| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 02/13/1990 | US4899834 Electromagnetic drilling apparatus |
| 02/13/1990 | CA1265783A1 Tapered friction bearing assembly |
| 02/07/1990 | EP0353442A2 Method and boring ram for laying service lines without excavation |
| 02/07/1990 | EP0353400A2 Boring ram |
| 02/01/1990 | DE3902870A1 Method of sinking bores in subterranean rock formations |
| 01/31/1990 | EP0352427A2 Drilling device |
| 01/31/1990 | EP0352327A1 Pneumatically-operated percussion device |
| 01/23/1990 | CA1264733A1 Downhole hammer |
| 01/18/1990 | DE3839760C1 Double rotary drilling apparatus for making directionally accurate bores, in particular horizontal bores |
| 01/17/1990 | EP0350806A2 Soil displacement hammer |
| 01/09/1990 | US4892420 Friction bearing for deep well drilling tools |
| 01/08/1990 | EP0267920A4 Bearing and manufacture thereof. |
| 01/02/1990 | US4890682 Apparatus for vibrating a pipe string in a borehole |
| 12/26/1989 | US4889195 Drill bit direct drive for deep well drilling tools |
| 12/12/1989 | US4886128 Ram boring implement having a movable bit |
| 11/30/1989 | WO1989011580A1 Instrument for percussion-rotary drilling |
| 11/29/1989 | EP0343800A2 Apparatus for providing an underground tunnel |
| 11/29/1989 | EP0273974B1 Device for making holes in ground |
| 11/29/1989 | CN2048509U Hollow pneumatic cable core-taking hammer |
| 11/28/1989 | US4883133 Combustion operated drilling apparatus |
| 11/14/1989 | US4880067 Apparatus for drilling a curved borehole |
| 11/14/1989 | US4880066 Assembly for directional drilling of boreholes |
| 11/14/1989 | US4880065 Air motor operated rotary earth drilling tool |
| 11/09/1989 | DE3907637A1 Rodless drilling, pressure or cleaning implement |
| 11/08/1989 | EP0340280A1 Self-propelled subsoil penetrating tool system |
| 11/07/1989 | US4878550 Pilot-valve-controlled percussion drilling tool |
| 11/07/1989 | US4878547 Rock drilling apparatus |
| 11/01/1989 | CN1036811A Drill |
| 11/01/1989 | CN1005639B Trench excavator |
| 10/25/1989 | EP0338165A1 Pressure controlled tool for servicing operations in a pipeline |
| 10/24/1989 | US4876672 Ultrasonic logging tool with rotating exposed transducer |
| 10/24/1989 | US4875531 Core drilling tool with direct drive |
| 10/24/1989 | US4875523 Pipeline servicing tool |
| 10/24/1989 | CA1262454A1 Deep-borehole drilling device |
| 10/17/1989 | US4874268 Method and apparatus for building pipeline and shield tunnelling machine |
| 10/11/1989 | EP0336010A1 Percussion drill with interchangeable downhole or sideways discharging cutting or drilling head |
| 10/10/1989 | US4872516 Air driven impact operated ground piercing tool |
| 10/04/1989 | EP0335609A2 Soil displacement hammer |
| 10/04/1989 | EP0335543A1 Drilling apparatus |
| 10/03/1989 | US4871037 Excavation apparatus, system and method |
| 10/03/1989 | US4871034 Rammer |
| 09/26/1989 | CA1261819A1 Extraction device for pneumatically actuated drilling tools |
| 09/26/1989 | CA1260922A1 Air pressure impact drilling method and apparatus for same |
| 09/26/1989 | CA1260458A1 Annular air-hammer apparatus for drilling holes |
| 09/26/1989 | CA1260454A1 Annular air-hammer apparatus for drilling holes |
| 09/21/1989 | WO1989008769A1 Drill |
| 09/20/1989 | EP0333484A2 Flow pulsing apparatus for down-hole drilling equipment |
| 09/20/1989 | EP0333450A1 Downhole Stabilisers |
| 09/19/1989 | US4867255 Technique for steering a downhole hammer |
| 09/19/1989 | CA1259604A1 Motor driven tool |
| 09/19/1989 | CA1259502A1 Devices for imparting rotary motion |
| 09/13/1989 | EP0331978A2 Drill pipe for a hydraulic down-hole drill hammer |
| 09/13/1989 | EP0331913A2 Boring ram with a turn-and-pull reversing device |
| 09/12/1989 | US4866214 Service cable for a subsoil penetrating tool and method of preventing rotation of the cable when in use |
| 09/07/1989 | DE3806407A1 Arrangement for producing soil sections compacted with the addition of binding or sealing agents |
| 09/05/1989 | US4862976 Spline drive for percussion drilling tool |
| 09/05/1989 | US4862974 Downhole drilling assembly, apparatus and method utilizing drilling motor and stabilizer |
| 08/22/1989 | US4858704 Guided earth boring tool |
| 08/22/1989 | US4858703 Self-propelled subsoil penetrating tool system |
| 08/17/1989 | DE3803601A1 Pipe-advancement apparatus, in particular for advancing small-diameter pipes in the earth |
| 08/16/1989 | EP0328244A1 A drilling tool |
| 08/16/1989 | EP0327575A1 A pneumatic percussion hammer |
| 08/16/1989 | CN2042878U Hydraulic pressure diving drilling machine |
| 08/10/1989 | WO1989007192A1 Device for making wells in the ground |
| 08/10/1989 | DE3901921A1 Rodless multi-hole drilling and cutting unit |
| 08/08/1989 | US4854401 Drill bit direct drive for deep well drilling tools |
| 08/08/1989 | US4854397 System for directional drilling and related method of use |
| 08/02/1989 | EP0325715A2 Boring ram |
| 08/01/1989 | US4852672 Drill apparatus having a primary drill and a pilot drill |
| 08/01/1989 | US4852669 Directional downhole drill apparatus |
| 07/27/1989 | WO1989006737A1 A drilling tool |
| 07/27/1989 | WO1989006736A1 Boring ram |
| 07/27/1989 | DE3813236C1 Self-propelled ram borer |
| 07/26/1989 | EP0325393A1 Boring ram |
| 07/25/1989 | CA1257865A1 Sealing means for lubricant chambers in down-hole drilling tools |
| 07/18/1989 | CA1257515A1 Reversible percussive action machine |
| 07/05/1989 | EP0323433A1 Device for the underground installation of pipes or the like |
| 07/04/1989 | US4844180 Downhole drilling motor |
| 06/29/1989 | DE3741717A1 Vorrichtung zum niederbringen von im wesentlichen vertikalen bohrungen Apparatus for bringing down of substantially vertical holes |
| 06/28/1989 | EP0322170A2 Earth boring apparatus with control valve |
| 06/27/1989 | US4842207 Device for detecting and measuring the tension on a cable |
| 06/27/1989 | US4842081 Simultaneous drilling and casing device |
| 06/20/1989 | US4840517 Soil displacement tools |
| 06/20/1989 | US4840237 Ram boring implement |
| 06/20/1989 | US4840235 Impact hammer assembly for drilling rock |
| 06/20/1989 | US4840234 Pneumatic ram boring machine |
| 06/15/1989 | WO1989005391A1 Device for drilling essentially vertical boreholes |
| 06/13/1989 | CA1255651A1 Steering and control system for percussion boring tools |
| 06/01/1989 | DE3839154A1 Bohrmeissel A drill bit |
| 05/30/1989 | US4834580 Method and device for driving a tunnel |
| 05/30/1989 | US4834193 Earth boring apparatus and method with control valve |
| 05/30/1989 | US4833974 Ram boring machine |
| 05/24/1989 | EP0316747A2 Method and apparatus for building pipeline |
| 05/24/1989 | EP0174972B1 Hammer for use in a bore hole and apparatus for use therewith |
| 05/18/1989 | WO1989004418A1 Self-propelled subsoil penetrating tool system |
| 05/16/1989 | US4830520 Method of protecting a limited-displacement mechanical system against an agressive medium |
| 05/09/1989 | US4828053 Deviated wellbore drilling system and apparatus |
| 05/09/1989 | US4828048 Hydraulic Percussion tool |
| 04/26/1989 | EP0312926A1 Rock drill |
| 04/25/1989 | US4823889 Downhole screw motor |