mine |
| 10/20/1998 | US5823718 Pillar bag |
| 10/14/1998 | CN1195739A Solid angle plate structure method for assembling coal mine underground support frame with tyre |
| 10/13/1998 | CA2152802C Yieldable confined core mine roof support |
| 10/07/1998 | CN2293646Y Hydraulic prop antifalling locking device |
| 09/23/1998 | EP0674597B1 Pressure pad, in particular for filling mining cavities |
| 09/09/1998 | CN2290696Y Single prop automatic recording meter |
| 09/09/1998 | CN2290695Y High height lifting single hydraulic prop |
| 08/26/1998 | CN2289055Y Mine single body hydraulic prop sealing ring |
| 06/18/1998 | DE19647943C1 Hydraulischer Doppelteleskopstempel Hydraulic double telescopic ram |
| 06/17/1998 | CN1185193A Prop for used in underground mining or tunnel construction |
| 06/03/1998 | CN1183508A Compression supporting of soft rock road (tunnel) using wings based on cyclone theory |
| 05/28/1998 | WO1998022695A1 Hydraulic double telescopic prop |
| 05/20/1998 | CN2282069Y Temporay support pillar for mounting top plate anchor rod |
| 05/12/1998 | CA2045274C Prop preloading apparatus |
| 05/05/1998 | US5746547 Mine support cribs |
| 04/22/1998 | CN2279444Y Emulsion automatic proportioning instrument |
| 04/15/1998 | CN2278771Y Single hydraulic prop fall preventing device for working face |
| 04/08/1998 | CN2278082Y Automatic spraying dust removing device of single signal self-locking hydraulic support frame |
| 04/01/1998 | CN2277454Y Assembling machine for single hydraulic prop |
| 03/18/1998 | CN2276560Y Mine metallic support anti-falling apparatus |
| 03/11/1998 | CN2276077Y Make-up fluid booster |
| 02/25/1998 | EP0824633A1 Prop for use in underground mining or tunnel construction |
| 02/24/1998 | US5720581 Support prop |
| 02/11/1998 | CN1172892A Single machinery prop |
| 01/29/1998 | DE19705713A1 Fabric pillar bag for foundations |
| 01/25/1998 | CA2198808A1 Pillar bag |
| 01/22/1998 | DE19629182A1 Pressure cushion for underground construction work |
| 01/21/1998 | CN2272946Y Oil cylinder after restoration of single hydraulic prop |
| 12/31/1997 | CN2271612Y 单体液压支柱 Hydraulic prop |
| 12/24/1997 | CN2271194Y Screw cam-type u-shaped steel chock |
| 12/24/1997 | CN1036801C 单体支柱 Prop |
| 12/18/1997 | WO1997047859A1 Inflatable mine support |
| 11/04/1997 | US5683182 High pressure bag |
| 10/29/1997 | CN2266042Y Hydraulic chock running valve |
| 10/22/1997 | CN2265434Y Reciprocative drawing type hydraulic drawing-pole device |
| 09/23/1997 | US5669739 Prestressing of mine props |
| 09/16/1997 | US5668325 In an underground excavation |
| 09/11/1997 | DE19608940A1 Rapid means of producing underground mining structures e.g. pillars, walls, gob packs, road buttresses and sumps |
| 09/10/1997 | CN2262099Y Top Contact type moving frame valve |
| 08/20/1997 | CN1157367A Light low-level hydraulic prop for caving coal-mining method |
| 08/19/1997 | US5658099 For supporting an inflatable grout bag |
| 08/13/1997 | CN2259488Y Combined tyre tool for repairing valve sleeve |
| 08/13/1997 | CN2259487Y Three-fork type hydraulic prop |
| 07/30/1997 | CN2258535Y High-strength three-purpose valve |
| 06/03/1997 | US5634721 High pressure bag |
| 04/30/1997 | CN2253392Y 单体液压支柱 Hydraulic prop |
| 04/09/1997 | CN2251619Y Multifunctional leading chock for drift |
| 04/01/1997 | US5615979 Mine support bag |
| 03/26/1997 | CN1145977A Prestressing of mine props |
| 03/18/1997 | US5611646 Support prop with integrated pressure limiting valve and nailed pipes |
| 02/26/1997 | CN2248245Y New-type underground supporting structure with tyres for coal mine |
| 02/24/1997 | CA2156798A1 Mine support bag |
| 02/19/1997 | CN2247721Y Light single hydraulic prop for blasting mining |
| 02/05/1997 | CN2246711Y Step-by-step hydraulic prop drawer |
| 01/15/1997 | CN2245119Y Bamboo wood fiber compound pad pier |
| 01/08/1997 | CN2244616Y Fall preventing device for double T-steel chock for miners |
| 01/08/1997 | CN2244615Y Fall preventing device for steel chock for miners |
| 01/06/1997 | CA2168077A1 Prestressing of mine props |
| 12/07/1996 | CA2178383A1 Headboard |
| 12/05/1996 | DE19527477C1 Valve for steel hollow body telescoped by being filled with building material |
| 11/20/1996 | CN2240607Y hydraulic prop for blasting down the roof coal |
| 11/13/1996 | CN2240044Y Single hydraulic prop with composite member |
| 11/06/1996 | CN2239504Y Mine post shoes |
| 11/06/1996 | CN2239503Y Side-passage liquid control one-way valve |
| 10/30/1996 | CN2238909Y Hand rotating valve two-purpose pressure topping-up gun |
| 10/24/1996 | WO1996033336A1 Prop for use in underground mining or tunnel construction |
| 10/24/1996 | DE19514137A1 Ausbaustütze für den untertägigen Berg- oder Tunnelbau A support for the underground mining or tunneling |
| 10/16/1996 | CN2237719Y Single hydraulic prop without maintaining |
| 10/15/1996 | US5564867 Resilienty compressible support column for use in a mine |
| 09/25/1996 | EP0667931B1 Piston-cylinder unit and process for making it |
| 09/18/1996 | CN2235504Y Composite material ladder-shaped chock for mining use |
| 09/18/1996 | CN2235502Y Hydraulic supporting automatic spraying dust eliminating apparatus |
| 09/11/1996 | CN2235019Y External injected single-boby hydraulic supporting column |
| 09/11/1996 | CN1032774C Hydraulic support of steelwork mine |