| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 07/27/1994 | CA2132536A1 Yielding roof bolting |
| 07/20/1994 | EP0524223B1 Injection drilling anchor |
| 07/14/1994 | CA2113321A1 Non-metallic reinforcing rod and method of use in supporting a rock formation |
| 06/29/1994 | EP0591210A4 Self-tapping, and self-tapping and self-drilling, rock bolts |
| 06/16/1994 | DE4342529A1 Armierungsspannglied Armierungsspannglied |
| 06/16/1994 | DE4242106A1 Inflatable packing sealing borehole - has piston in hose-supporting tube shutting off filling material and with crown bursting to deliver into hole |
| 06/01/1994 | CN2167188Y Metal anchoring-bolt with flexible steel rope |
| 06/01/1994 | CN2167187Y Double proof function anti-corrsion plastic anchoring-bolt |
| 05/31/1994 | US5316414 Mine roof expansion anchor, tapered plug element used therein and method of installation |
| 05/24/1994 | US5314268 Non-metallic reinforcing rod and method of use in supporting a rock formation |
| 05/11/1994 | WO1994009929A1 Method of securing an anchor with extrusion plastic molding in a solid wall substrate |
| 05/11/1994 | EP0595966A1 A cable bolt |
| 05/11/1994 | CN1086589A Anchor with extrusion plastic bonding |
| 05/07/1994 | CA2082356A1 Self-seating expansion anchor |
| 04/14/1994 | WO1994007619A1 Hollow bars and method of manufacture |
| 04/14/1994 | CA2145522A1 Hollow bars and method of manufacture |
| 04/13/1994 | EP0591210A1 Self-tapping, and self-tapping and self-drilling, rock bolts. |
| 04/13/1994 | CN2161730Y Multi-section anchoring-bolt fastening device |
| 03/31/1994 | DE4232290A1 Securing tunnel on foundation to prevent landslide - involves extrusion anchors in preset spacings, with injection carried out via anchor tubes |
| 03/29/1994 | US5297900 Rock stabilizer |
| 03/29/1994 | CA1328045C Mine roof anchor having adjustable resin retaining washer |
| 03/22/1994 | US5295768 Friction rock stabilizer |
| 03/17/1994 | WO1994005900A1 Rockbolt |
| 03/16/1994 | CN2158920Y Detachable anchoring bolt |
| 03/08/1994 | US5292209 Bearing plate |
| 03/08/1994 | CA1327466C Roof bolt system |
| 03/02/1994 | CN2157984Y Anchoring-bolt |
| 02/22/1994 | US5288176 Yielding grout compactor for mine roof support fixture |
| 02/09/1994 | EP0582554A1 Method for consolidating soil and piercing bit for performing the method |
| 02/09/1994 | CN2155430Y Demountable tube seam anchoring-bolt |
| 02/08/1994 | US5284107 Cable bolt monitoring device |
| 02/02/1994 | CN2154910Y Anchor bar detector |
| 02/01/1994 | US5282698 Threaded fastener, method of fabrication thereof and method of supporting a mine roof using such a fastener |
| 01/12/1994 | CN2152906Y Steel and bamboo combined anchoring-bolt |
| 01/05/1994 | DE4220636A1 Coupling sleeve for self-tapping injection anchors for flushing medium injection during percussion drilling - includes internal thread and axial abutment for screwed-in injection anchor |
| 01/04/1994 | US5275512 Mine roof expansion anchor and bail member therefor |
| 12/29/1993 | CN2151253Y Dismountable anchoring bolts |
| 12/28/1993 | US5273377 Roof bolt |
| 12/15/1993 | CN2149480Y Teeth anchoring-bolt of tension shell type |
| 12/02/1993 | DE4216196C1 Plasticising anchor in rock etc. - has shorter coaxial inner tube inside anchor tube and joined to it at ends for even load distribution |
| 11/24/1993 | CN2147352Y Anchor truss |
| 11/09/1993 | US5259703 Mine roof bolt |
| 10/20/1993 | CN2144178Y Metal staying anchoring-bolt for mine |
| 10/19/1993 | US5253964 Rockbolt anchoring head |
| 10/19/1993 | US5253960 Cable attachable device to monitor roof loads or provide a yieldable support or a rigid roof support fixture |
| 09/22/1993 | CN1076506A Flexible roof bolt |
| 09/14/1993 | US5244314 For anchoring a bolt in a bore hole |
| 09/02/1993 | DE4211334C1 Rock anchor for insertion in poorly cohesive rock - comprises bore anchor producing hole and stabilising hole walling and injection anchor inserted with hardenable medium |
| 09/01/1993 | CN2141466Y Rocoverable quick fixing metal anchor rod |
| 08/19/1993 | DE4204533A1 Injection bore anchor - has anchor rod in area adjacent to anchor plate enclosed by tubular cylindrical rubber component |
| 08/19/1993 | DE4201419C1 Rock anchor for location in rock with low cohesion factor - comprises outer bore anchor for making borehole and stabilising hole wall and injection anchor of hardenable material |
| 08/18/1993 | CN2140428Y Tension anchoring-bolt |
| 08/12/1993 | DE4203740A1 Verfahren zum herstellen eines ankerelementes aus einer litze aus verdrillten stahldraehten A method for producing an anchor element from a strand of twisted stahldraehten |
| 08/10/1993 | US5234291 Roof bolts |
| 08/10/1993 | US5233730 Cable grip |
| 08/05/1993 | WO1993015279A1 Cable bolt |
| 08/05/1993 | CA2129220A1 Cable bolt |
| 08/04/1993 | CN2139627Y Anchoring-bolt for roof floor or shaft-lining protection |
| 08/03/1993 | US5232311 Roof control system |
| 07/27/1993 | US5230589 Mine roof bolt |
| 07/14/1993 | CN2138193Y Flexible telesoopic anchor pin |
| 06/30/1993 | EP0548832A1 Anchoring device for the tensioning rod of an anchor made from fibre-laminate |
| 06/24/1993 | WO1993012324A1 Flexible roof bolt |
| 06/24/1993 | CA2126190A1 Flexible roof bolt |
| 06/23/1993 | CN1073501A Hydraulic expansion type anchor stock for preventing side roof-fall at working face |
| 06/22/1993 | CA2085843A1 Arrangement for anchoring a rod-shaped tension member of composite fiber material |
| 06/16/1993 | CN2136330Y Umbrella type anchoring-bolt |
| 06/15/1993 | US5219248 Mine roof expansion anchor with improved bore hole engagement means and method of installation thereof |
| 05/27/1993 | WO1993010331A1 A friction rock stabilizer |
| 05/26/1993 | CN2134488Y Bamboo fibre anchor rod cabable for exerting prestressing force |
| 05/12/1993 | EP0540601A1 Rock bolt system and method of rock bolting |
| 05/04/1993 | US5207535 Push-on gripper plate for use with rock bolts |
| 04/28/1993 | CN2130923Y Clamp for measuring anchoring force of bamboo or wooden anchoring-bolts |
| 04/28/1993 | CN2130922Y All-plastic expansion solidification anchoring-bolt |
| 04/28/1993 | CN2130921Y Screw thread steel anchoring-bolt |
| 04/01/1993 | WO1993004257A3 Drilling pipe |
| 03/18/1993 | WO1993005274A1 Friction rock anchor |
| 03/17/1993 | EP0532441A1 Method for consolidating tunnel walls, gallery walls, or the like, anchoring bolt for carrying out the method, and method for making such anchoring bolts |
| 03/17/1993 | CN1070028A Open seam friction rock stabilizer |
| 03/16/1993 | CA1314416C Mine roof expansion anchor with improved bail unit |
| 03/11/1993 | EP0540601A4 Rock bolt system and method of rock bolting. |
| 03/09/1993 | US5192169 Friction rock stabilizer |
| 03/09/1993 | US5192146 Open seam friction rock stabilizer |
| 02/18/1993 | WO1993004257A2 Drilling pipe |
| 02/18/1993 | WO1993003256A1 A cable bolt |
| 02/18/1993 | CA2113079A1 A cable bolt |
| 02/18/1993 | CA2093138A1 Drill pipe |
| 02/09/1993 | US5185595 Rockbolt monitor |
| 02/09/1993 | US5184923 Expansion shell assembly |
| 01/28/1993 | DE4125011A1 device to stabilise the separation of inclined rock layers while driving tunnels - consists of anchor rod and integral guide tube which is recessed at lower end to take plugs |
| 01/27/1993 | EP0524226A1 Injection bore anchor with conveyor screw. |
| 01/27/1993 | EP0524223A1 Injection drilling anchor. |
| 01/27/1993 | CN1068292A Production process of plastic expansion casing for flexible roof bolt in tunnel |
| 01/26/1993 | US5181800 Mine roof anchor having adjustable resin retaining washer |
| 12/28/1992 | CA2072515A1 Expansion assembly |
| 12/16/1992 | CN2124999U High resistance extending anchor end fastener |
| 12/02/1992 | CN2123607U Plastic anchor bar for mine |
| 11/25/1992 | CN1019217B Anchor block inherent stress bearing working and testing device for anchor block pulling force and repetition inherent stress |
| 11/19/1992 | EP0514362A1 Sleeve for anchoring bolt |
| 11/11/1992 | CN2121538U Mineral use plastic-resin anchor rod |