| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 09/05/1990 | CN2061608U Mining prop with elastic base |
| 09/05/1990 | CN2061607U Sliding member of bi-directional telescopic i steel beam ladder prob for mine |
| 08/22/1990 | CN2060814U Topping-up device with press showing function |
| 08/15/1990 | CN2060476U High strength clamping cable made of u-type steel |
| 08/15/1990 | CN2060475U Mine single hydraulic prop |
| 07/25/1990 | CN2059680U Three-purpose valve for high flow manometry |
| 06/06/1990 | CN2057955U Safety column fastener |
| 06/06/1990 | CN2057954U U-type steel support mat |
| 06/06/1990 | CN2057920U Lifting/pile puller of non-reversing chain |
| 05/16/1990 | CN2057213U Lacing wire type supporting airpocket |
| 05/10/1990 | DE3837982A1 Pressure-relief valve for hydraulic support systems, in particular for use as a rock-burst valve |
| 05/09/1990 | CN2056940U Light, flexible, cross prop cap |
| 04/18/1990 | CN2056192U Net support shield of coal recovery face |
| 04/10/1990 | US4915339 Mine prop |
| 04/04/1990 | CN2055538U Double seal rings piston and base frmae |
| 04/04/1990 | CN2055537U Reducable i-steel support |
| 03/29/1990 | DE3904644C1 Hydraulic pit prop |
| 03/28/1990 | CN2055185U Folded pile shoes used in coal mine |
| 03/28/1990 | CN2055184U Self-lifting type hydraulic support column |
| 03/07/1990 | CN2054076U Sliding hydraulic prop for mine cap |
| 02/14/1990 | CN1039638A Hydraulic prop for moving suspended top beam |
| 02/01/1990 | DE3841543A1 Method and arrangement for constructing a lining support, in particular in mining and tunnelling |
| 01/31/1990 | CN2052041U Leak detector for hydraulic single prop |
| 01/24/1990 | CN2051671U Nylon supporting shoes of mine supports |
| 01/11/1990 | WO1990000217A1 Hydraulic steel mine-prop |
| 01/10/1990 | EP0349942A1 Hydraulic steel prop |
| 12/27/1989 | CN2050071U Contant resistance friction metal strut and mating tool |
| 12/20/1989 | CN2049677U Alloy protective coated moving prop cylinder of single hydraulic prop |
| 12/20/1989 | CN1006164B Frame concrete pillar |
| 12/06/1989 | CN2048896U Monomer hydraulic pillar |
| 12/05/1989 | USRE33124 Oil-soluble sulfur- or chlorosulfur-containing additive in stable aqueous dispersion with polymeric thickener; extreme pressure lubricants |
| 11/15/1989 | CN2047720U Liquid filling gun with constant pressure |
| 11/15/1989 | CN2047719U Supporting prop with elastic protection layer |
| 11/08/1989 | CN2047305U Light versatile reusable prop-shoe and prop-cap |
| 11/08/1989 | CN2047304U Roof-tangential prop setting toppling-proof and skid-proof device for mine |
| 10/12/1989 | DE3803245C1 Prop connecting clamp |
| 10/04/1989 | CN2045427U Safety top cover for en-block prop setting |
| 09/27/1989 | CN1035866A Contractible and suspended struture supporting method |
| 09/14/1989 | DE3806883A1 Rock-burst valve |
| 08/23/1989 | CN2043274U New type coupling piece for t-steel retractable tunnel supporting frame |
| 08/23/1989 | CN2043273U Coreless safety valve |
| 08/16/1989 | CN1034781A Pressure limited valve with dry chamber including spring |
| 08/03/1989 | DE3900395A1 Hydraulischer arbeitszylinder, insbesondere im bergbau einsetzbarer hydraulischer tragstempel Hydraulic cylinders, particularly in the mining-purpose hydraulic contract temple |
| 07/27/1989 | DE3801604A1 Swing-in and mobile face-margin supporting unit |
| 07/06/1989 | DE3744085A1 Hydraulic multiple telescopic cylinder |
| 07/05/1989 | CN2040538U Three purpose valve |
| 07/05/1989 | CN2040537U Middle part liquid-injection type aluminium alloy single hydraulic strut |
| 07/05/1989 | CN2040536U Single hydraulic strut |
| 07/05/1989 | CN2040535U Magnesite concrete strut |
| 06/28/1989 | CN2040142U Single-body hydraulic support |
| 04/19/1989 | CN2036207U Blast-proof outer injection en-block hydraulic column |
| 03/22/1989 | CN2034617U Mono-strut shoe made with glass fibre reinforced plastic |
| 03/09/1989 | DE3732894A1 Method and arrangement for producing fabric-reinforced supports or slim, load-bearing construction members |
| 03/08/1989 | CN2033857U Suspensory displaceable hydraulic prop for headbeam |
| 03/01/1989 | CN2033445U Piston type single hydraulic cylinder |
| 02/15/1989 | CN2032653U Three-purpose high pressure valve |
| 02/08/1989 | CN1030904A Flexible concrete spray coating support protection material |
| 01/31/1989 | CA1249447A1 Mining support pillars |
| 01/26/1989 | DE3723634A1 Method and apparatus for the non-polluting removal of the water mixed with oil from individual hydraulic props |
| 01/18/1989 | CN2031036U Half-load step-following type portable hydraulic support frame |
| 01/11/1989 | CN2030654U Hydraulic trestle with sliding mine cap |
| 12/28/1988 | CN88219731U Cap of top-cutting strut |
| 12/28/1988 | CA1247384A Support member |
| 11/30/1988 | CN88210953U Special topping strut for thin coal seam |
| 11/30/1988 | CN88202603U Mine strut iron shoes |
| 11/16/1988 | CN87212485U Hydraulic valve with impulse-bearing ring |
| 11/09/1988 | CN88201380U Hydraulic prop coated with enamel |
| 10/19/1988 | CN88203239U New four-bar-linkage force transmission unit with hydraulic stand |
| 10/12/1988 | CN87216875U Prop shoe for mining |
| 09/21/1988 | CN88210900U Anti-landslide column clamp for en-block hydraulic prop |
| 09/21/1988 | CN88203505U 新型单体液压支柱 The new hydraulic prop |
| 09/21/1988 | CN87212486U Initial self-supporting force self-protecting mechanism of reversal valve |
| 09/13/1988 | US4770564 Mining support pillars |
| 09/13/1988 | US4770085 Hydraulic jack |
| 09/07/1988 | CN88203818U Sliding hydraulic prop with double carrying bar |
| 09/07/1988 | CN87206969U Soft-jointed collapse-proof and slide-proof device for tangential roof supporters |
| 08/31/1988 | CN88210810U Folding bottom shoe for single-body prop |
| 08/17/1988 | CN87205395U Roof-cutting prop with anti-fall & anti-skid device |
| 07/27/1988 | CN87213791U Four joint rod hydraulic support frame |
| 07/20/1988 | CN87216389U Retractable arch with high strength |
| 07/06/1988 | CN86209751U Plunger hydraulic pit prop |
| 06/22/1988 | CN87207770U Initial stay force assurance valve |
| 06/14/1988 | CA1237905A1 Ice crib |
| 05/18/1988 | CN87204554U Hydraulic support with retractable top beam |
| 05/18/1988 | CN86104371A High single-column roof-support with a tangential adjusting movement |
| 05/04/1988 | CN87210120U Topping-up gun for support column in mine |
| 05/03/1988 | CA1235912A1 Cribbing |
| 04/13/1988 | CN87206338U Three-purpose valve with throttle discharging |
| 03/30/1988 | CN87206159U Single arch type metallic cap |
| 03/16/1988 | CN87106078A Slit anchor mounting tool |
| 03/09/1988 | CN87207098U Telescopic joist chock |
| 02/24/1988 | CN87201517U Portable shed-erecting machine |
| 02/24/1988 | CN87201481U Anti-collapse unit for cutting top prop of slow inclined moderate thickness coal seam |
| 02/23/1988 | US4726714 Self adjusting structure support |
| 02/10/1988 | CN86209551U Elevating flatform for bracing and installing |
| 02/10/1988 | CN86207491U Resistance-enlarging-type foldable friction prop |
| 02/10/1988 | CN86200446U Great-altitude top bracing prop with two columns and riders |
| 01/28/1988 | DE3624926A1 Multi-component container |
| 01/27/1988 | CN87201482U Sliding and toppling prevention device for high type roof fitting pit prop |
| 01/26/1988 | CA1231843A1 Elongate mine support |