| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 09/10/1996 | CA2092150C Mine roof support system |
| 08/20/1996 | US5547317 Mine support system |
| 08/14/1996 | CN2232980Y Support unit of underground tunnel |
| 08/07/1996 | CN1128322A Hydraulic support for high-dipping stope face |
| 08/01/1996 | DE19502518A1 Pressure relief valve |
| 07/23/1996 | US5538364 Yieldable mine post having a double ball and socket configuration |
| 07/17/1996 | CN1126794A 单体支柱 Prop |
| 07/10/1996 | CN2230814Y Hydraulic support for coal mining by cover caving process |
| 07/10/1996 | CN1032268C Simple integrative mining hydraulic support |
| 07/03/1996 | CN2230351Y Fully-hydraulic pillar-dismantling machine |
| 06/26/1996 | CN2229971Y Falling down proof device for linking supporting-racks |
| 02/29/1996 | DE4430552A1 Walling equipment for underground mining |
| 02/29/1996 | DE19503071A1 Telescopic prop |
| 02/15/1996 | DE4428532A1 Structural support for use in mining industry |
| 02/14/1996 | CN1116684A A high pressure bag |
| 02/07/1996 | EP0695394A1 Support prop |
| 02/07/1996 | CN2219375Y Monomer prop |
| 01/31/1996 | CN2218828Y Height regulating anti-drop single hydraulic prop |
| 01/17/1996 | CN2217683Y Telescopic anchor rod |
| 01/16/1996 | US5484130 Support column for use in a mine |
| 12/27/1995 | CN1113995A Liquid injection pile pressure detecting instrument |
| 12/21/1995 | WO1995034743A1 Mine prop |
| 12/21/1995 | DE4440424C1 Method of supporting saw notches during production of stone blocks |
| 12/13/1995 | CN2215023Y Hydraulic prop for chuting top coal |
| 11/29/1995 | CN2213848Y Low-position caving hydraulic support for coal mine |
| 11/29/1995 | CN2213847Y Front support of tunnel trapezoidal |
| 11/22/1995 | CN1112369A Lining prop with an integrated pressure relief valve and nailed pipes |
| 10/31/1995 | US5462076 Pressure-compensated pressure limiting valve |
| 10/25/1995 | CN2210953Y Hydraulic prop |
| 10/25/1995 | CN2210952Y Double H-iron arch telescopic-prop for mining use |
| 10/04/1995 | EP0674597A1 Pressure pad, in particular for filling mining cavities |
| 10/03/1995 | US5454866 Grout composition |
| 10/03/1995 | US5454669 Yield valve |
| 09/18/1995 | CA2144612A1 High pressure bag |
| 09/13/1995 | CN1108351A Method for withdrawing prop and the tools used therefor |
| 08/31/1995 | DE4406544A1 Ram for prop and roadway support for underground mining and tunnelling |
| 08/30/1995 | CN2206353Y Anti-fall device for single hydraulic prop |
| 08/30/1995 | CN2206352Y Hydraulic chock with reversal upright column |
| 08/23/1995 | CN1029572C High pressure hydraulic valve |
| 08/09/1995 | CN2204856Y Pulling and supporting pillars of U-shape support and backtimber |
| 08/08/1995 | US5439325 Variable yielding mining crib support column |
| 08/03/1995 | DE4402358A1 Stacking pot pillar for mining supports |
| 08/02/1995 | CN2204333Y Column-shoe for mining single-body hydraulic prop |
| 08/02/1995 | CN1106104A Hydraulic support with reversed upright post |
| 07/27/1995 | DE4441778A1 Support ram for tunnelling applications |
| 07/27/1995 | DE4401480A1 Mine support prop with integral pressure limiting value sleeve |
| 07/26/1995 | CN2204001Y Liquid withdrawing gun for external injection type single hydraulic prop |
| 07/25/1995 | US5435670 Spacer assembly and method |
| 07/14/1995 | CA2140121A1 Support prop assemblies |
| 07/12/1995 | CN2203359Y High-level caving coal hydraulic prop |
| 07/12/1995 | CN2203358Y High-level caving coal hydraulic prop |
| 07/12/1995 | CN1105097A Hydraulic single props with valve for filling and withdrawing from chocks and unit for flowing back of pressure liquid |
| 06/27/1995 | US5427476 Mine prop headboard |
| 06/14/1995 | CN2200693Y Three-purpose valve for hydraulic column headpiece |
| 06/14/1995 | CN1028889C Telescopic props for building materials |
| 05/31/1995 | CN2199309Y Self-distributing oil water emulsion pump set |
| 05/17/1995 | CN2197459Y Portable hydraulic apparatus for pillar extraction |
| 05/11/1995 | DE4338830C1 Support which is compliant under the influence of a load to be absorbed and is intended for use in underground chambers |
| 05/09/1995 | US5413436 Support column |
| 04/26/1995 | CN2195618Y Special chock for galleries |
| 04/26/1995 | CN2195617Y Pressure digital-displaying single-body hydraulic prop |
| 04/05/1995 | CN2193922Y Pillar boots |
| 03/28/1995 | US5400994 Yieldable roof support system |
| 03/25/1995 | CA2132785A1 Prop headboard |
| 03/15/1995 | CN2191923Y Pressure gage for chock |
| 03/01/1995 | CN2190695Y Plunger type single hydraulic prop |
| 03/01/1995 | CN1099457A Rigid yielding prob for tunnel in expansion rock stratum |
| 02/10/1995 | CA2103624A1 Spacer assembly and method |
| 02/01/1995 | CN1098164A Pressurized prop pressure detector |
| 01/26/1995 | WO1995002748A1 Lining prop with an integrated pressure relief valve and nailed pipes |
| 01/26/1995 | DE4338831C1 Yielding support for use in underground spaces |
| 01/26/1995 | CA2142467A1 Pit prop with integrated pressure-relief valve and nailed pipes |
| 01/18/1995 | CN2187677Y Single body hydraulic prop beam clamping device |
| 01/18/1995 | CN2187676Y Fixing device for under ground frame |
| 01/12/1995 | WO1995001498A1 Filling and recovery valve with fluid return |
| 01/11/1995 | CN2187226Y Extensible section of steel chock |
| 01/04/1995 | CN1027300C Adjustable hydraulic supporting frame |
| 12/21/1994 | EP0629802A1 Compensated pressure control valve |
| 12/21/1994 | CN2185795Y Combination frame flexible shield prop device |
| 12/21/1994 | CN2185794Y Mining I-steel chock with adjustable strengthening device |
| 12/14/1994 | CN2185324Y Compensated pressure gauge |
| 12/07/1994 | CN2184783Y Outer injection hydraulic prop lifting device |
| 12/07/1994 | CN2184782Y Outer injection single hydraulic prop |
| 12/07/1994 | CN1026911C Bamboo chock for mine |
| 11/30/1994 | CN2184085Y Individual hydraulic prop |
| 11/29/1994 | CA2097259A1 Hydraulic prop having a filling valve and a clearing valve and with hydraulic fluid return |
| 11/24/1994 | WO1994027029A1 Support prop |
| 11/23/1994 | CN1095456A Manufacture of unit of cylinder of piston and piston cylinder produced with same |
| 11/16/1994 | CN2182880Y Means for supporting and keeping gallery |
| 11/02/1994 | CN2181568Y Mining hydraulic roof supporting and replacing machine for step-by-step movement |
| 11/02/1994 | CN2181567Y Automatic booster |
| 11/02/1994 | CN2181566Y Telescopic chain |
| 10/26/1994 | CN2180782Y Strong fall-proof device for single body hydraulic support post |
| 10/12/1994 | CN2179462Y Anchor-drawing support |
| 10/05/1994 | CN1093141A High pressure priming gun for single hydraulic prop |
| 09/29/1994 | WO1994021890A1 Yieldable confined core mine roof support |
| 09/28/1994 | CN2178280Y Single hydraulic prop head assembly extensible device |
| 09/28/1994 | CN2178279Y Hydraulic support |
| 09/21/1994 | EP0491882B1 Multi-height hydraulic pit prop |
| 09/20/1994 | US5348425 Piston cylinder device with a protective coating and method of producing such a coating |