| Patents for E21B 3 - Rotary drilling (4,061) |
|---|
| 07/04/1989 | US4844181 Floating sub |
| 06/28/1989 | CN2040138U Rocking arm type hydraulic pitting machine |
| 05/30/1989 | US4834594 Drill steel drive unit |
| 05/23/1989 | US4832552 Method and apparatus for rotary power driven swivel drilling |
| 05/16/1989 | US4830119 Top head drive cooling system |
| 04/27/1989 | DE3734513A1 Clamping head for the drive-transmission clamping of the pipe string in drilling work |
| 04/26/1989 | EP0312926A1 Rock drill |
| 04/18/1989 | US4821814 Top head drive assembly for earth drilling machine and components thereof |
| 04/12/1989 | EP0311455A1 Compact casing tongs for use on top head drive earth drilling machine |
| 03/28/1989 | US4815546 Top head drive assembly with axially movable quill |
| 03/21/1989 | US4813493 Hydraulic top drive for wells |
| 03/16/1989 | DE3730045A1 Pneumatically operated pivotting vane motor |
| 03/09/1989 | DE3802443C1 Rotary rock-drilling machine with device for releasing stuck drill rods |
| 03/07/1989 | US4809792 Support system for a top driven drilling unit |
| 01/31/1989 | US4800968 Well apparatus with tubular elevator tilt and indexing apparatus and methods of their use |
| 01/25/1989 | EP0300874A1 Machine for drilling by way of rotation and by alternating rotation |
| 12/20/1988 | US4791999 Well drilling apparatus |
| 12/08/1988 | DE3809626A1 Mobile drilling rig |
| 12/08/1988 | DE3809613A1 Device for attaching a casing machine to a vehicle |
| 11/29/1988 | CA1245621A1 Apparatus for use in drilling |
| 11/22/1988 | US4785892 Pile driver, pile drawer and/or drilling machine |
| 11/17/1988 | WO1988008069A3 Apparatus for use in drilling |
| 11/01/1988 | US4781359 Sub assembly for a swivel |
| 10/20/1988 | WO1988008069A2 Apparatus for use in drilling |
| 10/12/1988 | EP0286302A2 Top head drive assembly with axially movable quill |
| 10/05/1988 | EP0285386A2 Internal wrench for a top head drive assembly |
| 10/05/1988 | EP0285385A2 Top head drive assembly for earth drilling machine and components thereof |
| 09/27/1988 | US4773490 Use in subterranean mining |
| 08/09/1988 | US4762187 Internal wrench for a top head drive assembly |
| 07/27/1988 | CN87214412U Two-speed hydraulic rotating disk for petroleum well repairing |
| 07/26/1988 | US4759738 Floating cushion sub |
| 06/30/1988 | DE3642387A1 Device for setting drill stems in rotational motion and for axially moving drill stems |
| 06/28/1988 | US4753300 Hydraulic top drive for wells |
| 05/31/1988 | CA1237423A1 Rotary rock drilling chuck |
| 05/31/1988 | CA1237422A1 Method of and device for adjusting the feed movement of a drill rod for drilling a rock |
| 05/31/1988 | CA1237421A1 Rotary drive coupling |
| 04/12/1988 | US4736807 Apparatus for rotating and reciprocating well pipe |
| 03/09/1988 | CN87207346U Rotary drilling machine |
| 02/09/1988 | CA1232601A2 Drill pipe pull-up mechanism |
| 02/02/1988 | CA1232265A2 Drill pipe coupling tool |
| 01/19/1988 | US4719978 Earth drilling device |
| 01/05/1988 | CA1231089A1 Device in rock drilling machines |
| 12/08/1987 | US4711310 For a drilling machine |
| 12/08/1987 | US4711090 Method of and device for adjusting the feed movement of a drill rod for drilling a rock |
| 11/25/1987 | CN87103327A Arrangement for supporting of axial bearing of drilling machine |
| 11/03/1987 | US4703811 Drilling and/or lifting machine |
| 10/28/1987 | CN87103112A Countercycle drilling method with pump up and its apparatus |
| 10/27/1987 | US4702328 Roof drilling system |
| 10/22/1987 | DE3610792A1 Electrohydraulic control for a casing machine for cased bores in the ground |
| 10/08/1987 | DE3610852A1 Method and apparatus for casing boreholes and for withdrawing the casing |
| 09/30/1987 | CN86210200U Electric heater for protecting pneumatic devices of well drill from frost |
| 09/29/1987 | US4696352 Metal carbides, nitrides, oxides; coal, concrete, masonry, rocks; |
| 09/22/1987 | CA1227189A1 Top drive well drilling apparatus with improved wrench assembly |
| 09/10/1987 | DE3704985A1 Vehicle inserting pipe in ground - comprises wheeled loader with torsion bar between brackets and hinging stabilising frame |
| 09/08/1987 | US4691790 Method and apparatus for removing the inner conduit from a dual passage drill string |
| 09/08/1987 | US4691787 Earth auger |
| 08/12/1987 | EP0231414A1 Earth auger |
| 07/15/1987 | CN85202963U Model zsk 50 rock core drilling machine |
| 07/14/1987 | CA1224205A1 Pressurized medium actuated gripping device |
| 06/24/1987 | EP0225979A1 Earth drilling device |
| 06/23/1987 | CA1223247A1 Well drilling assembly |
| 04/15/1987 | CN86200086U Constant-pressuring device for drills of boring tools |
| 04/01/1987 | EP0215998A2 A pile driver, pile drawer and/or drilling machine |
| 03/31/1987 | CA1219855A1 Floating cushion sub |
| 02/17/1987 | US4643262 Pressurized medium actuated gripping device |
| 02/04/1987 | CN86105254A Sideway driving motion dirller |
| 01/27/1987 | US4638871 Earth drill rig |
| 01/20/1987 | US4637477 Device in rock drilling machines |
| 12/23/1986 | US4630688 Power spinner for rotating a kelly joint |
| 12/02/1986 | US4625815 Drilling equipment, especially for use in underground mining |
| 11/25/1986 | US4624327 Method for combined jet and mechanical drilling |
| 11/25/1986 | US4624324 Turning mechanism operating alternately in opposite directions to facilitate the driving in or extracting of piles |
| 11/04/1986 | CA1213444A1 Turning mechanism operating alternately in opposite directions to facilitate the driving in or extracting of piles |
| 10/21/1986 | US4618172 Dual-wall drill pipe |
| 10/01/1986 | EP0196284A1 Well drilling apparatus |
| 09/23/1986 | CA1211750A1 Drill rod opening device for sectional rod drilling equipment |
| 07/16/1986 | EP0187637A2 A rotary head |
| 07/02/1986 | CN85108190A Rotary head for drilling machine |
| 06/10/1986 | US4593773 Well drilling assembly |
| 06/10/1986 | US4593769 Rotary rock drilling chuck |
| 05/27/1986 | US4591005 Drill rod opening device for sectional-rod drilling equipment |
| 05/20/1986 | US4589503 Top drive drilling apparatus with improved wrench assembly |
| 05/13/1986 | CA1204428A1 Earth drilling apparatus |
| 04/29/1986 | US4585079 Method and a machine for handling drill pipes |
| 04/24/1986 | WO1986002403A1 Method and apparatus for combined jet and mechanical drilling |
| 04/15/1986 | US4582146 Earth drilling apparatus |
| 04/10/1986 | CN85108188A Drilling and /or lifting machine |
| 04/10/1986 | CN85108187A Pile driver, pile drawer and/or drilling machine |
| 03/11/1986 | US4575359 Rotary drive coupling |
| 03/11/1986 | US4574893 Compact power swivel |
| 03/05/1986 | EP0172960A1 Continuous feeding and torqueing device for a drill stem |
| 02/25/1986 | US4572036 Power tong and jaw apparatus |
| 02/18/1986 | US4571215 Vibration dampener apparatus |
| 02/18/1986 | US4570706 Device for handling rods for oil-well drilling |
| 01/28/1986 | CA1199944A1 Working platform for a drilling apparatus |
| 01/21/1986 | US4565394 Dual-wall drill pipe |
| 12/27/1985 | EP0165479A2 Drill pipe |
| 11/26/1985 | US4554984 Drill box support mechanism for mining bolter machines |
| 11/21/1985 | EP0162001A1 Top drive well drilling apparatus with improved wrench assembly |
| 11/21/1985 | EP0162000A1 Top drive well drilling apparatus with removable link adapter |