| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 04/12/1988 | US4736987 Rock cutting assembly |
| 03/30/1988 | EP0261136A1 Bearing assembly |
| 03/29/1988 | US4733731 Air-operated reversible percussive action machine |
| 03/22/1988 | US4732491 Downhole motor bearing assembly |
| 03/22/1988 | US4732226 Drilling machine |
| 03/22/1988 | US4732225 Deep-borehole drilling device with magnetic coupling |
| 03/22/1988 | US4732222 Ram boring machine with impact blade piston |
| 03/10/1988 | WO1988001702A1 Bearing structure for downhole motors |
| 03/10/1988 | WO1988001701A1 Downhole motor bearing assembly |
| 03/08/1988 | US4729675 Downhole motor and bearing assembly |
| 03/08/1988 | US4729440 Transistion layer polycrystalline diamond bearing |
| 03/08/1988 | US4729439 For rock boring and the like |
| 03/02/1988 | EP0257744A2 Drilling system |
| 03/01/1988 | US4727944 Percussion drill string assembly |
| 02/23/1988 | US4726429 Percussion down hole drilling tool with central fluid flushing passage |
| 02/23/1988 | CA1233164A1 Joint device in extension drill equipment for percussive drilling |
| 02/16/1988 | US4725197 Devices for imparting rotary motion |
| 02/10/1988 | EP0255536A1 Drill tool |
| 02/02/1988 | US4722403 Annular air-hammer apparatus for drilling holes |
| 02/02/1988 | US4722402 Electromagnetic drilling apparatus and method |
| 01/26/1988 | US4721172 Apparatus for controlling the force applied to a drill bit while drilling |
| 01/20/1988 | EP0252932A1 Deep hole hammer |
| 01/19/1988 | US4720199 Bearing structure for downhole motors |
| 01/13/1988 | EP0162878B1 Improvements in pipe laying and replacement |
| 01/12/1988 | US4718504 Trench excavator |
| 01/05/1988 | CA1230979A1 Rotary cutter for cable following apparatus |
| 12/30/1987 | CN87207985U Pneumatic down-hole impact drilling tool |
| 12/30/1987 | CN87205846U Impact hammer device for bottom of hole |
| 12/22/1987 | US4714403 Down-hole devices for imparting rotary motion |
| 12/15/1987 | CA1230326A1 Downhole motor and bearing assembly |
| 12/08/1987 | US4711309 Drilling apparatus |
| 12/08/1987 | US4711006 Downhole sectional screw motor, mounting fixture thereof and method of oriented assembly of working members of the screw motor using the mounting fixture |
| 12/08/1987 | CA1230023A1 Reversible percussive action machine |
| 12/03/1987 | WO1987007342A1 Diamond bearing and manufacture thereof |
| 12/02/1987 | EP0247767A2 Method and apparatus for controlling the direction of a down-hole percussion drilling tool |
| 12/01/1987 | US4710036 In a downhole earth boring motor |
| 12/01/1987 | US4709768 Annular air hammer apparatus for drilling wells |
| 11/24/1987 | US4708496 Diamond bearing and manufacture thereof |
| 11/24/1987 | US4708213 Hydraulic core cutting motor |
| 11/24/1987 | US4708211 Reversible air-operated percussive action machine for driving holes in the ground |
| 11/19/1987 | EP0245892A2 Apparatus for vibrating a pipe string in a borehole |
| 11/19/1987 | EP0245414A1 Handling device |
| 11/18/1987 | CN87103385A Borehole drill construction |
| 11/17/1987 | CA1229268A1 Machine for driving holes in the ground |
| 11/11/1987 | EP0244986A2 Borehole drill construction |
| 11/10/1987 | US4705120 Drilling machine |
| 11/10/1987 | US4705119 Annular air-hammer apparatus for drilling holes |
| 11/10/1987 | US4705118 Hammer for use in a bore hole and apparatus for use therewith |
| 11/10/1987 | US4705117 Method and apparatus for reducing drill bit wear |
| 11/07/1987 | CN85204567U Hidden-hole pneumatic drill using combined exhaust |
| 11/05/1987 | WO1987006638A1 Device for making holes in ground |
| 11/04/1987 | EP0244076A2 Downhole circulation pump |
| 10/28/1987 | EP0242728A2 Coring tool for rock drilling |
| 10/28/1987 | CN86104793A Power-driven tool |
| 10/22/1987 | WO1987006300A1 Improvements in drilling using downhole drilling tools |
| 10/21/1987 | EP0242307A1 Device for the under water drilling of foundations |
| 10/20/1987 | US4700788 Directional drilling pipelay |
| 10/14/1987 | EP0241354A1 Device for simultaneously drilling and casing |
| 10/08/1987 | DE3610853A1 Drilling tool |
| 10/06/1987 | US4698794 Device for remote transmission of information |
| 10/06/1987 | US4697647 Reversible percussive action machine |
| 09/24/1987 | WO1987005673A1 Bearing assembly |
| 09/22/1987 | US4694915 Slotted wall milling cutter |
| 09/22/1987 | US4694913 Guided earth boring tool |
| 09/22/1987 | US4694911 Drilling assembly for percussion drilling of deep wells |
| 09/15/1987 | US4693326 Cycloidal earth cutting system with rocker-type nutating action |
| 09/08/1987 | CA1226532A1 Replacing mains |
| 09/08/1987 | CA1226488A1 Down the hole hammer equipment |
| 09/01/1987 | US4690225 Percussive tool |
| 08/19/1987 | EP0233038A2 Down-the-hole-drill |
| 08/19/1987 | EP0232891A2 Drilling tool for deep wells |
| 08/19/1987 | EP0232421A1 Screw machine |
| 08/13/1987 | WO1987004753A1 Rotor of downhole screw motor, method and device for making thereof |
| 08/04/1987 | US4683964 Downhole drill bit drive apparatus |
| 08/04/1987 | US4683960 Air-operated reversible percussive action machine |
| 07/30/1987 | WO1987004487A1 Drill tool |
| 07/30/1987 | WO1987004486A1 Tapered friction bearing assembly |
| 07/28/1987 | US4682660 Hydro-drill with circular impression |
| 07/28/1987 | CA1224682A1 Downhole drilling hammer |
| 07/21/1987 | CA1224456A1 Drill bit downhole drive apparatus |
| 07/16/1987 | WO1987004216A1 Deep hole hammer |
| 07/16/1987 | WO1987004215A1 Downhole screw motor |
| 07/14/1987 | US4679638 Downhole progressive cavity type drilling motor with flexible connecting rod |
| 07/14/1987 | US4679636 Method and apparatus for coring rock |
| 07/07/1987 | US4678045 Turbine tool |
| 07/07/1987 | CA1223863A1 Downhole motor fluid flow restrictor |
| 07/02/1987 | DE3546255A1 Tieflochhammer Deep hole hammer |
| 06/30/1987 | US4676725 Moineau type gear mechanism with resilient sleeve |
| 06/30/1987 | US4676716 Hydraulic multistage turbine of turbodrill |
| 06/23/1987 | US4674914 Replacing mains |
| 06/16/1987 | US4673312 Method and apparatus for the underground installation of pipelines |
| 06/10/1987 | EP0224859A1 Air driven impact operated ground piercing tool |
| 06/02/1987 | US4669555 Downhole circulation pump |
| 05/26/1987 | US4667737 Sealing apparatus |
| 05/21/1987 | WO1987003063A1 Handling device |
| 05/21/1987 | DE3539897A1 Method and arrangement for producing underground structural objects guided rectilinearly in a closed profile, in particular tunnel-like structures under the turf level, by pressing tube elements into the ground |
| 05/19/1987 | US4665997 Pressure balanced bearing assembly for downhole motors |
| 05/06/1987 | EP0220318A1 Downhole screw motor |
| 05/05/1987 | US4662457 Reversible underground piercing device |
| 05/05/1987 | US4662023 Ice removal auger for ice condenser containment |