| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 01/21/1998 | EP0819823A2 Apparatus for completing a subterranean well and method of using same |
| 01/20/1998 | CA2102984C Sealed bearing assembly used in earth drilling |
| 01/15/1998 | WO1998001651A1 Wellbore tractor |
| 01/08/1998 | WO1998000625A1 Drill bit with set of underreamer arms |
| 01/02/1998 | DE19625724A1 Drilling hammer unit using in sinking boreholes or driving piles |
| 12/30/1997 | CA2104010C Oil, gas or geothermal drilling apparatus |
| 12/24/1997 | WO1997048875A1 Down-the-hole hammer |
| 12/23/1997 | US5699867 Bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill |
| 12/17/1997 | EP0812976A2 Underground apparatus for directional drilling without earth removal |
| 12/17/1997 | EP0657006A4 Guided mole. |
| 12/17/1997 | EP0577664B1 A drilling equipment and a method for regulating its penetration |
| 12/16/1997 | US5697459 Directional self-propelled drill |
| 12/11/1997 | WO1997046787A1 A hydraulic device to be connected in a pipe string |
| 12/11/1997 | WO1997046785A1 Indexing percussive drilling bit |
| 12/11/1997 | DE19623016A1 Apparatus for trenchless laying of new underground communications and for reconstruction of existing communications |
| 12/11/1997 | CA2257210A1 Indexing percussive drilling bit |
| 12/10/1997 | EP0811744A1 Method and device for excavating a hole in underground formations |
| 12/09/1997 | US5695014 Ram boring apparatus |
| 11/27/1997 | WO1997044565A1 Downhole apparatus |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/25/1997 | US5690434 Downhole tool bearing assembly |
| 11/24/1997 | CA2206017A1 Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path |
| 11/21/1997 | CA2205783A1 Steerable boring machine |
| 11/20/1997 | WO1997043515A1 Drill bit retainer for a down hole hammer assembly |
| 11/18/1997 | US5687803 Method for reversing a ground piercing tool |
| 11/18/1997 | CA2058080C Composite stator construction for downhole drilling motors |
| 11/13/1997 | WO1997042392A1 Hammer device |
| 11/12/1997 | EP0806542A2 Steerable rotary drilling system |
| 11/11/1997 | US5685380 Reverse circulation down-the-hole drill |
| 11/06/1997 | WO1997041354A1 Bending rod connection |
| 11/06/1997 | CA2252685A1 Bending rod connection |
| 11/05/1997 | EP0805258A2 Reversible boring ram |
| 11/05/1997 | EP0805257A2 Guided drilling system with shock absorber |
| 11/04/1997 | CA2131859C Rotary piston well tool |
| 11/02/1997 | CA2204230A1 Reversible percussion piston drill apparatus |
| 10/30/1997 | DE19616751A1 Counterboring drill |
| 10/28/1997 | US5680904 In-the-hole percussion rock drill |
| 10/21/1997 | US5679894 Apparatus and method for drilling boreholes |
| 10/14/1997 | CA2071002C Hybrid pneumatic percussion rock drill |
| 10/09/1997 | DE19613352A1 Small-bore tunnel-driving machine |
| 10/07/1997 | US5673763 Modulated bias unit for rotary drilling |
| 09/26/1997 | CA2201058A1 A method and system for steering and guiding a drill |
| 09/18/1997 | WO1997034070A1 Device for drilling a bore hole in the ground |
| 09/18/1997 | DE19609899A1 Vorrichtung zur Herstellung eines Erdlochs Apparatus for producing a earthen hole |
| 09/16/1997 | US5667023 Method and apparatus for drilling and completing wells |
| 09/09/1997 | US5664891 Downhole bearing assembly which accommodates compressive and tensile axial |
| 09/06/1997 | CA2175411A1 Downhole bearing assembly which accommodates compressive and tensil axial loading |
| 09/04/1997 | WO1997032108A1 A drilling apparatus |
| 09/03/1997 | EP0640170A4 Improved drilling arrangement and method. |
| 09/02/1997 | US5662180 Percussion drill assembly |
| 08/28/1997 | WO1997019248A3 Downhole equipment |
| 08/20/1997 | CN1035684C Fluid-actuated percussive drilling apparatus |
| 08/13/1997 | EP0789129A2 Self-propelled boring ram |
| 08/13/1997 | CN2259482Y Three-unit and truck transmission gear for drilling machine |
| 08/13/1997 | CN2259481Y Controllable hydraulic pressure device |
| 07/30/1997 | EP0725757A4 Excavating equipment |
| 07/22/1997 | US5649745 Inflatable gripper assembly for rock boring machine |
| 07/22/1997 | US5649603 Downhole tools having circumferentially spaced rolling elements |
| 07/16/1997 | CN2257857Y Automatic pressurizing underwater electric drill |
| 07/15/1997 | US5647447 Bit retention device for a bit and chuck assembly of a down-the-hole percussive drill |
| 07/15/1997 | US5647445 Double piston in-the-hole hydraulic hammer drill |
| 06/24/1997 | US5641027 For drilling into surface rock |
| 06/19/1997 | WO1997021900A1 Fluid drilling system |
| 06/12/1997 | DE19617213C1 Bending shaft connection for pump rotor or drill head |
| 06/11/1997 | EP0778392A2 Method and apparatus for removing the uppermost part of a construction in the seabed |
| 06/11/1997 | EP0687340A4 Pressure reversing valve for percussive drilling apparatus |
| 06/11/1997 | EP0682737A4 Reversible casing for a down-the-hole percussive apparatus. |
| 06/04/1997 | EP0656985B1 Drill string anchor |
| 05/29/1997 | WO1997019248A2 Downhole equipment |
| 05/28/1997 | DE4143475C2 Percussion drill |
| 05/23/1997 | CA2186272A1 Double piston in-the-hole hydraulic hammer drill |
| 05/22/1997 | DE19542828A1 Continuous miller for mining coal, minerals, ore, rock or like |
| 05/21/1997 | EP0774563A2 Method and apparatus for navigational drilling |
| 05/21/1997 | EP0774041A1 Locking a sample tube in a downhole hammer |
| 05/14/1997 | EP0772728A1 Locomotive or tractor for pulling equipment in a pipe or drill hole |
| 05/09/1997 | WO1997016622A1 A drilling assembly, a coupling device for such drilling assembly, and a method of drilling holes in the underground using the drilling assembly |
| 05/02/1997 | EP0770759A2 A drilling assembly for use in drilling holes in subsurface formations |
| 05/02/1997 | EP0631645A4 Down reaming apparatus. |
| 04/30/1997 | DE19548835C1 Hammer-drilling device with control for forwards and backwards motion |
| 04/24/1997 | WO1997014866A1 Percussion drill assembly |
| 04/23/1997 | EP0712461A4 Rotary piston driving mechanism |
| 04/22/1997 | US5622231 Cutting head |
| 04/15/1997 | US5620056 Coupling for a downhole tandem drilling motor |
| 04/10/1997 | WO1997013053A1 Apparatus and method for milling a well casing |
| 04/09/1997 | EP0767289A1 Inflatable gripper assembly for rock boring machine |
| 04/09/1997 | CN2251615Y Down-the-hole drill |
| 04/03/1997 | WO1997012121A1 Subsurface pneumatic hammer |
| 04/03/1997 | WO1997012120A1 Subsurface pneumatic hammer |
| 04/03/1997 | CA2185495A1 Inflatable gripper assembly for rock boring machine |
| 04/02/1997 | EP0621919B1 Down-the-hole rock drill |
| 03/25/1997 | US5613568 Rock drilling machine |
| 03/20/1997 | DE19534696A1 Introducing measuring instruments into horizontal or sloping borehole |
| 03/18/1997 | CA2100085C Drilling process and device |
| 03/06/1997 | WO1997008418A1 Puller-thruster downhole tool |
| 02/27/1997 | WO1997007316A1 Scraper for removing an earth core from a pipe laid without excavation |
| 02/27/1997 | DE19530972A1 Automatic pile driver producing boreholes with reciprocating impact piston |
| 02/26/1997 | EP0759115A1 Device for controlling the drilling direction of drill bit |
| 02/25/1997 | CA2105474C Well orienting tool and/or thruster |
| 02/18/1997 | US5603385 Rotatable pressure seal |
| 02/18/1997 | US5603383 Reversible pneumatic ground piercing tool |