| Patents for E21B 6 - Drives for drilling with combined rotary and percussive action (930) |
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| 08/21/1997 | WO1997030261A1 Dual-member pipe joint for a dual member drill string |
| 07/24/1997 | WO1997026090A1 Magnetostrictive actuator |
| 05/07/1997 | DE19549160C1 Rotary impact drill mechanism |
| 04/24/1997 | WO1997014870A1 Shock-absorbing mechanism for hydraulic hammering device |
| 04/23/1997 | EP0712461A4 Rotary piston driving mechanism |
| 03/18/1997 | CA2100085C Drilling process and device |
| 03/12/1997 | EP0694112B1 Rock drill |
| 01/23/1997 | WO1997002405A1 Drilling apparatus |
| 01/14/1997 | US5592866 For converting longitudinal reciprocating motion to longitudinal motion |
| 01/02/1997 | EP0584110B1 A method and an arrangement for controlling the supply of air into a rock drilling machine |
| 12/24/1996 | US5586840 Apparatus for digging soil foundation and method for constructing underground wall by using the apparatus |
| 12/06/1996 | CA2150997A1 Blasthole drill with drill-through pipe rack |
| 10/02/1996 | EP0735230A2 Driving head for the accommodation and guidance of an insertion tool |
| 09/11/1996 | EP0565662B1 Drilling process and device |
| 07/02/1996 | US5531278 Power drill with drill bit unit capable of providing intermittent axial impact |
| 06/12/1996 | CN1124513A Rock drill |
| 05/22/1996 | EP0712461A1 Rotary piston driving mechanism |
| 05/22/1996 | CN2227734Y Impact rotary engineering drilling machine |
| 02/21/1996 | CN1117304A Ground boring device and method for constructing an underground wall using the same |
| 01/31/1996 | EP0694112A1 Rock drill |
| 01/18/1996 | DE4424080C1 Hydraulic striker hammer fixed to drill rod for earth drilling |
| 01/02/1996 | US5479996 Rock drilling device with recoil damper |
| 12/13/1995 | EP0686730A1 Ground boring device and method for constructing an underground wall using the same |
| 12/06/1995 | EP0685301A1 Hydraulic percussive device with infinitely variable number of impacts and impact energy |
| 11/21/1995 | US5467684 Rotary piston driving mechanism |
| 07/12/1995 | EP0662026A1 Nonrotary piston for jackhammer and removable splined nut therefor |
| 06/14/1995 | EP0657616A1 Auger device for piles foundations |
| 06/08/1995 | WO1995015419A1 Ground boring device and method for constructing an underground wall using the same |
| 06/01/1995 | DE4339672A1 Gear for borehole drill drive |
| 05/16/1995 | US5415240 Drilling device for a rock drill |
| 04/25/1995 | US5409072 Method and an arrangement for controlling the supply of air into a rock drilling machine |
| 04/19/1995 | EP0648915A1 Rock drilling device |
| 03/22/1995 | CN1027987C Rotary hole-boring machine |
| 03/01/1995 | EP0580779B1 Wrap spring clutch for percussive apparatus |
| 02/09/1995 | WO1995004207A1 Rotary piston driving mechanism |
| 02/09/1995 | CA2168758A1 Rotary piston driving mechanism |
| 11/24/1994 | DE4317037A1 Drilling apparatus |
| 10/27/1994 | WO1994024403A1 Rock drill |
| 10/18/1994 | US5355966 Drilling method and an assembly for performing the method |
| 09/27/1994 | US5350025 Nonrotary piston for jackhammer and removable splined nut therefor |
| 09/13/1994 | CA2007428C Hydraulic jackhammer |
| 07/27/1994 | CN1090012A Nonrotary piston for jackhammer and removable splined nut therefor |
| 07/05/1994 | US5325950 In a percussive apparatus |
| 06/14/1994 | US5320189 Rock drilling device |
| 04/26/1994 | US5305835 Nonrotary piston for jackhammer and removable splined nut therefor |
| 03/31/1994 | WO1994006600A1 Nonrotary piston for jackhammer and removable splined nut therefor |
| 03/31/1994 | CA2145301A1 Nonrotary piston for jackhammer and removable splined nut therefor |
| 03/02/1994 | EP0584110A1 A method and an arrangement for controlling the supply of air into a rock drilling machine. |
| 03/01/1994 | US5289887 Method of operating an earth boring machine |
| 01/11/1994 | US5277098 On-off valve for hydraulic rockdrill |
| 12/23/1993 | DE4225701C1 Rotary drilling appts. with percussion capability - has two coaxial strings with variable rotational speed and direction |
| 12/09/1993 | DE4232560C1 Earth-drilling auger device - has screw shaft bore provided with check valve |
| 11/23/1993 | US5263545 Method and apparatus for drilling holes in soil or rock |
| 10/13/1993 | EP0565500A1 Rock drilling device |
| 09/29/1993 | CN1076761A Vibration anchoring-bolt drill |
| 05/26/1993 | EP0543140A2 Drilling device for civil engineering and method for making stabilizing columns or similar structures in the ground |
| 05/13/1993 | DE4142733A1 Bohrverfahren und einrichtung zur ausuebung des verfahrens Drilling method and device for performing the method |
| 05/09/1993 | WO1993009328A1 Drilling process and device |
| 05/04/1993 | US5207280 Device in hammer machines |
| 03/09/1993 | US5191946 Wrap spring clutch for percussive apparatus |
| 02/17/1993 | EP0527460A2 Method and device for drilling holes in soil or rock, particularly for the insertion of injection anchors |
| 12/02/1992 | EP0516599A1 Device in hammer machines |
| 11/26/1992 | WO1992020898A1 A method and an arrangement for controlling the supply of air into a rock drilling machine |
| 11/04/1992 | CN1065914A Wrap spring clutch for precussive apparatus |
| 10/19/1992 | WO1992018784A1 Wrap spring clutch for percussive apparatus |
| 10/19/1992 | CA2105080A1 Wrap spring clutch for percussive apparatus |
| 09/16/1992 | CN1064521A Rotary punching and gripping borer |
| 08/18/1992 | US5139093 Wrap spring clutch for percussive apparatus |
| 08/13/1992 | DE4103196A1 Thrust bore earth drilling machine - has hammer action applied to boring tool |
| 06/30/1992 | US5125464 Drilling device for the study and exploitation of the subsoil |
| 06/02/1992 | US5117923 Hydraulic jackhammer |
| 04/28/1992 | US5107933 Hydraulic drilling outfit |
| 04/15/1992 | CN2101738U Multifunctional drilling machine for trailer |
| 04/01/1992 | CN2100475U Rotary piercing and grabbing drilling machine |
| 03/24/1992 | CA1297868C Arrangement for mounting of a rotation element in a drilling machine |
| 03/24/1992 | CA1297867C Arrangement for supporting of a shank of a drilling machine |
| 03/24/1992 | CA1297866C Arrangement for the axial bearing of a drilling machine |
| 01/29/1992 | CN1058253A Rotary impast reverse circulation drilling system |
| 11/27/1991 | EP0458767A2 Steering mechanism for a subsoil boring apparatus |
| 11/26/1991 | CA2036528A1 Steering mechanism for a subsoil boring apparatus |
| 11/12/1991 | US5064003 Hydraulic drilling machine |
| 11/12/1991 | US5064002 Concentric drill rod assemblies for percussion rock drills |
| 10/29/1991 | US5060734 Seawater hydraulic rock drill |
| 10/08/1991 | US5054565 Steering mechanism for a subsoil boring apparatus |
| 10/08/1991 | CA1290319C Hydraulically powered rotary percussive machines |
| 09/24/1991 | CA1289552C Body construction for a drilling machine |
| 09/10/1991 | CA1288762C Arrangement for supporting of an axial bearing of a drilling machine |
| 09/03/1991 | US5044398 Control valve for counterblow-tap hole-boring machine |
| 08/20/1991 | US5040618 Pneumatic drill |
| 05/15/1991 | EP0427663A1 Hydraulic drilling device and method for use |
| 05/09/1991 | CA2029094A1 Hydraulic drilling outfit |
| 05/07/1991 | US5012762 Device for determining the index of individual productivity and feed ration of animals |
| 04/30/1991 | US5010963 Hydraulic drilling machine |
| 04/09/1991 | US5005656 Device in impact machines |
| 02/19/1991 | US4993504 Device for efficient energy transfer and damping of impact drilling machines |
| 02/12/1991 | US4991669 Device for controlling the passage of a flushing medium in impact machines |
| 10/24/1990 | EP0372089A4 Method and device for determining the quantity of milk extracted from one cow |
| 10/10/1990 | EP0382852A4 Device for determining the index of productivity and food ration of animals |
| 09/26/1990 | EP0389454A1 Device in impact machines |
| 09/18/1990 | US4957171 Pneumatic drill |