| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 09/06/1995 | CN1029700C An apparatus and method for removing debris from a drillhole |
| 09/05/1995 | US5447472 Articulated coupling for use with a progressive cavity apparatus |
| 09/05/1995 | CA2020388C Multiple blow percussion drill assembly with rapid field maintenance and adjustment capability |
| 08/17/1995 | WO1995021987A1 Locomotive or tractor for pulling equipment in a pipe or drill hole |
| 08/17/1995 | WO1995021984A1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 08/17/1995 | DE4404712A1 Verfahren zum Ausbau eines Erdkerns aus einem grabenlos verlegten Rohr und Molch zur Durchführung des Verfahrens A method for removing a soil core from a trenchless laid pipe and pigging for performing the method |
| 08/15/1995 | US5440797 Method for making a pneumatic ground piercing tool |
| 07/25/1995 | US5435402 Self-propelled earth drilling hammer-bit assembly |
| 07/25/1995 | US5435401 Down-the-hole rock drill |
| 07/20/1995 | WO1995019488A1 Downhole motor for a drilling apparatus |
| 07/06/1995 | WO1995018287A1 Control device for drilling a bore hole |
| 07/05/1995 | CN2202793Y Closing type less gear difference speed reducer under well |
| 07/04/1995 | US5429198 Down reaming apparatus having hydraulically controlled stabilizer |
| 06/27/1995 | US5427190 Underground borer with down hammer |
| 06/22/1995 | WO1995016848A1 An in-hole rock drilling machine |
| 06/22/1995 | WO1995016847A1 A hydraulic impact motor |
| 06/21/1995 | EP0658681A2 Drill hammer |
| 06/21/1995 | CN2201480Y Round pile drill with automatic horizontally picking core |
| 06/21/1995 | CN2201479Y Underwater driller |
| 06/20/1995 | US5425429 Method and apparatus for forming lateral boreholes |
| 06/16/1995 | CA2138086A1 Pneumatic drill hammer |
| 06/14/1995 | EP0657006A1 Guided mole |
| 06/14/1995 | EP0656985A1 Drill string anchor. |
| 06/14/1995 | EP0406411B1 Down-hole mud actuated hammer |
| 06/14/1995 | CN2200691Y Pneumatic underground punching machine |
| 06/13/1995 | US5423636 Cement soil apparatus of underground borer |
| 06/08/1995 | CA2110887A1 Method and apparatus for densification of sands or silts |
| 05/31/1995 | CN2199304Y Diving-type rolling rubbing circular pile drill |
| 05/30/1995 | US5419403 Pneumatic hammer |
| 05/09/1995 | US5413185 Soil displacement hammer with movable head |
| 05/09/1995 | CA1335500C Downhole stabilisers |
| 04/26/1995 | EP0506850B1 Hybrid pneumatic percussion rock drill |
| 04/20/1995 | WO1995010683A1 Down reaming apparatus |
| 04/20/1995 | CA2173870A1 Down reaming apparatus |
| 04/18/1995 | US5407021 Down-the-hole hammer drill having reverse circulation |
| 04/04/1995 | US5404061 Oil-filled motor protector |
| 04/04/1995 | US5402854 Fluid distributor for a debris flushing system in a percussive, fluid-activated apparatus |
| 03/30/1995 | WO1995008690A1 Make up system of a down-the-hole hammer |
| 03/23/1995 | DE4332113A1 Boring implement for making bores in earth with different soil classes |
| 03/22/1995 | CN1027986C Screw driller rotor by surface nitrogen treatment |
| 03/16/1995 | WO1995002093A3 Apparatus and method |
| 03/14/1995 | US5396965 For use in a drill string |
| 03/07/1995 | US5394951 Bottom hole drilling assembly |
| 03/01/1995 | EP0640170A1 Improved drilling arrangement and method |
| 02/21/1995 | US5390749 Apparatus for positioning a split retaining ring in a down-hole percussive drill |
| 02/14/1995 | US5388649 Drilling equipment and a method for regulating its penetration |
| 02/09/1995 | WO1995004207A1 Rotary piston driving mechanism |
| 02/09/1995 | CA2168758A1 Rotary piston driving mechanism |
| 02/02/1995 | WO1995003471A1 Elastomeric joint and articulated coupling and progressive cavity device using the same |
| 02/01/1995 | EP0636202A1 Use of pressurized medium in drilling. |
| 02/01/1995 | CN1098162A Underground border with down hammer |
| 01/31/1995 | US5385407 Bearing section for a downhole motor |
| 01/19/1995 | WO1995002093A2 Apparatus and method |
| 01/18/1995 | EP0634559A2 Fluid driven down-the-hole drilling machine |
| 01/13/1995 | CA2127235A1 Fluid driven down-the-hole drilling machine |
| 01/04/1995 | EP0631645A1 Down reaming apparatus |
| 01/03/1995 | US5377771 Sealed bearing assembly used in earth drilling |
| 01/03/1995 | US5377770 For tunneling through the ground |
| 01/03/1995 | US5377551 Probe for penetrating and displacing particularly into a mass of pulverulent material |
| 12/27/1994 | US5375668 Borehole, as well as a method and an apparatus for forming it |
| 12/21/1994 | EP0394255B1 Hydraulic down-the-hole rock drill |
| 12/20/1994 | US5373898 Rotary piston well tool |
| 12/08/1994 | WO1994021889A3 Improvements in or relating to drilling and to the extraction of fluids |
| 12/07/1994 | EP0627543A2 Underground borer with down hammer |
| 11/30/1994 | CN1095788A Reversible casing for a down-the-hole percussive apparatus |
| 11/29/1994 | US5368398 For a downhole motor |
| 11/29/1994 | US5368110 Downhole rotary bearing sub |
| 11/29/1994 | US5368109 Apparatus for arcuate drilling |
| 11/24/1994 | WO1994027022A1 Rock drilling machine |
| 11/24/1994 | DE4415281A1 Fluid-actuated impact hammer |
| 11/24/1994 | CA2161424A1 Rock drilling machine |
| 11/17/1994 | EP0624706A2 Directional drilling system with integrated formation evaluation logging tool |
| 11/15/1994 | US5364192 Diamond bearing assembly |
| 11/15/1994 | US5363929 Downhole fluid motor composite torque shaft |
| 11/13/1994 | CA2123273A1 Steerable motor system with integrated formation evaluation logging capacity |
| 11/08/1994 | CA2061216C Short stack bearing assembly |
| 11/02/1994 | EP0621919A1 Down-the-hole rock drill. |
| 11/02/1994 | CN1094488A 轴承组件 Bearing Components |
| 10/27/1994 | WO1994024405A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 10/27/1994 | CA2160151A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 10/26/1994 | CN1094119A A pressure reversing valve for a fluid-actuated, percussive drilling apparatus |
| 10/18/1994 | US5355966 Drilling method and an assembly for performing the method |
| 10/14/1994 | WO1993020322A1 Liquid-driven downhole hammer drill |
| 10/14/1994 | CA2133425A1 Liquid-driven downhole hammer drill |
| 10/13/1994 | WO1994023171A1 Percussion drilling improvements |
| 10/12/1994 | CN2179453Y Vibrating hammer with hidden holes |
| 10/04/1994 | US5351766 Flow restricter for mud lubricated earth drilling motors |
| 09/29/1994 | WO1994021889A2 Improvements in or relating to drilling and to the extraction of fluids |
| 09/29/1994 | CA2158637A1 Improvements in or relating to drilling and the extraction of fluids |
| 09/28/1994 | EP0617207A2 Bearing assembly |
| 09/27/1994 | US5350390 Device for removal of intraluminal occlusions |
| 09/27/1994 | US5350242 Bearing assembly for a downhole motor |
| 09/27/1994 | US5350023 Pneumatic hammer |
| 09/27/1994 | CA2119981A1 Bearing assembly |
| 09/21/1994 | CN1025967C Blade type under well power drilling tool |
| 09/15/1994 | WO1994020725A1 Pressure reversing valve for percussive drilling apparatus |
| 09/06/1994 | US5343964 Petroleum, gas or geothermal driling apparatus |
| 09/01/1994 | WO1994019272A1 Excavating equipment |
| 09/01/1994 | CA2155312A1 Excavating equipment |
| 08/31/1994 | EP0612370A1 A steerable drilling assembly for mounting on the end of a drill string to drill a borehole in an underground formation |