| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 08/30/1994 | US5342129 Bearing assembly with sidewall-brazed PCD plugs |
| 08/23/1994 | US5339910 Drilling torsional friction reducer |
| 08/18/1994 | WO1994018427A1 Reversible casing for a down-the-hole percussive apparatus |
| 08/16/1994 | US5337840 Improved mud motor system incorporating fluid bearings |
| 08/16/1994 | US5337837 Dual-diameter pneumatic ground piercing tool |
| 08/10/1994 | EP0531446B1 Downhole fluid motor composite torque shaft |
| 08/10/1994 | CN1090631A Diamond bearing assembly |
| 08/03/1994 | EP0608316A1 Wing motor. |
| 07/21/1994 | WO1994016198A1 Downhole roller vane motor and roller vane pump |
| 07/21/1994 | WO1994016189A1 Improved mud motor system |
| 07/20/1994 | CN1025511C Hybrid pneumatic percussion rock drill |
| 07/13/1994 | EP0605562A1 Apparatus and method for removing drillhole debris. |
| 07/12/1994 | US5327980 Drill head |
| 07/12/1994 | US5327636 Reversible impact-operated boring tool |
| 07/05/1994 | US5325932 Stabilizer for a rock boring apparatus |
| 07/05/1994 | US5325926 Reversible casing for a down-the-hole percussive apparatus |
| 07/05/1994 | US5325714 Steerable motor system with integrated formation evaluation logging capacity |
| 06/28/1994 | US5323852 Torque limiter for auger gravel pack assembly |
| 06/23/1994 | WO1994013925A1 A device for drilling holes in the crust of the earth, especially for drilling oil wells |
| 06/22/1994 | CN1088283A Cement soil apparatus of underground borer |
| 06/21/1994 | US5322391 Guided mole |
| 06/21/1994 | US5322136 Air percussion drilling assembly |
| 06/15/1994 | EP0601687A1 Boring apparatus |
| 06/07/1994 | US5318140 Fluid operated drill apparatus |
| 06/07/1994 | US5318135 Soil displacement hammer with reversing mechanism |
| 06/07/1994 | US5318115 Casing cutting and retrieving tool |
| 06/07/1994 | CA1330076C Downhole drilling motor |
| 05/31/1994 | US5316094 Well orienting tool and/or thruster |
| 05/18/1994 | CN2165221Y Lightweight down-hole drill |
| 05/17/1994 | US5311954 Process for overcoming drag while installing an element within a cavity |
| 05/17/1994 | US5311950 Differential pneumopercussive reversible self-propelled soil penetrating machine |
| 05/17/1994 | CA2026630C Method of increasing the off bottom load capacity of a bearing assembly |
| 05/05/1994 | DE4236737A1 Drilling-rig for blasting holes - has hydraulically-operated reversing drive between boring bar and crown-shaped bit |
| 05/04/1994 | EP0595631A1 Diamond bearing assembly |
| 05/04/1994 | EP0595630A1 Diamond bearing assembly |
| 05/03/1994 | US5308150 Cutter head for a rock boring apparatus |
| 05/03/1994 | US5307886 Method for casing a hole drilled in a formation |
| 05/03/1994 | US5307883 Method and apparatus for controlling a ramming device |
| 04/29/1994 | CA2109339A1 Diamond bearing assembly |
| 04/29/1994 | CA2109335A1 Diamond bearing assembly |
| 04/26/1994 | US5305841 Hammer device |
| 04/26/1994 | US5305837 Air percussion drilling assembly for directional drilling applications |
| 04/13/1994 | CN2161714Y Down-hole drilling machine |
| 04/12/1994 | US5301761 Pressure reversing valve for a fluid-actuated, percussive drilling apparatus |
| 04/12/1994 | US5301759 Method and apparatus for core-sampling subsurface rock formations |
| 04/12/1994 | US5301758 Method and apparatus for enlarging a bore hole |
| 04/12/1994 | CA2023042C Sealed downhole motor drive shaft universal joint assembly |
| 04/06/1994 | EP0590335A1 Boring ram |
| 04/05/1994 | CA1328252C Hammer drills for making boreholes |
| 03/30/1994 | EP0441890B1 Directional drilling apparatus and method |
| 03/29/1994 | CA1328102C Down hole drill improvement |
| 03/24/1994 | DE4231025A1 Deep drilling tool drive assembly of tubular form - in which a residual core can grow within a core pipe which extends through the pipe |
| 03/17/1994 | WO1994005941A1 Guided mole |
| 03/17/1994 | WO1994005891A1 Drill string anchor |
| 03/17/1994 | CA2142123A1 Guided mole |
| 03/15/1994 | CA1327790C Rotor adapter |
| 03/15/1994 | CA1327789C Drilling system |
| 03/02/1994 | EP0584131A1 Soil displacement hammer with movable head. |
| 03/01/1994 | US5290145 Multiple stage drag and dynamic pump |
| 02/22/1994 | US5288271 Constant velocity universal joint assembly for downhole motor |
| 02/22/1994 | US5288173 Method for the directional control of an earth boring device as well as apparatus for making earth bores |
| 01/26/1994 | EP0580056A1 Air percussion drilling assembly for directional drillig applications |
| 01/19/1994 | EP0578942A1 Boring ram |
| 01/18/1994 | US5279371 Down-the-hole drilling machine |
| 01/12/1994 | EP0577664A1 A drilling equipment and a method for regulating its penetration |
| 01/11/1994 | US5277264 Hydropneumatic hammer |
| 01/11/1994 | US5277260 In a percussion drilling apparatus |
| 01/05/1994 | CN2152070Y Directional hinged short screw drilling rig |
| 12/23/1993 | CA2098787A1 Impact block assembly for percussion drilling apparatus |
| 12/19/1993 | CA2071612A1 Apparatus for preventing an uncontrolled increase in the speed of a drilling motor during air drilling |
| 12/16/1993 | DE4225806C1 Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier |
| 12/14/1993 | US5269383 Navigable downhole drilling system |
| 12/09/1993 | WO1993024728A1 Downhole tools |
| 12/07/1993 | US5267622 Impact block assembly for percussion drilling apparatus |
| 12/07/1993 | US5267398 Method for manufacturing a diamond thrust bearing |
| 12/01/1993 | EP0460202B1 Progressive cavity drilling apparatus with flow restrictor |
| 11/30/1993 | US5265682 Steerable rotary drilling systems |
| 11/25/1993 | WO1993023651A1 Improved drilling arrangement and method |
| 11/14/1993 | CA2068608A1 A downhole bearing assembly |
| 11/14/1993 | CA2068605A1 A downhole bearing assembly |
| 11/10/1993 | EP0568723A1 Multiple stage drag and dynamic turbine downhole motor |
| 11/09/1993 | CA2068398A1 Multiple stage drag and dynamic turbine downhole motor |
| 10/28/1993 | WO1993021418A1 Use of pressurized medium in drilling |
| 10/28/1993 | CA2132426A1 Use of pressurized medium in drilling |
| 10/20/1993 | EP0566144A1 Downhole motor having a flexible connecting rod |
| 10/19/1993 | US5253939 High performance bearing pad for thrust bearing |
| 10/19/1993 | US5253722 Impact borer for embedding lines, anchoring cables and sinking wells |
| 10/17/1993 | CA2094195A1 Downhole motor having a flexible connecting rod |
| 10/14/1993 | WO1993020325A1 Down reaming apparatus |
| 10/14/1993 | CA2131380A1 Down reaming apparatus |
| 10/13/1993 | CN1022431C Through type in the hole drill reversing circulation core bit |
| 10/06/1993 | EP0564427A1 Down-the-hole drilling machine |
| 10/06/1993 | EP0439600B1 Drill |
| 10/05/1993 | US5249634 Impact borer for embedding lines, anchoring cables, and sinking wells |
| 09/29/1993 | CN1076756A Reversible bit bearing |
| 09/28/1993 | US5248896 Power generation from a multi-lobed drilling motor |
| 09/28/1993 | US5248204 Short stack bearing assembly |
| 09/22/1993 | CN1022197C Composite installation for turning borer of over footage and rebounding with obsorption and vibration |
| 09/21/1993 | US5246079 High-efficiency earth boring system |
| 09/14/1993 | CA1322194C Combustion operated drilling apparatus |