| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 05/16/1989 | CA1254047A1 Method and a device for guiding a concrete feeding hose in connection with the grout feed in rock bolting |
| 05/16/1989 | CA1254046A1 Method of and a device for carrying out wire bolting |
| 05/02/1989 | US4826358 Device for anchoring in and/or reinforcing hard materials |
| 04/26/1989 | CN2036572U Small-diameter seamed pipe anchoring-bolt |
| 04/20/1989 | WO1989003518A1 Measuring device useful for identifying anchorage loads |
| 04/12/1989 | CN2035794U Anchor rod with pair wedges |
| 03/14/1989 | CA1251067A1 Rockbolt |
| 03/01/1989 | CN2033446U Pipe gap friction expanding joint of anchor arm |
| 02/21/1989 | CA1250162A1 Mine wall support anchor |
| 02/15/1989 | EP0303551A1 Double action anchor |
| 02/02/1989 | DE3726645C1 Anchor device for rock stabilising |
| 01/17/1989 | US4798501 Flexible rock anchor |
| 01/10/1989 | CA1248373A1 Expansion sleeve and anchorage device incorporating the sleeve |
| 01/03/1989 | CA1247892A1 Dynamic rock stabilizing fixture |
| 12/13/1988 | US4790129 Ground control |
| 12/06/1988 | US4789284 Self-cutting expansion anchor |
| 12/01/1988 | DE3717024A1 Device for drilling boreholes and injecting stabilising material |
| 11/29/1988 | CA1245486A1 Tubular expansion bolt |
| 11/16/1988 | CN87211329U Bamboo anchoring-bolt for anchoring tunnel, and its accessories |
| 11/15/1988 | US4784531 For use in a mine to support a mine roof |
| 11/15/1988 | US4784530 Roof bolt apparatus |
| 11/08/1988 | CA1244270A1 Friction washer for securing a wire mesh screening onto the protruding end of rock bolts |
| 11/02/1988 | CN88202998U Automatic immersion cement roof bolt |
| 10/25/1988 | CA1243516A1 Method and apparatus for combining resin bonding and mechanical anchoring of a bolt in a rock formation |
| 10/19/1988 | CN88210250U Steel-wire rockbolt |
| 09/15/1988 | DE3707036A1 Fastening system consisting of a drillhole and of a rock tie fastenable in this |
| 09/07/1988 | EP0280705A1 Process and device for producing drilling holes from an angled position in relation to the drilling axes. |
| 09/07/1988 | CN87211250U H-shaped telescopic anchor pin |
| 08/17/1988 | EP0278172A1 Anchoring |
| 08/16/1988 | US4764055 Resin reinforced expansion anchor system |
| 08/16/1988 | CA1240541A1 Combination expansion shell and resin secured mine roof anchor assembly |
| 07/20/1988 | EP0274719A2 Thread-forming method and tubular body provided with a thread |
| 07/13/1988 | EP0274166A1 Reinforcement bar centering device |
| 06/30/1988 | DE3643522A1 Expansion anchor head for tie rods for use in anchor support systems in mining, and also in tunnel and gallery workings |
| 06/28/1988 | US4753559 Expansion shell |
| 06/22/1988 | EP0272233A1 Method of stabilizing a rock structure and stabilizer therefor |
| 06/16/1988 | WO1988004355A1 Roof bolt anchor |
| 06/14/1988 | US4750887 Anchor bolt assembly |
| 06/07/1988 | CA1237593A1 Ground control |
| 05/24/1988 | US4746248 Anchor bolt assembly |
| 05/17/1988 | US4744699 To drill a bore in the roof of a mine |
| 04/28/1988 | DE3631653C1 Anchorage for a rock bolt |
| 04/27/1988 | EP0265283A1 Improved rock bolt |
| 04/26/1988 | US4740111 Friction washer for securing a wire mesh screening onto the protruding end of rock bolts |
| 04/20/1988 | EP0263819A1 Device for anchoring in and/or reinforcing hard materials. |
| 04/14/1988 | DE3634095A1 Method and apparatus for stabilising friable rock formations in the head area of the face in underground mining |
| 04/13/1988 | EP0263803A1 Process and device for anchoring under tension |
| 04/12/1988 | USRE32645 Dynamic rock stabilizing fixture |
| 04/07/1988 | WO1988002437A1 Earth strata bolts or anchorages |
| 03/30/1988 | CN87202495U All set anchor pole for supporting tunnel |
| 03/24/1988 | WO1988002058A1 Rock anchor |
| 03/24/1988 | WO1988002057A1 Combined rigid profiled and expanding anchor |
| 03/16/1988 | EP0259755A1 Rock anchoring bolt |
| 03/16/1988 | CN87206290U Force measurer for measuring the anchor bolts |
| 03/10/1988 | WO1988001677A1 Process and device for producing drilling holes from an angled position in relation to the drilling axes |
| 03/09/1988 | EP0259021A1 Anchor bolt assembly |
| 03/09/1988 | CN87207128U Tubular friction tension anchoring-bolt |
| 03/08/1988 | US4729696 Cartridge for use in fixing an anchor bolt and a method |
| 03/02/1988 | EP0257645A1 Flexible rock anchor |
| 03/02/1988 | CN87207582U Drivepipe-lifting inherent-stress slip anchor block for condensed-oil steam-injection well |
| 02/24/1988 | CN87105613A Anchor bolt assembly |
| 02/16/1988 | US4725096 Method of and a device for carrying out wire bolting |
| 02/10/1988 | CN87105367A Reinforcing method and means |
| 02/03/1988 | EP0255392A1 Reinforcing method and means |
| 02/03/1988 | CN87207154U Extension adjustable anchor bar with expanding shell |
| 01/27/1988 | EP0254056A1 Longitudinally elongated racks with holding clamps for removably mounting circuit boards |
| 01/07/1988 | EP0251887A1 Extensible support bolt, supporting method, use of the bolt |
| 12/31/1987 | CN87202281U Extrusion type extendible anchor rod |
| 12/02/1987 | EP0247778A1 Single-pass roof bolt and apparatus and method for installation |
| 12/02/1987 | EP0116599B1 Expansion sleeve and anchorage device incorporating the sleeve |
| 11/25/1987 | CN87200415U Recoverable pipe cone type anchor stem |
| 11/24/1987 | US4708559 Reinforcing washer for a mine roof bolt assembly |
| 11/24/1987 | US4708533 Method and a device for guiding a concrete feeding hose in connection with the grout feed in rock bolting |
| 11/18/1987 | CN86208821U Telescopic type anchor rod |
| 11/17/1987 | CA1229232A1 Rock bolt system |
| 11/04/1987 | CN87206402U Steel wire rope anchor bar |
| 11/03/1987 | US4704053 Versatile roof bolt assembly |
| 11/03/1987 | US4703711 Load-indicating devices |
| 10/31/1987 | CN86209913U Friction and cementation combining type rock anchorage bar |
| 10/28/1987 | CN86102783A Improvement in roof bolting legs |
| 10/14/1987 | EP0241451A1 Rock anchor |
| 10/13/1987 | US4698994 Mechanism for preliminary anchoring of a wire rope bolt |
| 09/29/1987 | US4696606 Method of stabilizing a rock structure |
| 09/17/1987 | DE3622651C1 Safety nail (spike) having an expansion shell arranged at one end |
| 09/15/1987 | US4693638 Roof bolt assembly having a sealing plug for preventing a deterioration of the mine roof |
| 09/15/1987 | CA1226752A1 Expansion shell |
| 07/22/1987 | CN86201281U Auchor rod with tilting head |
| 07/14/1987 | US4679966 Roof bolt apparatus with expansion shell and coupling |
| 07/07/1987 | US4678374 Roof bolt with expansion shell and threaded nut |
| 06/17/1987 | CN86107168A Method and a device for guiding a concrete feeding hose in connection with the grout feed in rock bolting |
| 05/27/1987 | EP0223542A1 Rock bolt construction and installation |
| 05/27/1987 | CN86206348U Expansion tube type anchor rod |
| 05/19/1987 | US4666345 Rock bolt structure |
| 05/13/1987 | CN86107284A Method of and a device for carrying out wire bolting |
| 05/12/1987 | US4664573 Mine wall support anchor |
| 05/12/1987 | US4664561 Combined resin-mechanical mine roof bolt anchor |
| 05/12/1987 | US4664555 Tension member for a rock anchor or the like |
| 05/06/1987 | EP0221020A2 Cartridge for curing materials |
| 05/05/1987 | US4662795 Method of supporting a mine roof using nut element with breakable portion |
| 04/29/1987 | EP0220161A1 Anchor, especially a free-play anchor |