| Patents for E21B 6 - Drives for drilling with combined rotary and percussive action (930) |
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| 06/26/2002 | EP1101013A4 Reverse circulation drilling system with bit locked underreamer arms |
| 06/13/2002 | US20020070049 Drilling system |
| 06/12/2002 | EP1213441A1 Drilling system |
| 06/04/2002 | US6397956 Directional drilling tool |
| 05/28/2002 | US6394197 Reverse circulation drilling system with bit locked underreamer arms |
| 03/27/2002 | EP1190155A1 Rock drill and mounting frame |
| 03/06/2002 | CN2480534Y Jetting suction type shot bit for oil-gas well |
| 01/24/2002 | US20020008420 Method for performing ground or rock work and hydraulic percussion device |
| 01/09/2002 | CN1077666C Guided drilling system with shock absorber |
| 12/26/2001 | CN2467577Y Three-purpose pile driver |
| 12/20/2001 | DE10002213A1 Optimierung exzenterschlagüberlagerter gegengewuchteter Werkzeuge Optimization exzenterschlagüberlagerter against-balanced Tools |
| 12/12/2001 | EP1162037A1 Rotary percussion device for a drill string |
| 12/04/2001 | CA2009733C Device in impact machines |
| 11/29/2001 | DE10024505A1 Verfahren zur Durchführung von Erd- oder Gesteinsarbeiten und hydraulisches Schlagwerk Method for performing ground or rock work and hydraulic percussion |
| 11/28/2001 | EP1157787A1 Method for soil and stoneworking and hydraulic impact tool |
| 11/15/2001 | WO2001086108A1 Rock drilling machine and alignment piece |
| 11/15/2001 | WO2001086107A1 Rock drilling machine |
| 11/08/2001 | WO2001083170A1 Method and arrangement for adjusting the percussion energy in a percussion drilling apparatus |
| 10/04/2001 | EP1138869A2 Optimization of excentre-driven percussion tools with counterweight |
| 09/30/2001 | CA2313924A1 Optimization of eccentric impact superimposed counter-balanced roller b its |
| 09/19/2001 | CN1071430C Precussive apparatus with wrap spring clutch |
| 09/18/2001 | US6290005 Pneumatic impact damping device for a drill column |
| 08/16/2001 | EP1124037A1 Drilling device |
| 08/14/2001 | US6273199 Arrangement in rock drill and method of controlling rock drilling |
| 08/09/2001 | DE10005475A1 Drilling device; has inner rod, hollow outer rod and rotation device to rotate both rods, which drives drive wheel of outer rod and drive wheel of inner rod |
| 07/05/2001 | WO2001048350A1 Device for hydraulic power supply of a rotary apparatus for percussive drilling |
| 07/05/2001 | CA2394643A1 Device for hydraulic power supply of a rotary apparatus for percussive drilling |
| 07/03/2001 | CA2009378C Device in impact machines |
| 05/30/2001 | CN1296869A Drilling and punching machine |
| 05/23/2001 | EP1101570A2 Drilling- and percussion device |
| 05/23/2001 | EP1101013A1 Reverse circulation drilling system with bit locked underreamer arms |
| 05/23/2001 | DE19955412A1 Bohr- und Meisselgerät Drilling and chiseling |
| 05/15/2001 | CA2009734C Device in impact machines |
| 05/10/2001 | WO2001033043A1 Method and device of controlling a rock drilling machine |
| 04/03/2001 | US6209665 Reverse circulation drilling system with bit locked underreamer arms |
| 03/27/2001 | CA2160995C Rock drill |
| 03/22/2001 | DE19950599A1 Drill for making holes for piles has drilling screw with cutter bit at end, hammer drill being mounted in hollow central tube of drilling screw which has air cushioning system to protect it against effect of drilling screw |
| 03/20/2001 | US6202763 “Twin-impact” double-blow drilling apparatus |
| 01/17/2001 | CN1280646A Directional drilling tool |
| 01/11/2001 | WO2001002691A1 Rock drill and mounting frame |
| 11/21/2000 | US6148934 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 11/15/2000 | CN2406053Y Ratchet-pair mechanism of pneumatic rock-drilling machine |
| 10/10/2000 | US6129162 Rock drill |
| 09/19/2000 | US6119793 Rock drill |
| 08/09/2000 | EP1025334A2 Directional drilling tool |
| 08/03/2000 | DE19857479C1 Impact absorbing mechanism for deep hole hammer drill, has air hole provided for connecting cylinder chamber and channel, which is closed by piston on exertion of axial force |
| 06/28/2000 | EP1012440A1 Boring device |
| 06/14/2000 | CN2382829Y Rotary double rope impact drill |
| 04/26/2000 | CN2375670Y Multi-functional pile driver |
| 04/13/2000 | DE19836389C1 Bohrvorrichtung mit Doppelschlagsystem Drilling device with dual shock system |
| 03/02/2000 | WO2000011304A1 Reverse circulation drilling system with bit locked underreamer arms |
| 03/02/2000 | CA2338579A1 Reverse circulation drilling system with bit locked underreamer arms |
| 02/16/2000 | EP0979920A2 Drill apparatus with twin impact system |
| 02/12/2000 | CA2268400A1 "twin-impact" double-blow drilling apparatus |
| 02/09/2000 | CN2363041Y Rotary electric rock drill |
| 02/09/2000 | CN2363040Y Electric driven rock drill |
| 01/26/2000 | CN2360606Y Hudraulic rock drill |
| 01/20/2000 | WO2000003115A1 Boring device |
| 01/13/2000 | DE19831009A1 Bohrvorrichtung Drilling device |
| 11/02/1999 | US5975221 Machine for horizontal percussion boring |
| 09/30/1999 | DE19813087A1 Drilling device with tubular outer drill stem through which injection drill stem extends |
| 08/18/1999 | EP0817901A4 Dual-member pipe joint for a dual member drill string |
| 07/21/1999 | EP0930476A1 Method for opening and closing a tapping hole of a metallurgical vessel and hammer device, especially for carrying out this method |
| 07/20/1999 | US5924500 Steerable boring machine |
| 07/07/1999 | EP0927294A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 06/24/1999 | WO1999019596A3 Directional drilling tool |
| 04/27/1999 | US5896937 Buffer mechanism of hydraulic impact apparatus |
| 04/22/1999 | WO1999019596A2 Directional drilling tool |
| 04/22/1999 | CA2306944A1 Directional drilling tool |
| 04/08/1999 | DE19732479C1 Hammer drill |
| 04/07/1999 | EP0906811A1 Drill hammer |
| 04/03/1999 | CA2248697A1 Rock drill |
| 03/11/1999 | DE19732480C1 Hydraulic drill with flushing feed |
| 01/21/1999 | DE19741347C1 Drillstring rotary drive with double-acting piston in hydraulic cushioning chambers |
| 12/16/1998 | EP0884448A2 Rock drill bit with helical evacuation grooves |
| 10/28/1998 | EP0874126A1 Method and device for drilling by use of simultaneous percussion and rotation |
| 10/01/1998 | WO1998042481A1 Arrangement in rock drill and method of controlling rock drilling |
| 10/01/1998 | CA2285971A1 Arrangement in rock drill and method of controlling rock drilling |
| 09/15/1998 | US5806404 Rotary piston driving mechanism |
| 08/05/1998 | EP0856637A1 Shock-absorbing mechanism for hydraulic hammering device |
| 07/14/1998 | US5778987 Guided drilling system with shock absorber |
| 06/30/1998 | US5771982 Rock drill |
| 06/23/1998 | US5769172 Power tool |
| 05/06/1998 | CN2280604Y Driving device of electric tool |
| 05/02/1998 | CA2219710A1 Machine for horizontal percussion boring |
| 03/26/1998 | WO1998012410A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 03/26/1998 | CA2266494A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 03/19/1998 | WO1998003309A3 Power tool |
| 01/29/1998 | WO1998003309A2 Power tool |
| 01/22/1998 | DE19629211A1 Boring machine used in tunnel |
| 01/14/1998 | EP0817901A1 Dual-member pipe joint for a dual member drill string |
| 12/16/1997 | US5697459 Directional self-propelled drill |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/21/1997 | CA2205783A1 Steerable boring machine |
| 11/11/1997 | US5685615 Eccentrically driven percussive tools for treating materials |
| 11/05/1997 | EP0805257A2 Guided drilling system with shock absorber |
| 11/04/1997 | US5682956 Dual member pipe joint for a dual member drill string |
| 10/30/1997 | DE19616751A1 Counterboring drill |
| 10/02/1997 | DE19608815C1 Device for producing sealing floor in ground, used in construction |
| 09/16/1997 | US5667022 Hydraulic impact device with continuously controllable impact rate and impact force |