| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 04/19/1989 | CN2036204U Valveless void core taking multipurpose hole hammer |
| 04/18/1989 | US4821813 Percussion drilling apparatus |
| 04/18/1989 | US4821812 Down hole drill improvement |
| 04/11/1989 | US4819746 Reverse circulation down-the-hole hammer drill and bit therefor |
| 04/11/1989 | US4819741 Reversiele percussion device |
| 04/11/1989 | US4819739 Fluid actuated rock drill hammer |
| 03/14/1989 | EP0265521A4 Rotor of downhole screw motor, method and device for making thereof. |
| 03/09/1989 | WO1989002011A1 Pneumatically-operated percussion device |
| 03/09/1989 | WO1989001837A1 Rotating, radially impacting rollers, balls or similar for excavating/milling of rocks or other materials |
| 03/07/1989 | US4810105 Bearing sleeves |
| 03/07/1989 | CA1250828A1 Downhole screw motor |
| 03/01/1989 | CN2033437U Hydraulic pressure water tap |
| 02/22/1989 | EP0303635A1 System with a hydraulic lifting generator for earth drilling. |
| 02/16/1989 | DE3726014A1 High-pressure deep-hole hammer drill, for example for injection holes |
| 02/02/1989 | DE3724619A1 Boring ram |
| 02/01/1989 | EP0301287A2 Boring ram |
| 01/26/1989 | WO1989000638A1 Hydraulic down-the-hole rock drill |
| 01/17/1989 | CA1248825A1 Reversible pneumatic underground piercing tool |
| 01/12/1989 | DE3721526A1 Rotary drilling rig for producing cased boreholes |
| 01/11/1989 | EP0298537A2 Device and method for underreaming a borehole |
| 01/10/1989 | US4796723 System for transmitting energy through an apparatus usable for subsoil prospection, lowered inside a well or drill hole |
| 01/10/1989 | US4796713 Activated earth drill |
| 01/10/1989 | CA1248364A1 Down-hole devices for imparting rotary motion |
| 12/29/1988 | WO1988010393A1 Apparatus for working in pipes |
| 12/28/1988 | CN87103924A Secondary-controlled shock unit |
| 12/13/1988 | US4790391 Air pressure impact drilling method and apparatus for same |
| 11/29/1988 | US4787457 Method and apparatus for rotating casing string segment |
| 11/22/1988 | US4785898 Device for making holes in soil |
| 11/22/1988 | CA1245212A1 Method and system of drilling deviated wellbores |
| 11/17/1988 | EP0291011A1 Rerounding apparatus |
| 11/17/1988 | EP0290839A2 PCD Enhanced radial bearing |
| 11/09/1988 | CN88102386A Hammer drills for making boreholes |
| 11/01/1988 | CA1244000A1 Guided earth boring tool |
| 11/01/1988 | CA1243911A1 Reversible air-operated percussive action machine for driving holes in the ground |
| 10/27/1988 | DE3712458A1 Cam mechanism with constant transmission ratios for restricted spaces |
| 10/26/1988 | EP0288180A2 Down-the-hole drill hammer |
| 10/26/1988 | EP0288123A2 Downhole drilling motor |
| 10/19/1988 | EP0287155A2 Assembly for directional drilling of boreholes |
| 10/12/1988 | EP0286373A2 Bit retaining ring for recovering drill string components |
| 10/06/1988 | DE3809768A1 Method and apparatus for extraction underground |
| 10/05/1988 | EP0284759A1 Hammer |
| 10/04/1988 | US4775017 Drilling using downhole drilling tools |
| 09/28/1988 | EP0283982A2 Sliding-contact bearing for a deep-drilling tool |
| 09/28/1988 | EP0283981A2 Direct bit drive for a deep-drilling tool |
| 09/28/1988 | EP0283980A2 Direct bit drive for a deep-drilling tool |
| 09/28/1988 | EP0283734A2 Percussive drilling apparatus with movable hammer head |
| 09/27/1988 | US4773489 Core drilling tool for boreholes in rock |
| 09/20/1988 | US4772246 Downhole motor drive shaft universal joint assembly |
| 09/20/1988 | US4771835 Downhole hammer |
| 09/20/1988 | CA1242183A1 Downhole sectional screw motor and method of oriented assembly of working members thereof using a mounting fixture |
| 09/15/1988 | DE3706755A1 Drilling head of a horizontal driving machine for controlled line-tunnel construction in the non-man-sized diameter range |
| 09/14/1988 | CN88100959A Drill-hole device with hydraulic impacting generator |
| 09/13/1988 | US4770255 Arrangement for underwater drilling of foundations |
| 09/13/1988 | US4770030 Soil penetration and sampling system |
| 09/07/1988 | WO1988006673A1 System with a hydraulic lifting generator for earth drilling |
| 09/06/1988 | US4768888 Unitary bearing member and motor incorporating the same |
| 09/06/1988 | US4768598 Fluid pressure actuated bypass and pressure indicating relief valve |
| 09/06/1988 | CA1241635A1 Drive device for a drill bit |
| 08/31/1988 | EP0279835A1 Bearing structure for downhole motors |
| 08/24/1988 | EP0278978A1 Downhole motor bearing assembly |
| 08/23/1988 | US4765418 Borehole drill construction |
| 08/23/1988 | CA1240983A1 Downhole retrievable drill bit |
| 08/18/1988 | DE3802391A1 Device for retrieving pneumatically actuated percussion tools from boreholes |
| 08/16/1988 | US4764094 Screw machine having a plurality of symmetrically arranged rotors |
| 08/16/1988 | US4764036 PCD enhanced radial bearing |
| 08/10/1988 | EP0277861A1 Screw-type hydraulic motors |
| 08/04/1988 | DE3702144A1 Percussion drilling unit for rotary percussion drilling in minerals, rocks and ores |
| 08/03/1988 | EP0276724A2 Core drilling tool with a direct drive |
| 08/03/1988 | CN87100447A Down hole drill improvement |
| 07/19/1988 | US4757878 Method and system for lubrication |
| 07/19/1988 | US4757861 Oil well sucker rod coupling assembly |
| 07/13/1988 | EP0273974A1 Device for making holes in ground |
| 07/13/1988 | CN87211037U Telescopic seismic-transmitting unit |
| 07/13/1988 | CN87208690U Twice-controlled battering device |
| 07/12/1988 | US4756644 Rerounding apparatus |
| 07/06/1988 | EP0273139A2 Boring ram |
| 06/28/1988 | US4753485 Recovering minerals from a subsurface earth formation |
| 06/28/1988 | US4753302 Valveless pneumatic hammer |
| 06/22/1988 | EP0271631A1 Ramming and drilling apparatus |
| 06/14/1988 | CA1238035A1 Hammer for use in a bore hole and apparatus for use therewith |
| 06/08/1988 | EP0170681B1 Downhole motor and bearing assembly |
| 06/07/1988 | US4749050 Through the ground |
| 06/07/1988 | CA1237588A1 Oscillating antifriction ring for use as thrust bearing |
| 05/31/1988 | US4747466 Impact tool |
| 05/31/1988 | CA1237420A1 Percussive action machine for making holes in the ground |
| 05/25/1988 | EP0268568A1 Method and device for driving a tunnel |
| 05/25/1988 | EP0267920A1 Bearing and manufacture thereof |
| 05/17/1988 | US4744426 Apparatus for reducing hydro-static pressure at the drill bit |
| 05/17/1988 | CA1236825A1 Method and apparatus for selectively straight or directional drilling in subsurface rock formations |
| 05/11/1988 | EP0266386A1 Improvements in drilling using downhole drilling tools. |
| 05/10/1988 | US4742876 Submarine drilling device |
| 05/05/1988 | WO1988003220A1 A pneumatic percussion hammer |
| 05/04/1988 | EP0265521A1 Rotor of downhole screw motor, method and device for making thereof |
| 05/04/1988 | CN87104794A Gang drill construction |
| 04/27/1988 | EP0264444A1 Downhole screw motor |
| 04/21/1988 | DE3634923A1 Pneumatic piercing hammer |
| 04/19/1988 | CA1235313A1 Device for remote transmission of information |
| 04/13/1988 | EP0263281A1 Pneumatic boring ram |
| 04/13/1988 | EP0263109A1 Tapered friction bearing assembly |
| 04/13/1988 | CN85102035B Drilling tool with two styles of dust removing |