| Patents for E21D 3 - Raising shafts, i.e. working upwards from the bottom (70) |
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| 02/26/2015 | WO2015025299A1 Integrated inspection and maintenance raise boring method and an associated drill string arrangement |
| 09/18/2013 | CN103306679A '|'-shaped free surface holing one-step well completion technology |
| 07/03/2013 | CN103184872A Construction method of one-time excavation for large-section vertical well |
| 12/27/2012 | WO2012174608A1 Mobile support system for a raise-boring rig |
| 07/25/2012 | CN101967974B Method for crossed operation of vertical shaft backward-excavation deepening and exploitation projects |
| 06/13/2012 | CN102493809A Comprehensive shaft sinking method of positive and raising boring for vertical shaft |
| 04/24/2012 | CA2735817C External water delivery system for rock drills |
| 08/03/2011 | CN102144073A External water delivery system for rock drills |
| 06/08/2011 | EP2329093A1 External water delivery system for rock drills |
| 02/09/2011 | CN101967974A Method for crossed operation of vertical shaft backward-excavation deepening and exploration and exploitation projects |
| 03/11/2010 | WO2010027526A1 External water delivery system for rock drills |
| 02/12/2008 | CA2397561C Earth discharging device for upward-facing shield machine |
| 08/02/2006 | CN1811130A Controlled deformation method for double-layer structure circular tunnel |
| 02/28/2006 | US7004679 Easily-cuttable tunnel segment structure |
| 11/17/2005 | US20050252693 Securing arrangement for reamers in raise boring |
| 07/12/2005 | US6915864 Cutter structure for shield machine |
| 05/25/2005 | EP1532345A1 Securing arrangement for reamers in raise boring |
| 03/02/2004 | US6698844 Earth discharging device for upward-facing shield machine |
| 01/06/2004 | US6672673 Ore pass inspection system |
| 12/11/2003 | WO2003102356A1 Securing arrangement for reamers in raise boring |
| 12/11/2003 | CA2486108A1 Securing arrangement for reamers in raise boring |
| 06/26/2003 | US20030118408 Earth discharging device for upward-facing shield machine |
| 06/19/2003 | US20030113168 Easily-cuttable tunnel segment structure |
| 05/22/2003 | US20030094311 Cutter structure for shield machine |
| 05/21/2003 | CA2397444A1 Cutter structure for shield machine |
| 04/18/2002 | US20020043426 Modular ladder assembly for mine raise and kit therefor |
| 12/06/2001 | WO2001092679A1 Device for raise boring |
| 04/05/2001 | WO2001023710A1 Ore pass inspection system |
| 04/05/2001 | CA2385794A1 Ore pass inspection system |
| 03/21/2001 | CN1063515C Borehole boring method and machine |
| 11/24/1999 | CN1046784C Reverse sinking construction method for mine vertical shaft |
| 10/08/1998 | WO1998044235A1 Modular ladder assembly for mine raise |
| 10/08/1998 | CA2286911A1 Modular ladder assembly for mine raise |
| 07/22/1997 | US5649745 Inflatable gripper assembly for rock boring machine |
| 05/21/1997 | CN1150212A Reverse sinking construction method for mine vertical shaft |
| 04/09/1997 | EP0767289A1 Inflatable gripper assembly for rock boring machine |
| 04/03/1997 | CA2185495A1 Inflatable gripper assembly for rock boring machine |
| 11/20/1996 | CN1136126A Borehole boring method and machine |
| 11/06/1996 | EP0741227A2 Borehole boring method and machine |
| 06/04/1996 | CA2002393C Mine cooling power recovery system |
| 11/09/1995 | WO1995030068A1 A method and an apparatus for raise mining |
| 08/02/1994 | CA1331176C Apparatus for driving an upwardly directed shaft in rock |
| 04/05/1994 | CA1328253C Equipment for raise mining |
| 12/08/1993 | EP0378562B1 Apparatus for driving an upwardly directed shaft in rock |
| 02/12/1991 | US4991998 Mine cooling power recovery system |
| 01/22/1991 | US4986374 Apparatus for driving an upwardly directed shaft in rock |
| 10/02/1990 | US4960175 Equipment for raise mining |
| 07/25/1990 | EP0378562A1 Apparatus for driving an upwardly directed shaft in rock. |
| 03/28/1989 | CA1251805A1 Mobile service rig |
| 03/21/1989 | CA1251475A1 Raise bore mining method and apparatus for carrying out the method |
| 03/09/1989 | WO1989002025A1 Apparatus for driving an upwardly directed shaft in rock |
| 09/22/1988 | WO1988007123A1 An equipment for raise mining |
| 12/17/1985 | US4558748 Method and equipment for boring and casing air vent holes and/or delivery holes in medium-steep and steep dip coal deposits and rocks of loose structure |
| 03/05/1985 | CA1183556A1 Method and apparatus for rock mining |
| 09/14/1982 | CA1131613A1 Earth boring apparatus |
| 02/23/1982 | US4316515 Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement |
| 02/23/1982 | CA1118756A1 Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement |
| 06/02/1981 | US4270618 Earth boring apparatus |
| 07/01/1980 | CA1080690A1 Raise drill |
| 09/11/1979 | CA1062244A1 Cutter mounting for a large hole earth boring bit |
| 02/20/1979 | CA1048996A1 Raise drilling bit with detachable stem |
| 09/19/1978 | US4114698 Method and apparatus for tunneling upwardly |
| 06/20/1978 | US4095670 Foldable platform for raise drilling |
| 05/16/1978 | US4089382 Cutter mounting for a large hole earth boring bit |
| 01/24/1978 | US4069878 Raise drilling bit with detachable stem |
| 03/01/1977 | US4009909 Upward tunneling |
| 01/25/1977 | US4004644 Roller cutter |
| 12/28/1976 | US3999616 Method and apparatus for establishing the drilling line of an overhead boring machine |
| 12/07/1976 | US3995907 Underground excavating machine having independently movable half-frames |
| 07/27/1976 | US3971449 Procedure for controlling a rock drill and rock drill for carrying out the procedure |