| Patents for E21B 3 - Rotary drilling (4,061) |
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| 08/18/1995 | CA2464045A1 Torque control device for rotary mine drilling machine |
| 08/17/1995 | DE4412776C1 Supporting unit to grip and feed the drill string of a boring tool |
| 08/09/1995 | CN2204848Y Rotary table gear of oil drill |
| 08/09/1995 | CN2204847Y Multifunctional underwater drill |
| 08/01/1995 | US5437341 Multi-drill mounter |
| 08/01/1995 | US5437338 Hydraulic drive unit for driving a drilling tool |
| 07/18/1995 | US5433279 Portable top drive assembly |
| 07/06/1995 | WO1995017991A2 Machine-tool |
| 07/06/1995 | DE4402487A1 Drill for deep borehole |
| 07/05/1995 | CN2202792Y Double-energy integral pump counter-circulation submerged drill |
| 06/28/1995 | CN2202180Y Multi-functional hydraulic-driven power unit |
| 06/15/1995 | WO1995016101A1 Shaft bearing in a rock and ground-drilling machine |
| 06/15/1995 | CA2178596A1 Shaft bearing in a rock and ground-drilling machine |
| 05/30/1995 | CA1335732C Drilling rig |
| 05/09/1995 | US5413415 Rotary table deck bushing |
| 05/04/1995 | WO1995012040A1 Drilling apparatus |
| 05/04/1995 | CA2175361A1 Drilling apparatus |
| 04/25/1995 | US5409070 Coupling for rotary-vibratory drills |
| 04/19/1995 | EP0506919B1 Motorized swivel provided with a dynamometric measurement unit |
| 04/04/1995 | CA1335098C Manifold arrangement for use with a top drive power unit |
| 03/22/1995 | CN2192714Y Long Service life screw arbor drilling tool |
| 03/22/1995 | CN2192713Y High-power screw arbor drilling tool |
| 03/22/1995 | CN1027987C Rotary hole-boring machine |
| 03/15/1995 | CN2191920Y Driving device for drill |
| 03/15/1995 | CN2191919Y Driving device for light drill |
| 03/15/1995 | CN1100178A Method for enhancing limit anticollision reliability of driller |
| 03/14/1995 | US5396964 Apparatus and method for processing soil in a subterranean earth situs |
| 03/14/1995 | US5396952 Drilling rig kelly spinner |
| 03/02/1995 | WO1995005912A1 Chuck assembly for a drill box of a mine drill |
| 02/14/1995 | US5388651 Top drive unit torque break-out system |
| 02/01/1995 | CN2188644Y Rotary table for drilling machine |
| 01/19/1995 | DE4323708A1 Hydraulic motor with two switching stages and automatic control by way of the pressure supply |
| 01/17/1995 | US5381867 In a drilling rig system |
| 12/06/1994 | US5370194 Drive head assembly for drilling machine |
| 11/30/1994 | CN2184079Y Top electric drivor with guide single rail and lateral clamp check |
| 11/29/1994 | US5368083 Telescopic kelly bar apparatus and method |
| 10/27/1994 | WO1994024402A1 Drive head assembly for drilling machine |
| 10/25/1994 | US5358062 Portable handheld drilling apparatus |
| 09/07/1994 | CN1091807A Drilling machine |
| 08/30/1994 | US5341702 Apparatus for calibration of an angular displacement |
| 08/10/1994 | CN2173858Y Driller |
| 08/03/1994 | CN2173308Y Integral sealing low vehicle position winch mould block type drilling machine |
| 07/27/1994 | CN1090010A Auto-tapping two-way cutting force moment self-equilibrating excavation drill and method thereof |
| 07/19/1994 | US5330014 Power winch-ice auger conversion apparatus |
| 07/19/1994 | US5330013 For transmitting rotational power |
| 07/14/1994 | CA2087198A1 Hydraulic rod pusher-puller apparatus |
| 07/05/1994 | US5325931 Chuck assembly for a drill box of a mine drill |
| 06/15/1994 | EP0601916A1 Hydraulic motor mit for driving a drilling tool |
| 05/11/1994 | CN2164459Y Friction clutch shaft changing drill winch |
| 05/10/1994 | US5310287 Method and device for driving a pile or the like into and out of the ground |
| 05/04/1994 | EP0595439A2 Drill pipe breakout device |
| 05/04/1994 | CN2163860Y 螺杆钻具 Screw drill |
| 04/30/1994 | CA2104924A1 Drill pipe breakout device |
| 03/23/1994 | CN2159449Y Reverse-proof mechanism of rotary table |
| 03/02/1994 | CN2157978Y Adjustable angle shell unit specially for screw arbor drilling tool |
| 02/23/1994 | CN2157297Y Wire line running-out device for driller |
| 02/22/1994 | CA1327195C Top head drive assembly for earth drilling machine and components thereof |
| 02/03/1994 | DE4323126A1 Hand operated mechanical auger - has release lever associated with brake to disengage drive when auger strikes object |
| 01/04/1994 | US5275246 Drill string bridge coupler and actuator |
| 12/28/1993 | US5273124 Earth drilling apparatus |
| 12/28/1993 | US5272925 For driving drill pipe in rotation |
| 12/14/1993 | US5269107 Mobile boring rig |
| 12/09/1993 | WO1993024708A1 Apparatus for drilling and maintenance of holes in a golf course |
| 12/07/1993 | US5267621 Drill pipe breakout device |
| 12/01/1993 | CN2148167Y Leakproof drive head for drilling machine |
| 12/01/1993 | CN2148166Y Jaw Cardan shaft specially adapted for screw drilling tool |
| 11/30/1993 | US5265683 Floor drive drilling system |
| 11/25/1993 | WO1993023654A1 Top drive apparatus |
| 11/25/1993 | CA2135404A1 Top drive apparatus |
| 11/10/1993 | CN1078288A Fully electrically controlled well top driving mechanism |
| 10/26/1993 | US5255590 Control device for the load- dependent connection of a hydraulic stand by motor to a base-load motor |
| 10/12/1993 | US5251709 Drilling rig |
| 10/07/1993 | DE4210872A1 Drilling rig with windlass drive - for increased vertical travel of drill table on mast |
| 10/06/1993 | EP0439600B1 Drill |
| 09/21/1993 | US5246079 High-efficiency earth boring system |
| 09/14/1993 | US5244049 Rock drilling device |
| 08/25/1993 | EP0556371A1 Method and apparatus for calibration of an angular interferometer. |
| 08/11/1993 | EP0554241A1 Device for orienting rotor blades in a transverse fluid flow and applications |
| 07/31/1993 | CA2059215A1 Hydraulic rod pusher-puller apparatus |
| 07/21/1993 | EP0551487A1 System for in-situ treatment of underwater contaminated material |
| 07/21/1993 | EP0198060B1 Method and apparatus for combined jet and mechanical drilling |
| 07/01/1993 | DE4202554C1 Drill rig with vertical guide rod and feed table - has drive with cable whose ends are secured to top and lower guide rod sections respectively |
| 06/01/1993 | US5215153 Apparatus for use in driving or withdrawing such earth entering elements as drills and casings |
| 05/26/1993 | EP0543140A2 Drilling device for civil engineering and method for making stabilizing columns or similar structures in the ground |
| 05/18/1993 | US5211251 Apparatus and method for moving track guided equipment to and from a track |
| 03/31/1993 | EP0534919A1 Rock drilling device |
| 03/30/1993 | CA1315272C Drilling apparatus |
| 03/23/1993 | US5195598 Drill head assembly |
| 03/18/1993 | WO1993005360A1 Method and apparatus for calibration of an angular interferometer |
| 03/16/1993 | US5193626 Drilling device |
| 02/03/1993 | EP0525247A1 Apparatus for gripping a down hole tubular for rotation |
| 02/02/1993 | US5183121 Submersible pneumatic drilling unit |
| 01/26/1993 | WO1993001899A1 System for in-situ treatment of underwater contaminated material |
| 01/26/1993 | CA2092415A1 System for in-situ treatment of underwater contaminated material |
| 01/19/1993 | CA1312853C Hydraulic kelly bar chuck |
| 01/07/1993 | EP0521542A1 Method and device for driving a pile or the like into and out of the ground |
| 12/22/1992 | US5172776 Diamond drill chuck jaw carrier and assembly |
| 12/15/1992 | US5170850 Ratchet operated device for setting a post having an auger attached at one end |
| 12/10/1992 | DE4113847C1 Coupling releasably joining top end of string section with rotary drive pipe hole - uses coupling lever on axis at right angles to radial plane running through lever and rotation axis of drive pipe |
| 11/24/1992 | CA1310628C Top drive torque reactor |