| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 02/19/1992 | CN2096641U Single hydraulic prop |
| 02/19/1992 | CN2096501U Special-purpose transport mine car |
| 02/12/1992 | CN2095937U Two half iron bar shoe |
| 02/12/1992 | CN2095936U Mechanical hydraulic support for top coal releasing |
| 02/12/1992 | CN2095935U H-bar dual direction retractive lane support wedge joint |
| 02/12/1992 | CN1058553A Method for manufacturing piston working cylinder member and piston working cylinder member manufactured thereby |
| 02/06/1992 | WO1992001858A1 Multi-height hydraulic pit prop |
| 01/22/1992 | CN2093901U Reinforcer for underground excavation working-face props |
| 01/08/1992 | CN2092603U Single body hydraulic props using under the situation of large excavating height |
| 01/08/1992 | CN2092602U Single-body hydraulic props with no head |
| 01/08/1992 | CN2092601U Hydraulic props with the feature of step-take sustaining and shielding |
| 01/02/1992 | DE4035874A1 Underground-mine walling ram - has head forming safety-valve-spring housing with outlet in wall or top |
| 01/01/1992 | CN2091949U Valve remover |
| 12/11/1991 | CN2090419U Three-beam and waste rock bumping structure combined light hydraulic prop |
| 11/28/1991 | WO1991018187A1 Process for manufacturing a piston-cylinder unit and a piston-cylinder unit manufactured by said process |
| 11/28/1991 | WO1991018186A1 Hydraulic steel pit prop |
| 11/27/1991 | CN2089527U Double ear single body hydraulic pillar |
| 11/22/1991 | CA2017314A1 Yieldable mine post |
| 11/20/1991 | CN1056335A Three-purpose safety valve |
| 11/14/1991 | DE4015084A1 Verfahren zur herstellung einer kolben-zylinder-einheit sowie kolben-zylinder-einheit hergestellt nach dem verfahren Procedural method for manufacturing a piston-cylinder-piston unit and-cylinder-unit produced by the |
| 11/13/1991 | CN2088600U Mining field roof plate support and protect device |
| 11/13/1991 | CN2088598U Safety three-purpose valve |
| 11/13/1991 | CN2088597U Hydraulic jack sealing device for coal mine underground shaft |
| 11/13/1991 | CN2088596U Suspended moving roof beam hydraulic support |
| 11/06/1991 | CN2088246U Pressure gauge for hydraulic prop in the coal mine |
| 10/30/1991 | CN2087689U Single-body hydraulic prop anti-collapse and anti-ejection column cap |
| 10/16/1991 | CN2086795U Combined elongation of single hydraulic prop |
| 10/09/1991 | CN2086302U Control valve for hydraulic support |
| 09/25/1991 | CN2085416U Nylon prop shoe |
| 09/25/1991 | CN2085415U Hydraulic control check valve |
| 09/24/1991 | US5051039 Hydraulic steel mine prop |
| 09/18/1991 | CN2084982U Topping-up gun with pressure-maintaining interlock device |
| 09/18/1991 | CN2084981U Pi-shaped trapezoidal supporter telescopic in two way |
| 09/11/1991 | CN2084517U Self-control fluid injector |
| 09/11/1991 | CN2084516U Secondary prepressing type pressure measuring instrument |
| 09/11/1991 | CN2084515U Guide plunger hydraulic strut |
| 08/28/1991 | CN2083632U Mineral three-purpose valve protector |
| 08/28/1991 | CN2083631U Mineral single body hydraulic support three-purpose valve |
| 08/28/1991 | CN2083630U Mineral hydraulic test table |
| 08/22/1991 | DE4005126A1 Permanent lining unit to be used alone or with other supports - consists of webbing or plastics sleeve double seam at ends and filled with building material |
| 08/21/1991 | CN2083193U Internal circulation, external loading single-body hydraulic prop |
| 08/14/1991 | CN2082761U Hydraulic prop working resistance monitor |
| 08/08/1991 | DE4003465A1 Pressure relief valve for hydraulic pip-prop - has gas spring to hold valve piston on its seat |
| 07/31/1991 | CN1053470A Hydraulic props |
| 06/26/1991 | CN2079658U Monoblock porp shoe |
| 06/25/1991 | US5026218 Temporary roof support cylinder |
| 06/20/1991 | DE4005983A1 Support for insertion in voids in mine - comprises fabric bag filled under pressure with fibre-reinforced cement material which then hardens |
| 06/12/1991 | CN2078805U Cap-setting machine |
| 06/12/1991 | CN2078804U Initial supportability safety valve for hydraulic prop |
| 06/12/1991 | CN2078803U Multifunctional pressure tube with digital display |
| 06/12/1991 | CN2078802U Hydraulic sliding support for telescopic caps |
| 06/12/1991 | CN2078801U Temporary support |
| 06/05/1991 | CN2078372U Indicating value style liquid injecting gun |
| 06/05/1991 | CN2078371U Simple support for long beam |
| 06/05/1991 | CN1051960A Horizontal three plunger pump with forerumming type hydraulic controlled inside unloading |
| 05/22/1991 | CN1051608A Telescopic props for building materials |
| 05/15/1991 | CN2077025U Couple device between hydraulic valves |
| 05/15/1991 | CN2077024U Bidirectional expansion en-block hydraulic supported pillar |
| 05/14/1991 | US5015125 Yieldable mine post |
| 05/08/1991 | CN2076602U Individual prop cap |
| 05/02/1991 | DE3935188A1 Hydraulic pit prop setting pistol - incorporates valve controlling prop retraction and also controls return flow of hydraulic fluid to tank |
| 05/02/1991 | DE3935187A1 Hydraulic pit prop control value - has piston with three sets of holes for check blocking and pressure limiting valves |
| 05/01/1991 | CN2076159U Hydraulic support substituting for shed |
| 05/01/1991 | CN2076158U Walking hydraulic support |
| 05/01/1991 | CN2076157U Double telescopical prop with two stage cylinders and high initial support force |
| 05/01/1991 | CN2076156U Hydraulic prop net-laying apparatus |
| 04/17/1991 | CN2075257U Liquid filling gun with pressure display |
| 04/17/1991 | CN1050753A Hydraulic steel props for mine |
| 04/03/1991 | CN2074363U Three-purpose relief valve |
| 04/03/1991 | CN2074362U Mine sliding hydraulic prop |
| 03/06/1991 | CN2072591U Mine single hydraulic pit prop piston dismounting tool |
| 03/06/1991 | CN2072590U Repairing device for hydraulic pit prop (frame) cylinder body and moving pillar |
| 03/06/1991 | CN1049699A Safety display device for single hydraulic prop |
| 02/21/1991 | WO1990014499A3 Flexible telescopic prop for building materials |
| 02/20/1991 | CN2071706U Monobloc combination type self-moving end support |
| 02/13/1991 | CN2071249U Liquid control slide top beam hydraulic support |
| 02/13/1991 | CN1011605B Hydraulic prop for moving suspended top beam |
| 02/07/1991 | DE3919841A1 Vertical support between floor and roof of mining gallery - comprises collapsible rectangular frame covered with fabric bag to hold hardening material |
| 02/06/1991 | CN2070822U Prop shoe for mine |
| 01/16/1991 | CN2069481U Net-coupling type hydraulic supporting frame |
| 01/16/1991 | CN1048580A Telescopic flexible metal shield |
| 01/10/1991 | WO1991000416A1 Hydraulic stand |
| 01/08/1991 | US4983077 Method and an apparatus for producing fabric-reinforced lining supports or slender supporting structural units |
| 01/02/1991 | CN2068583U Movable hydraulic chock moving along roof |
| 12/26/1990 | CN2068148U Single-body combined self-moving support |
| 12/19/1990 | CN2067753U Light hydraulic prop for mining with gun |
| 12/13/1990 | DE4009632A1 Support for long term securing mining areas |
| 12/05/1990 | CN2066891U Mine single prop end |
| 12/01/1990 | WO1990015224A1 Load support |
| 12/01/1990 | CA2056368A1 Load support |
| 11/29/1990 | DE3917170A1 Roof support in mining - comprises webbed container surrounding mesh frame filled with hardening material |
| 11/28/1990 | EP0399369A2 Device for supporting intermediate roofs in the mining level of ore veins |
| 11/28/1990 | CN2066491U Tri-purpose relief valve |
| 11/28/1990 | CN2066490U H shape steel arch hinge telescopic support for mine |
| 11/22/1990 | DE3915837A1 Plastic-filled telescopic prod. - with plastic bands joining inner and outer steel tube |
| 11/17/1990 | WO1990014499A2 Flexible telescopic prop for building materials |
| 11/17/1990 | CA2057922A1 Flexible telescopic prop for building materials |
| 10/17/1990 | CN2063976U Priming gun with primitive bracing force controller |
| 09/26/1990 | CN2062762U Filling liquid gun with pressure display |
| 09/16/1990 | CA2012302A1 Yielding mine prop |