| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 11/10/1992 | US5161916 Self-seating expansion anchor |
| 11/10/1992 | US5161296 Method of securing an anchor with extrusion plastic molding in a solid wall substrate |
| 11/04/1992 | CN2120880U Cable of arch shed for mine |
| 10/29/1992 | WO1992018752A1 Articulated anchor bolt |
| 10/27/1992 | CA2066990A1 Rock bolting |
| 10/23/1992 | CA2066531A1 Rockbolt anchoring head |
| 10/14/1992 | CN2118817U Expansive shell anchor rod for mine |
| 10/10/1992 | CA2065469A1 Roof bolts |
| 09/30/1992 | CN2117469U Metallic multiple-slit tube fastening anchoring bolt with two wedges |
| 09/16/1992 | EP0437468A4 Rock stabilizer |
| 09/15/1992 | US5147151 Washer insert for bearing plate |
| 09/08/1992 | CA1307172C Load-indicating device |
| 09/02/1992 | CN2114702U Plastic expansive shell die for mine archoring-bolt |
| 08/12/1992 | EP0433342A4 Rock bolt |
| 08/11/1992 | US5137395 Dynamic earth anchor, and a sleeve therefor |
| 08/05/1992 | CN2112008U Safety supporting roof for mine |
| 07/07/1992 | CA1304611C Reinforcing method and means |
| 07/01/1992 | CN2108799U Lengthen anchoring-bolts with cement rolling anchor |
| 07/01/1992 | CN2108798U Anchor traction fixer |
| 06/24/1992 | CN2108176U Clamp for measuring anchoring force of metal pipe seam anchoring-bolt |
| 06/11/1992 | WO1992009789A1 Rock bolt |
| 06/10/1992 | CN2106891U Bamboo moulding anchoring bolt for supporting galleries |
| 06/10/1992 | CN2106890U Composite anchoring bolt of bamboo fibre |
| 05/19/1992 | US5114278 Mining bolt apparatus and method |
| 05/19/1992 | CA1300940C Tubular rock bolt |
| 05/14/1992 | WO1992008040A1 Self-tapping, and self-tapping and self-drilling, rock bolts |
| 05/14/1992 | CA2095230A1 Self-tapping, and self-tapping and self-drilling, rock bolts |
| 05/12/1992 | US5112160 Rock anchor |
| 05/06/1992 | CN2103641U Manual hydraulic measurer for pulling force-resisting of anchoring-bolt |
| 05/06/1992 | CN2103640U Pre-grouting inserted type inverse wedge anchoring-bolt |
| 04/16/1992 | DE4032682A1 Anchor fixed in solid rock - consists of corrugated hollow sleeve surrounding carbon@ steel tension bar set in hardening substance |
| 04/08/1992 | CN2101113U Yielding cement coil anchor rod |
| 04/07/1992 | CA1298498C Anchoring device, such as a rock anchor |
| 04/07/1992 | CA1298497C Rock anchor assembly for securing roadways and wall surfaces of open cuts and tunnels |
| 04/06/1992 | CA2052568A1 Roof bolt with paddle resin mixer and method for making the same |
| 03/25/1992 | CN2099840U Bolt bamboo anchor rod |
| 03/25/1992 | CN2099839U Triple wedge firmly braced elastic riveted pipe |
| 03/24/1992 | US5098227 Tubular retainer for mine roof expansion anchor and method of use |
| 03/11/1992 | CN2098555U Recoverable anchor bolt |
| 03/10/1992 | US5094577 Mine roof expansion anchor |
| 02/26/1992 | EP0280705B1 Process and device for producing drilling holes from an angled position in relation to the drilling axes |
| 02/18/1992 | US5088866 Indicator-nut threaded coupling with load-indicating device adapted to be arranged on anchors, in particular grouted anchors for mining or the like |
| 02/12/1992 | CN2095938U Double rod anchored support |
| 02/11/1992 | US5087160 Anchor bolt and expansion shell assembly |
| 02/04/1992 | CA1295155C Rock anchor |
| 01/23/1992 | WO1992001141A1 Drillable ground support bolt |
| 01/21/1992 | US5082399 Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means |
| 01/18/1992 | WO1992001859A1 Rock bolt system and method of rock bolting |
| 01/15/1992 | CN2093241U Recoverable expanding anchor bar for tunnel timbering |
| 01/14/1992 | CA1294157C Hollow fiber glass roof bolt |
| 01/09/1992 | DE4021271A1 Reducing tension stress in roof of underground working - involves rock anchors in clusters coupled together by tie rods and fixed to face by plates |
| 01/08/1992 | CN2092604U Controllable, steel stretching anchoring-bolts |
| 01/07/1992 | US5078547 Expansion assembly for mine roof bolts |
| 12/31/1991 | US5076734 Roof bolt with paddle resin mixer and method for making the same |
| 12/25/1991 | CN2091352U Easily recovering anchor rod |
| 12/17/1991 | US5073065 Roof support |
| 12/17/1991 | US5073064 Method and apparatus for retorquing an installed mine roof bolt |
| 12/13/1991 | CA2018970A1 Rockbolt load indicator |
| 12/11/1991 | CN2090420U Friction type anchoring-bolt with big inch tube and throughout seam |
| 11/14/1991 | WO1991017342A1 Method of installing a rock bolt and a rock bolt |
| 11/13/1991 | CN2088601U 锚杆桁架 Bolt Truss |
| 11/12/1991 | US5064311 Mine roof support structure and method |
| 10/30/1991 | CN2087690U Threaded type anchor bar |
| 10/25/1991 | CA2039663A1 Coupling for anchor rod and sleeve |
| 10/17/1991 | WO1991015657A1 Injection drilling anchor |
| 10/17/1991 | WO1991015656A1 Injection bore anchor with conveyor screw |
| 10/17/1991 | CA2039787A1 Roof bolt with plastic sleeve and mechanical anchor |
| 10/16/1991 | CN2086796U Easy-to-recover anchor rod |
| 10/09/1991 | EP0450158A1 Controlled threaded fastener with load indication device for use with rock bolts, in particular with injection rock bolts for mining or the like |
| 10/08/1991 | US5054146 Anchor bolt |
| 10/01/1991 | US5052861 Roof bolt with plastic sleeve and mechanical anchor |
| 09/17/1991 | CA1288979C Roof bolt anchor |
| 09/03/1991 | US5044832 Method of and arrangement for setting anchors in loose rock ranging from cohesion-poor to non-cohesion rocks |
| 08/27/1991 | US5042961 Roof bolt with helical coil and bail anchor |
| 08/27/1991 | CA1287990C Anchor bolt assembly |
| 08/27/1991 | CA1287989C Anchor bolt assembly |
| 08/01/1991 | DE4018703C1 Improved cable anchor - includes several laminations and has fixing at end towards bottom of bore hole |
| 07/31/1991 | CN2081884U Improved telescopic anchor rod |
| 07/24/1991 | EP0437468A1 Rock stabilizer. |
| 07/23/1991 | US5033909 Coupling for anchor rod and sleeve |
| 07/23/1991 | CA1286603C Method of stabilizing a rock structure and stabilizer therefor |
| 06/26/1991 | EP0433342A1 Rock bolt |
| 06/20/1991 | DE4036721A1 Drilling or driving holes in cave walls or floors - involves use of drill rod and head inside associated tube and sealing free end |
| 06/11/1991 | US5022791 Process, anchoring member, and clamping device for clamping a rod |
| 05/28/1991 | US5018919 Combined rigid profile and stretching roof bolt with expansion element |
| 05/21/1991 | CA1284280C Versatile roof bolt assembly |
| 05/07/1991 | US5013192 Dynamic rock stabilizing fixture |
| 04/30/1991 | US5011337 Mine roof expansion anchor shell and leaf |
| 04/23/1991 | US5009549 Expansion assembly for mine roof bolts |
| 04/23/1991 | CA1283311C Rock bolt construction and installation |
| 04/02/1991 | US5003749 Grouting anchor to be inserted in a predrilled hole |
| 03/20/1991 | CN2073475U Anchor rolling rod made of superrapid-hard common cement |
| 02/21/1991 | WO1991002141A1 Device for ground consolidation variable-length grouting bolt |
| 02/20/1991 | CN2071705U Wood anchored reusable type metal anchor botl |
| 02/14/1991 | DE4024869A1 Hydraulic self-drilling rock anchor - consists of tube deformed along its length by involuted slot with central axial borehole for fluid |
| 01/24/1991 | DE3922906A1 Flexible rock anchors for cramped conditions in a mine - consists of cone shaped links on cable core |
| 01/15/1991 | US4984938 Coated washer for an anchor bolt system |
| 01/15/1991 | US4984937 Rock bolt |
| 01/09/1991 | CN2069017U Fascia for anchoring-bolts |
| 12/25/1990 | US4979848 Drilling device |