| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 10/15/1998 | WO1998045576A1 Injection device and injection method |
| 10/15/1998 | CA2286025A1 Injection device and injection method |
| 09/30/1998 | EP0867687A1 Stress measuring rock support device |
| 09/30/1998 | EP0867598A1 Rockbolt assemblies |
| 09/29/1998 | CA2123306C A friction rock stabilizer |
| 09/22/1998 | USRE35902 Bearing plate |
| 09/16/1998 | CN2291504Y Reiforced anchoring-bolt |
| 09/16/1998 | CN2291503Y Anti-corrosion anchor beam |
| 09/16/1998 | CN2291502Y Anti-corrosion metal anchoring-bolt |
| 09/09/1998 | EP0863295A1 Method and device for setting anchoring bolts |
| 09/08/1998 | US5803671 Hollow bars and method of manufacture |
| 09/02/1998 | EP0861986A1 Anchor for rock or concrete |
| 09/02/1998 | EP0861969A1 Mine roof bearing plate |
| 09/02/1998 | CN2289879Y Universal wirerope rockbolt body |
| 09/02/1998 | CN2289830Y Sand consolidation anchor head prestressed rockbolt |
| 09/02/1998 | CN1191929A Well and tunnel support and supporting method |
| 08/26/1998 | CN2289056Y Anchoring-bolt for supporting rib for coal mine gallery |
| 08/11/1998 | US5791828 Plate for use in support of a mine roof |
| 08/11/1998 | US5791824 For anchoring in a borehole of a rock structure |
| 08/11/1998 | US5791823 Yielding head for mine support |
| 08/11/1998 | CA2091662C Mine roof bolt |
| 07/31/1998 | CA2228365A1 Friction rock stabilizer |
| 07/30/1998 | DE19702749A1 Procedure for installing injection hole ground anchor |
| 07/28/1998 | US5785463 Combination cable bolt system |
| 07/15/1998 | CN1039149C Method for forming high-strength anchor |
| 07/07/1998 | US5775850 Rock bolt |
| 07/07/1998 | US5775849 Coupler for ducts used in post-tension rock anchorage systems |
| 06/23/1998 | US5769570 Cable tensioning dome plate |
| 06/17/1998 | EP0847480A1 Rockbolt nut assemblies |
| 06/17/1998 | CN1038778C Open seam friction rock stabilizer |
| 06/16/1998 | US5765969 Tubeformed rock bolt |
| 06/09/1998 | US5762451 Multi-piece, split bail expansion anchor |
| 06/03/1998 | EP0845579A1 Tunnel lining |
| 05/28/1998 | DE19649941A1 Method for solidifying brittle rock layers rock layers |
| 05/27/1998 | EP0843775A1 A method for reinforcing rock with a tendon |
| 05/26/1998 | US5755535 Mine roof truss system and related installation method |
| 05/22/1998 | WO1998021439A1 Process and device for simultaneously drilling and lining a hole |
| 05/20/1998 | EP0843073A1 Method and device for setting injection anchoring bolts |
| 05/12/1998 | US5749681 High tensile strand, anchorages and methods of installation thereof |
| 05/07/1998 | WO1998019044A1 Anchoring device with strain measurement system |
| 05/05/1998 | CA2089609C Rockbolt |
| 04/29/1998 | CN2280157Y High strength steel ream anchoring-bolt |
| 04/28/1998 | US5743678 Anchor eye-bolt for mine roof |
| 04/21/1998 | US5741092 Cable bolt driver |
| 04/14/1998 | US5738466 Ribbed flexible member for casting into an anchorage medium |
| 04/08/1998 | CN2278083Y High-strength metal anchor shaft |
| 04/07/1998 | US5735653 Anchor rod for composite anchors |
| 04/02/1998 | WO1998013580A1 A method of pre-stressing a tendon |
| 04/01/1998 | EP0659231B1 Rockbolt |
| 03/31/1998 | US5733069 Loose roof plate retensioning device |
| 03/31/1998 | CA2116537C Friction rock anchor |
| 03/19/1998 | WO1998011324A1 A cable bolt |
| 03/19/1998 | DE19638050A1 Anchor plate for securing wall of mine construction |
| 02/24/1998 | CA2108314C Bending and feeding apparatus for installing a cable into a preformed bore |
| 02/18/1998 | EP0680545B1 Means for anchoring a rock bolt made of concrete steel in a drill hole |
| 02/05/1998 | DE19631039A1 Method of placing rockbolt via medium=filled cavity and drillrod |
| 01/20/1998 | CA2098071C Mine roof expansion anchor, tapered plug element used therein and methodof installation |
| 01/15/1998 | DE19712181A1 Drill bit |
| 01/11/1998 | CA2180878A1 Friction rock stabilizers |
| 01/07/1998 | EP0815329A1 Multilayer traction element in the form of a loop |
| 01/07/1998 | CN2272052Y Chloromagnesite anchoring-bolt tray |
| 01/07/1998 | CN2272051Y Rod recoverable metal anchoring-bolt with plastic expander |
| 12/23/1997 | US5699572 For rotating a multi-strand cable rock anchor |
| 12/11/1997 | WO1997046794A1 A method for reinforcing rock with a tendon |
| 12/11/1997 | CA2230499A1 A method for reinforcing rock with a tendon |
| 12/03/1997 | CN2269465Y Rod reclaimable anchor rod |
| 12/03/1997 | CA2206556A1 Cable tensioning dome plate |
| 11/25/1997 | US5689923 Device for securing steel reinforcing or prestressing members in an anchorage |
| 11/18/1997 | US5688077 Rock anchor bolt |
| 11/15/1997 | CA2176516A1 Anchor eye-bolt for mine roof |
| 11/13/1997 | DE19609914A1 Mechanical anchor for pre-stressing or supporting building structure |
| 11/12/1997 | CN2267327Y Composite glass fiber reinforced plastic anchoring-bolt |
| 10/21/1997 | CA2147179C Multiple cable rock anchor system |
| 10/15/1997 | EP0800615A1 Rod for an anchor inserted by drilling and injection grouting |
| 10/01/1997 | CN1160809A Tunnel lining |
| 09/10/1997 | EP0794336A1 Anchoring bar for compound anchor |
| 09/03/1997 | EP0728256B1 Injection cable bolt |
| 08/28/1997 | WO1997031177A1 Joining of tube-formed expansion bolt |
| 08/28/1997 | CA2246996A1 Joining of tube-formed expansion bolt |
| 08/13/1997 | EP0739442B1 Tensionable gfp rock anchor |
| 08/12/1997 | CA2029113C Mine roof expansion anchor |
| 07/23/1997 | CN2258226Y Water wave expansion anchoring-bolt |
| 07/22/1997 | US5649790 Friction rock stabilizer and method for insertion |
| 07/22/1997 | US5649789 Integrated drilling and rock bolting apparatus |
| 07/15/1997 | US5647709 Anchor bolt anchorable by explosive charge |
| 07/15/1997 | US5647694 For supporting rock within a mine |
| 07/12/1997 | CA2194817A1 Combination cable bolt head |
| 07/09/1997 | EP0591210B1 Self-tapping, and self-tapping and self-drilling rock bolts |
| 06/11/1997 | CN2256037Y Small diameter elastic circular wedge recoverable anchor rod |
| 06/10/1997 | US5637158 Method for the manufacture of an expansible anchor consisting of corrosion-resistant steel |
| 06/10/1997 | US5636945 Rockbolt |
| 05/28/1997 | CN2254954Y Moment forcing anchoring type recoverable anchoring-bolt |
| 05/13/1997 | US5628587 For use with a rock bolt |
| 04/29/1997 | US5624212 Anchored cable sling system |
| 04/22/1997 | US5622454 Anchor bolt for stabilizing rock strata and method of installing |
| 04/17/1997 | WO1997013955A1 Anchor plate |
| 04/16/1997 | CN2252213Y Prestressed compound ground tackle |
| 03/30/1997 | CA2186672A1 Rock anchor |
| 03/26/1997 | EP0749364A4 Method of securing an anchor with extrusion plastic molding in a solid wall substrate |
| 03/12/1997 | CN1144876A Equi-strength prop pressure-relieving achor bar for expansive soft rock |