| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 06/13/2000 | CA2082342C Expansion shell assembly |
| 06/08/2000 | WO2000032946A1 Wedge anchor for concrete |
| 05/31/2000 | DE19852455A1 Verankerungseinrichtung mit seismischem Sensor Anchoring device with seismic sensor |
| 05/31/2000 | CN2380688Y Self-arching anchor rod capable of withdrawing |
| 05/23/2000 | CA2254302A1 An improved friction washer |
| 05/17/2000 | EP1001134A1 Anchoring device with a seismic sensor |
| 05/02/2000 | US6056482 Cable bolt head |
| 05/02/2000 | CA2200834C Stress measuring rock support device |
| 04/26/2000 | EP0995878A2 Rock anchor and borehole with said anchor installed |
| 04/13/2000 | WO2000020724A1 Jacket tube for a drilling and anchoring device |
| 04/13/2000 | CA2346212A1 Jacket tube for a drilling and anchoring device |
| 04/05/2000 | EP0990074A1 Process and device for boring holes |
| 03/28/2000 | CA2087424C Rock bolt system and method of bolting |
| 03/21/2000 | US6039509 Mine roof support apparatus and method |
| 03/16/2000 | WO2000008304A8 Rock bolting method and apparatus |
| 03/16/2000 | DE19823238C1 Arrangement for introducing at least one steel tensioner into pipe has arrangement for feeding penetration tips into ends of steel objects arranged between drive unit and front end of pipe |
| 03/15/2000 | EP0662018B1 Hollow bars and method of manufacture |
| 03/08/2000 | CN2367772Y Plutonic plug |
| 03/08/2000 | CN2367771Y Wedge-type two-wing tubelike anchor rod |
| 03/07/2000 | US6033153 Rock bolt and method of installing a rock bolt |
| 02/29/2000 | US6030151 Method for reinforcing rock with a tendon |
| 02/17/2000 | WO2000008304A1 Rock bolting method and apparatus |
| 02/09/2000 | CN2363060Y Reversed wedge expansion type rubber plastics steel anchoring-bolt rod capable of obtaining any anchor fixing length |
| 02/02/2000 | EP0976873A1 Injection- or prestressed ground anchor |
| 01/06/2000 | WO2000000718A1 Tie rod especially for securing rock walls, and a method for producing such a tie rod |
| 12/30/1999 | DE19828371A1 Composite stabilizing bolt with a threaded head end and compression nut used for stabilization of rock or structures, use of bolt and manufacturing methods |
| 12/21/1999 | US6004077 System for securement of a mesh screening means and method of installation |
| 12/16/1999 | DE19835814A1 Rock anchor for mountaineering |
| 12/15/1999 | CN2353891Y Recoverable resin anchor rod |
| 12/08/1999 | CN2352674Y Anchoring-bolt for rock |
| 12/07/1999 | US5997219 Tube-formed expansion rock bolt |
| 12/05/1999 | CA2273744A1 Hydraulic cable tensioner |
| 12/02/1999 | WO1999061749A1 Rock bolt and method of forming a rock bolt |
| 12/01/1999 | EP0960266A1 A cable bolt |
| 12/01/1999 | CN2351554Y Strength round steel spiral coil resin roofbolt |
| 12/01/1999 | CN1237222A Process and device for simultaneously drilling and lining hole |
| 11/24/1999 | CN2350526Y Anchor-before-pour type anchoring-bolt anchor head device |
| 11/24/1999 | CN1046785C 岩栓 The rock bolt |
| 11/16/1999 | US5984588 Method for the stabilization of rock masses and related stabilization element |
| 11/10/1999 | CN1046335C Integrated drilling and rock bolting apparatus |
| 11/04/1999 | WO1999056001A1 Device for a rock wall |
| 11/03/1999 | EP0953727A1 Fixing element for a reinforcement connection, in particular for seismic protection |
| 10/28/1999 | DE19818739A1 Befestigungselement zum nachträglichen Bewehrungsanschluß, insbesondere für Erdbebensicherung Fastener for post-installed rebar connection, particularly for earthquake safety |
| 10/27/1999 | CN2345693Y Anchor for support |
| 10/27/1999 | CN2345298Y Band steel for supporting anchor piece |
| 10/13/1999 | EP0948701A1 Process and device for simultaneously drilling and lining a hole |
| 10/13/1999 | EP0847480B1 Rockbolt nut assemblies |
| 10/13/1999 | EP0749518A4 Rock bolt |
| 10/13/1999 | EP0595966B1 A cable bolt |
| 10/13/1999 | CN2343343Y Nut for supporting anchoring-bolt |
| 10/07/1999 | WO1999050531A1 A friction rock stabilizer |
| 10/06/1999 | CN2342098Y Case expanding type anchor head and anchor rod |
| 10/06/1999 | CN1230625A Support anchor |
| 09/21/1999 | US5954456 Torque nut for mine roof bolt assembly |
| 09/21/1999 | US5954455 Combination bolt system |
| 09/15/1999 | CN2338489Y Anchoring-bolt having tension indicating means |
| 09/07/1999 | CA2089038C Method of manufacturing an anchor element from a strand of twisted steel wire |
| 09/01/1999 | CN2336095Y Left-hand screw anchor bolt |
| 08/11/1999 | EP0934454A1 Anchoring device with strain measurement system |
| 08/03/1999 | US5931606 Stabilizer length coding system |
| 08/03/1999 | US5931064 For inserting a bare-ended, multi-strand cable into a hole |
| 07/28/1999 | EP0710320A4 A bearing plate assembly |
| 07/27/1999 | US5929341 Stress measuring rock support device |
| 07/06/1999 | US5919006 Tensionable cable bolt with mixing assembly |
| 06/30/1999 | CN2326728Y Expansion-cracking type self-adaptive multi-point-anchoring anchor |
| 06/16/1999 | CN2324285Y Rust-proof reinforced anchor bolt |
| 06/09/1999 | EP0749364B1 Method of securing an anchor with extrusion plastic molding in a solid wall substrate |
| 06/08/1999 | CA2251049A1 Mine roof bolt anchor |
| 05/26/1999 | CN1217418A Roofbolt of glass fiber reinforced plastics and producing method therefor |
| 05/19/1999 | CN2319569Y Detatchable anchoring rod |
| 05/12/1999 | CN2318399Y Double-anchor-head rockbolt |
| 05/05/1999 | CN2317310Y All screw hollow grouting anchoring-bolt |
| 04/28/1999 | EP0694113A4 Integrated drilling and rock bolting apparatus |
| 04/27/1999 | CA2107826C Mine roof bolt |
| 04/14/1999 | CN2313960Y Recoverable plastic anchor stock |
| 03/23/1999 | US5885034 Washer for use in mining |
| 03/23/1999 | US5885031 Mine roof bolt anchor |
| 03/17/1999 | EP0540601B1 Rock bolt system and method of rock bolting |
| 03/16/1999 | US5882148 Apparatus for yielding support of rock |
| 03/03/1999 | CN1209501A Deep-hole flexible super-long anchoring device for mine and using method thereof |
| 02/24/1999 | CN2308710Y Mine deep hole flexible superlength anchoring implement |
| 02/23/1999 | US5873689 Low torque threaded fastener and mine roof support system using such a fastener |
| 02/18/1999 | DE19735457A1 Injection and pressure body |
| 01/06/1999 | CN2303082Y Spiral anchoring-bolt |
| 12/30/1998 | WO1998059154A1 Torque nut for mine roof bolt assembly |
| 12/29/1998 | USRE36019 Roof control system |
| 12/23/1998 | WO1998058132A1 Process and device for boring holes |
| 12/23/1998 | CA2294883A1 Process and device for boring holes |
| 12/22/1998 | US5851481 Rebar with vanadium alloy |
| 12/22/1998 | CA2167655C Mine roof support system including an expansion anchor with means assisting resin component mixing and method of installation thereof |
| 12/17/1998 | WO1998057035A1 A rock bolt |
| 12/17/1998 | CA2293518A1 A rock bolt |
| 12/09/1998 | EP0882173A1 Joining of tube-formed expansion bolt |
| 12/04/1998 | CA2206909A1 Resin dam for an anchoring bolt |
| 12/02/1998 | EP0800615B1 Rod for an anchor inserted by drilling and injection grouting |
| 11/19/1998 | WO1998051904A1 Apparatus for bending and cutting cable in rock bolting equipment |
| 11/04/1998 | EP0875663A1 Roof bolt with a visual length indicator |
| 11/03/1998 | US5829922 Cable bolt head |
| 10/29/1998 | WO1998048147A1 Feeding device for feeding a wire in a rock bolting equipment |
| 10/27/1998 | US5827014 Friction rock stabilizer |