| Patents for E21B 3 - Rotary drilling (4,061) |
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| 08/12/1998 | CN1190149A Method for horizontal directional drilling of rock formations |
| 08/05/1998 | CN2287203Y Two bearing transmission of drill spindle |
| 07/29/1998 | EP0855490A2 Drilling apparatus and downhole torque generator |
| 07/16/1998 | DE19700701A1 Rotary strata-bolting drilling machine with flushing tube and rod |
| 07/14/1998 | US5778988 Drilling apparatus |
| 07/14/1998 | US5778987 Guided drilling system with shock absorber |
| 07/14/1998 | CA2165467C Chuck assembly for a drill box of a mine drill |
| 05/26/1998 | US5755296 Portable top drive |
| 05/13/1998 | EP0841467A1 Rock milling head |
| 05/06/1998 | CN2280604Y Driving device of electric tool |
| 05/05/1998 | US5746277 Drilling apparatus |
| 05/05/1998 | US5746276 Method of rotating a tubular member |
| 04/29/1998 | CN2280154Y Main shaft sealing device of built-in type in drilling machine |
| 04/23/1998 | WO1998016716A1 Continuous circulation drilling method |
| 04/22/1998 | CN1179498A Drilling apparatus and drilling method for renovating underground pipes |
| 04/07/1998 | US5735351 Top entry apparatus and method for a drilling assembly |
| 02/24/1998 | CA2133677C Coupling for rotary-vibratory drills |
| 01/22/1998 | DE19645650C1 Rock face cutting head |
| 01/21/1998 | EP0819832A2 Drilling and pumping device and use of hydrodynamic retardersto compensate for reactive torque introduced by the driving system |
| 01/21/1998 | CN2272940Y Screw driller |
| 01/08/1998 | WO1998000624A1 Boring tool for reverse circulation |
| 01/07/1998 | CN1169765A A drilling method and bit assembly to realise method |
| 12/30/1997 | US5701963 Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas |
| 12/17/1997 | EP0812377A1 Hydraulic tubing machine as an attachment for a mobile rotary boring installation |
| 12/17/1997 | CN2270803Y Drilling filling friction pile hole drilling device |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/25/1997 | US5690183 Drill head unit |
| 11/19/1997 | CN2268122Y Dipper earth-boring machine |
| 11/05/1997 | EP0805257A2 Guided drilling system with shock absorber |
| 11/05/1997 | EP0804315A2 Machine-tool |
| 10/23/1997 | DE19615307A1 Hydraulic hammer action drill |
| 10/21/1997 | US5678801 Post hole digger stand |
| 10/15/1997 | EP0800609A1 A drilling method and bit assembly to realize the method |
| 10/07/1997 | CA2071874C Motorized swivel provided with a dynamometric measurement unit |
| 09/18/1997 | WO1997034070A1 Device for drilling a bore hole in the ground |
| 09/18/1997 | DE19609899A1 Vorrichtung zur Herstellung eines Erdlochs Apparatus for producing a earthen hole |
| 08/27/1997 | CN2260888Y Gas-liquid controller for disk-type braking |
| 08/20/1997 | CN2260166Y Drill lined hole mud circulation working equipment for shallow sea petroleum prodn. and storage platform |
| 06/11/1997 | EP0777810A1 Portable top drive |
| 06/04/1997 | CN2255499Y Practical omnibearing mini-sized drilling machine |
| 05/21/1997 | CN2254479Y Engineering drill |
| 05/15/1997 | DE19628950A1 Deep drilling machine |
| 05/14/1997 | EP0773380A1 Power driven head for boring rods |
| 05/07/1997 | DE19549160C1 Rotary impact drill mechanism |
| 04/23/1997 | CN2252876Y Drilling tool for piling on rock |
| 03/26/1997 | CN2250414Y Contact roller square-drive master bushing |
| 03/12/1997 | EP0760899A1 Top entry apparatus and method for a drilling assembly |
| 03/12/1997 | EP0760896A1 A well entry tool |
| 03/06/1997 | DE19621849A1 Borehole drilling device for rotating and for moving tube lengths axially |
| 01/22/1997 | CN2245658Y Quick shaft drill jumbo |
| 12/06/1996 | CA2150997A1 Blasthole drill with drill-through pipe rack |
| 12/04/1996 | CN2241769Y Drilling machine for water well |
| 11/28/1996 | DE19530802C1 Portable drilling rig with manual and automatic reversing switches |
| 11/06/1996 | CN2239497Y Winch platform climbing angle regulating device of petroleum drilling machine |
| 11/06/1996 | CN2239496Y Nizhifu-driller drilling machine |
| 11/05/1996 | US5570577 Anchor torque controller for anchor installing machines |
| 10/22/1996 | US5566769 Tubular rotation tool for snubbing operations |
| 10/10/1996 | DE19512109A1 Drilling rig mounted on tractor unit with compact drive head arrangement |
| 10/09/1996 | EP0736664A2 Rotary device unit for an earth drilling rig |
| 10/03/1996 | WO1996030624A1 Top entry apparatus and method for a drilling assembly |
| 09/25/1996 | EP0733151A1 Shaft bearing in a rock and ground-drilling machine |
| 09/25/1996 | CN2235986Y Multi-function vibration pile hammer |
| 09/19/1996 | WO1996028630A1 Hydraulic tubing machine as an attachment for a mobile rotary boring installation |
| 09/19/1996 | DE19509379A1 Hydraulische Verrohrungsmaschine als Anbaugerät für eine mobile Drehbohranlage Hydraulic piping machine as attachment for a mobile drilling rig |
| 08/27/1996 | US5550416 Control mechanism of revolving speed of an electric tool |
| 08/21/1996 | EP0727560A2 Casing rotating device for drilling machines |
| 08/21/1996 | CN1129414A Chuck assembly for a drill box of a mine drill |
| 08/14/1996 | EP0725865A1 Drilling apparatus |
| 08/06/1996 | US5542476 Apparatus for drilling and maintenance of holes in a golf course |
| 07/02/1996 | US5531278 Power drill with drill bit unit capable of providing intermittent axial impact |
| 06/20/1996 | WO1996018798A1 A drilling method and bit assembly to realize the method |
| 05/22/1996 | CN2227733Y Rotary drilling-tube pile hole bore |
| 05/21/1996 | US5517774 Earth boring rotary tool with axial feed |
| 05/08/1996 | CN1121979A Supercharged hydraulic drilling tool |
| 05/01/1996 | CN2226137Y Gas-controlled clutch device for water brake of petroleum driller |
| 05/01/1996 | CN1121555A Tool for transporting cutting means to and from a ground drill |
| 05/01/1996 | CN1121554A Insert for releasably retaining cutting means in a ground drill |
| 05/01/1996 | CN1121552A Drive sub |
| 04/03/1996 | CN2223774Y Multi-function self walking drilling machine |
| 03/26/1996 | US5501286 Method and apparatus for displacing a top drive torque track |
| 03/21/1996 | WO1996008631A1 Portable top drive |
| 03/20/1996 | CN1031366C Working method for buried underground utilities and equipment |
| 03/19/1996 | CA2118608C Portable top drive assembly |
| 03/07/1996 | WO1996006714A1 Stand for a stone-working machine, especially a core boring machine |
| 02/28/1996 | CN1117554A Numerical control electric driving device for drill rig |
| 02/20/1996 | US5492183 Drill head unit |
| 01/10/1996 | CN2217097Y Main machine and its auxiliary machine for well-drilling, and well-drilling machine working by the auxiliary machine |
| 01/03/1996 | CN2216585Y Double-driving two-purpose drilling machine |
| 12/27/1995 | EP0556371B1 Method and apparatus for calibration of angular displacement |
| 12/19/1995 | CA2007461C Whipstock starter mill with pressure drop tattletale |
| 12/12/1995 | CA2018826C Detachable torque transmitting tool joint |
| 12/07/1995 | WO1995033120A1 A well entry tool |
| 11/29/1995 | CN2213833Y Top-stage transmission device of petroleum drilling machine |
| 11/29/1995 | CN2213832Y Power device for drilling machine |
| 11/22/1995 | EP0682739A1 Top drive apparatus |
| 11/08/1995 | CN2212065Y Engineering drill main driving system refitted from tractor part |
| 10/18/1995 | CN1110365A Driving device for drilling rig |
| 09/21/1995 | WO1995017991A3 Machine-tool |
| 09/13/1995 | CN2207437Y Boring driller |
| 08/30/1995 | CN2206346Y Winch brake device for petroleum drilling rig |