| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 02/05/1997 | EP0757155A1 Earth drilling device |
| 02/05/1997 | CA2182729A1 Ground drilling apparatus |
| 01/22/1997 | EP0605562B1 Apparatus and method for removing drillhole debris |
| 01/15/1997 | EP0608316B1 Wing motor |
| 01/14/1997 | US5592866 For converting longitudinal reciprocating motion to longitudinal motion |
| 01/08/1997 | EP0752046A1 Stabilisation devices for drill motors |
| 01/08/1997 | EP0584131B1 Soil displacement hammer with movable head |
| 01/07/1997 | CA2033779C Sealing system for a sealed bearing assembly used in earth drilling |
| 12/31/1996 | US5588818 Rotor-to-rotor coupling |
| 12/10/1996 | US5582259 Modulated bias unit for rotary drilling |
| 12/04/1996 | EP0745175A1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 11/26/1996 | US5577564 Rotary fluid converter |
| 11/20/1996 | EP0678151B1 Downhole roller vane motor and roller vane pump |
| 10/22/1996 | US5566771 Reversible casing for a self-lubricating, fluid-actuated, percussive down-the-hole drill |
| 10/22/1996 | CA2001262C Rock drilling method and apparatus |
| 10/21/1996 | CA2174017A1 Rotor-to-rotor coupling |
| 10/18/1996 | CA2174014A1 Universal drive shaft coupling |
| 10/16/1996 | EP0737268A1 Control device for drilling a bore hole |
| 10/15/1996 | US5564510 Pneumatic drill hammer |
| 10/09/1996 | EP0736128A1 Downhole motor for a drilling apparatus |
| 10/08/1996 | US5562170 Self-lubricating, fluid-actuated, percussive down-the-hole drill |
| 10/03/1996 | WO1996030616A1 Device for controlling the drilling direction of drill bit |
| 10/01/1996 | US5560716 Bearing assembly |
| 09/26/1996 | WO1996029520A1 Retention means |
| 09/25/1996 | EP0733153A1 A hydraulic impact motor |
| 09/25/1996 | EP0733152A1 An in-hole rock drilling machine |
| 09/25/1996 | EP0572475B1 Drill head with integral impact hammers |
| 09/24/1996 | US5558167 Percussion boring machine |
| 09/11/1996 | EP0731248A1 Percussion tool |
| 09/11/1996 | EP0565662B1 Drilling process and device |
| 09/10/1996 | US5553679 Modulated bias unit for rotary drilling |
| 09/10/1996 | US5553678 Modulated bias units for steerable rotary drilling systems |
| 08/14/1996 | EP0725757A1 Excavating equipment |
| 08/06/1996 | US5542484 Liquid reciprocating piston hammer drilling arrangement without cavitation |
| 07/30/1996 | US5540294 Vertical percussion ground boring tool apparatus and method |
| 07/04/1996 | WO1996020330A1 Drilling apparatus |
| 07/02/1996 | US5531280 Drill string anchor |
| 06/26/1996 | EP0524183B1 A borehole, as well as a method and an apparatus for forming it |
| 06/19/1996 | EP0636202B1 Use of pressurized medium in drilling |
| 06/19/1996 | CN1032078C Vane-type power drilling tool for well |
| 06/18/1996 | US5527220 Articulatable joint with multi-faceted ball and socket |
| 06/18/1996 | US5526887 Device for drilling holes in the crust of the earth, especially for drilling oil wells |
| 06/11/1996 | US5524717 Method of using a pressurized medium in drilling |
| 06/04/1996 | CA2079071C Method and apparatus for drilling bore holes under pressure |
| 06/04/1996 | CA2029822C Pneumatic ground-piercing tool |
| 05/29/1996 | EP0713951A2 Method of drilling and completing wells |
| 05/28/1996 | US5520255 Modulated bias unit for rotary drilling |
| 05/23/1996 | WO1996015349A1 A method to drill a hole with a hammer, the hammer and a joint between hammer and drill bit holder |
| 05/22/1996 | EP0712461A1 Rotary piston driving mechanism |
| 05/21/1996 | US5518379 For rotating a tool |
| 05/15/1996 | EP0584330B1 Reversible bit bearing for percussion drill |
| 05/01/1996 | EP0708864A1 Apparatus and method |
| 04/30/1996 | US5511628 Pneumatic drill with central evacuation outlet |
| 04/30/1996 | US5511626 Hydraulically operated subsoil displacement apparatus |
| 04/17/1996 | EP0531439B1 Soil displacement hammer with reversing mechanism |
| 04/09/1996 | US5505270 Reversible pneumatic ground piercing tool |
| 03/29/1996 | CA2147431A1 Self-propelled earth drilling hammer-bit assembly |
| 03/27/1996 | EP0703345A2 Boring ram |
| 03/12/1996 | US5498081 Bearing assembly incorporating shield ring precluding erosion |
| 03/12/1996 | US5497839 Liquid-driven downhole hammer drill |
| 03/05/1996 | US5495900 Drill string deflection sub |
| 02/27/1996 | US5494401 Orifice motor |
| 02/27/1996 | US5494119 In percussion type downhole drilling equipment |
| 02/27/1996 | US5494116 Pneumatic impact tool for pipe insertion |
| 02/15/1996 | WO1996004459A1 Locking a sample tube in a downhole hammer |
| 02/15/1996 | WO1996004455A1 Inner sleeve for a fluid operated piston type hammer |
| 02/15/1996 | CA2180724A1 Locking a sample tube in a downhole hammer |
| 02/06/1996 | US5488998 Fluid driven down-the-hole drilling machine |
| 01/30/1996 | US5487430 Pneumatic ground-piercing tool and body therefor |
| 01/17/1996 | EP0692062A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 01/17/1996 | EP0692061A1 Percussion drilling improvements |
| 01/17/1996 | EP0543806B1 Hydraulic down-the-hole rock drill |
| 01/16/1996 | US5484016 For use in removing material buildup from an inner surface |
| 01/02/1996 | US5480233 Thrust bearing for use in downhole drilling systems |
| 12/20/1995 | EP0687340A1 Pressure reversing valve for percussive drilling apparatus |
| 12/13/1995 | EP0578690B1 Oil, gas or geothermal drilling apparatus |
| 12/06/1995 | EP0685627A2 A modulated bias unit for rotary drilling |
| 12/06/1995 | EP0685626A2 A modulated bias unit for rotary drilling |
| 12/06/1995 | EP0685625A2 A modulated bias unit for rotary drilling |
| 12/06/1995 | EP0685624A2 A modulated bias unit for rotary drilling |
| 12/06/1995 | EP0685623A2 A rotatable pressure seal |
| 12/05/1995 | US5472057 Drilling with casing and retrievable bit-motor assembly |
| 12/05/1995 | CA2150734A1 Modulated bias unit for rotary drilling |
| 12/05/1995 | CA2150732A1 Modulated bias unit for rotary drilling |
| 12/05/1995 | CA2150731A1 Modulated bias unit for rotary drilling |
| 11/23/1995 | DE4433533C1 Hydraulic ram=type drill |
| 11/22/1995 | EP0682737A1 Reversible casing for a down-the-hole percussive apparatus |
| 11/21/1995 | US5467831 Monotube differential pneumopercussive reversible self-propelled soil penetrating machine with stabilizers |
| 11/21/1995 | US5467684 Rotary piston driving mechanism |
| 11/14/1995 | US5465797 Pneumatic ground piercing tool with detachable head |
| 11/02/1995 | EP0524259B1 Hammer device |
| 10/25/1995 | EP0678151A1 Downhole roller vane motor and roller vane pump. |
| 10/24/1995 | US5460496 Wing motor having non-radial roller slats |
| 10/18/1995 | EP0677640A1 Improvements in or relating to steerable rotary drilling systems |
| 10/17/1995 | US5458208 Directional drilling using a rotating slide sub |
| 10/10/1995 | US5456106 Down hole assembly |
| 10/03/1995 | CA1337192C Fluid operated vibratory jar with rotating bit |
| 09/28/1995 | WO1995025872A1 Stabilisation devices for drill motors |
| 09/20/1995 | EP0672818A1 Modular measurement while drilling sensor assembly |
| 09/13/1995 | CN2207438Y Sneak rocker arm rolling-scrubbing square pile driller |