| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 12/19/1990 | CN2067754U Hanging anchoring-rod ingrated joist |
| 12/19/1990 | CA2019045A1 Expansion assembly for mine roof bolts utilized in small diameter bore holes |
| 12/13/1990 | DE3919103A1 Anchor plate for wire rope - is recessed in region of opening through which rope passes to be clamped |
| 11/28/1990 | CN2066492U Anchoring-bolt for shaft-lining protection |
| 11/14/1990 | CN2065668U Filling machine |
| 11/13/1990 | US4969778 Expansion assembly for mine roof bolts utilized in small diameter bore holes |
| 11/07/1990 | EP0396197A2 Anchoring device for supporting excavations in rock |
| 10/24/1990 | EP0394179A1 Combined rigid profile and extension anchor with expansion element |
| 10/18/1990 | DE4011900A1 Combination rock anchor rod - comprises pointed rod deformed with slits and recesses and covered part of it length with sleeve |
| 10/17/1990 | CN2063978U Built-up extension anchoring-bolt |
| 10/10/1990 | EP0391119A1 Connecting element for a threaded joint of self-drilling injection anchors |
| 10/10/1990 | CN2063577U Glass fibre reinforced plastic mating anchor bolt |
| 09/25/1990 | US4958796 Coupling or connector for securing a load-bearing support to a head of a bolt |
| 09/11/1990 | US4955758 Reinforcing method and means |
| 09/11/1990 | US4955219 Rock bolt |
| 09/04/1990 | US4954018 In a mine |
| 09/04/1990 | US4954017 Expansion bolt and mine roof reinforcement |
| 08/29/1990 | EP0384327A2 Injection anchor for insertion into a predrilled hole |
| 08/28/1990 | US4952096 For stabilizing a terrestrial formation |
| 08/22/1990 | EP0383723A1 Method, anchoring element and tensioning device for tensioning a rod |
| 08/22/1990 | CN2060815U Tooth expanding-locking anchoring-bolts |
| 08/09/1990 | WO1990008877A1 Anchor bolt of oriented polymer |
| 08/07/1990 | US4946314 Rock anchor |
| 08/06/1990 | CA2008982A1 Method, anchoring element and device for tensioning a rod |
| 08/02/1990 | DE3902727A1 Glass-fibre-reinforced, resin-bedded roof bolt |
| 07/25/1990 | EP0379388A2 Hollow cable bolt |
| 07/11/1990 | EP0377541A1 Process and apparatus for anchoring the shieldings of a reinforced-earth wall |
| 07/10/1990 | US4940365 Mine roof support plate bolt |
| 07/04/1990 | EP0376925A2 Rock anchor element |
| 06/27/1990 | CN2058695U Movable anchor block |
| 06/26/1990 | CA1270670A1 Anchoring system for the tension member of an anchor, particularly a rock anchor |
| 06/20/1990 | EP0374130A2 Rock anchoring |
| 06/12/1990 | CA1270129A1 Tension member for a rock anchor or the like |
| 06/06/1990 | EP0371463A2 Method for installing an anchor and injection drill anchoring for performing the method |
| 05/31/1990 | WO1990005811A1 Improved rock anchor and method of manufacture |
| 05/30/1990 | EP0370754A2 Expansion assembly for mine roof bolts |
| 05/29/1990 | CA2003979A1 Method of and arrangement for setting anchors in loose rock ranging from cohesion-poor to non-cohesion rock |
| 05/23/1990 | CN2057459U Stretchable anchoring-bolt |
| 05/22/1990 | CA2003629A1 Expansion assembly for mine roof bolts |
| 05/16/1990 | EP0368838A1 Device for the consolidation of geological formations having no or only little stability |
| 05/09/1990 | CN1041988A Anchor block inherent stress bearizing working method and testing device for anchor block pulling force and repetition inherent stress |
| 05/03/1990 | CA2002143A1 Process and apparatus for the protection of non-stable or moderately stable, cohesionless to slightly cohesive geologic formations |
| 05/02/1990 | EP0366337A1 Tubular rock bolt |
| 05/02/1990 | EP0263819B1 Device for anchoring in and/or reinforcing hard materials |
| 04/19/1990 | WO1990004085A1 Rock stabilizer |
| 04/11/1990 | CN1007535B Anchor bolt assembly |
| 04/10/1990 | CA2000361A1 Rock stabilizer |
| 04/05/1990 | DE3833227A1 Wedge disc |
| 04/04/1990 | EP0361690A1 Mine roof anchor assembly supporting nut |
| 04/04/1990 | CN2055539U Self-expansion slit-pipe anchoring bolt |
| 04/03/1990 | US4913593 Mine roof expansion anchor |
| 03/22/1990 | WO1990002866A1 Rock bolt |
| 03/21/1990 | CN1007282B Method of and device for carrying out wire bolting |
| 03/14/1990 | CN2054486U Wedge type steel cable anchor rod |
| 03/07/1990 | CN2054078U Rock anchoring-bolt |
| 03/07/1990 | CN2054077U Wire rope elongation anchoring-bolt |
| 03/06/1990 | US4905777 Device for producing drilling holes from an angled position with respect to the drilling axis |
| 02/28/1990 | EP0355379A2 Drilling-injection anchor |
| 02/28/1990 | CN2053666U Tube seam type extensible anchor bolt |
| 02/27/1990 | US4904123 Expansion assembly for mine roof bolts utilized in small diameter bore holes |
| 02/27/1990 | US4904122 Anchoring device, such as a rock anchor |
| 02/14/1990 | EP0354760A2 Mine roof anchor having adjustable resin retaining washer |
| 01/31/1990 | EP0353050A1 A rock Anchor |
| 01/25/1990 | DE3824955A1 Method of producing ground anchors |
| 01/24/1990 | EP0351465A1 Rock bolt |
| 01/24/1990 | CN2051672U Tensible device of anchor shank |
| 01/11/1990 | DE3905128A1 Fully bonding rope anchor |
| 01/02/1990 | US4891072 Anchoring bolts in drillholes |
| 12/28/1989 | DE3915922A1 Method and device for stabilising and supporting rock |
| 12/14/1989 | DE3915921A1 Double-curved, hydraulic, self-clamping rock bolt |
| 11/22/1989 | CN2048110U Equal strength extension anchoring bolt |
| 11/15/1989 | EP0341279A1 Anchoring bolt for rock |
| 11/15/1989 | CN2047721U Light anchor bolts of quick-hardening cement and their installment connector |
| 11/08/1989 | CN1037010A Powder bag for inorganic cement anchor bar |
| 11/01/1989 | CN2046928U Expanding seizure anchor bar |
| 10/25/1989 | CN2046544U Small size seam tube type anchor shank |
| 10/25/1989 | CN2046543U Steel rope-strand cable expansion anchor |
| 10/12/1989 | DE3838880C1 Method of producing a grouted anchor, and grouted anchor for carrying out the method |
| 09/27/1989 | EP0333844A1 Measuring device useful for identifying anchorage loads |
| 09/26/1989 | CA1261558A2 Ground control |
| 09/19/1989 | US4866903 Positioning device |
| 09/13/1989 | CN2044285U Pre-stress plasticable anchorage cable |
| 09/12/1989 | US4865489 Mine roof anchor having adjustable resin retaining washer |
| 08/30/1989 | EP0329835A2 Self drilling injection anchor |
| 08/29/1989 | US4861198 Expansion assembly for mine roof bolts |
| 08/29/1989 | US4861197 Roof bolt system |
| 08/22/1989 | US4859118 Mine roof support anchor and process for installing the same |
| 08/15/1989 | US4856952 Deformed bar for adhesion and applying tension |
| 08/03/1989 | DE3831411A1 Self-restraining hydraulic rock bolt |
| 08/01/1989 | CA1257976A1 Method of stabilizing a rock structure |
| 07/25/1989 | US4850746 Rock anchor assembly for securing roadways and wall surfaces of open cuts and tunnels |
| 07/19/1989 | CN2041360U Snake type telescopic anchoring-bolt |
| 07/18/1989 | US4848971 Roof bolt apparatus |
| 07/06/1989 | DE3741066C1 Flexible material-displacing holding device for a rock anchor |
| 06/27/1989 | US4842063 Anchoring method and capsule therefor |
| 06/15/1989 | DE3741315A1 Rock anchor |
| 06/01/1989 | WO1989004911A1 Anchoring bolt for rock |
| 05/24/1989 | EP0317547A1 Rock anchoring bolt |
| 05/23/1989 | US4832534 Method and device for stressed anchorage |
| 05/17/1989 | EP0315743A1 Method for making a tunnel or gallery, and tunneling machine for carrying out the method |