| Patents for E21B 1 - Percussion drilling (2,080) |
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| 07/31/2002 | CN1361345A Power-saving low-noise pneumatic rock drill |
| 07/25/2002 | DE10101708A1 Verfahren zum Felsmeißeln A method for rock chisels |
| 07/18/2002 | WO2002055830A2 Method for rock-chiseling |
| 07/17/2002 | CN1358925A Oil back flow storage cavity for hydraulic impactor |
| 06/20/2002 | US20020074165 Drilling process monitor |
| 06/13/2002 | WO2002046564A2 Boring apparatus |
| 06/13/2002 | US20020070049 Drilling system |
| 06/13/2002 | US20020070013 Method and apparatus for forcing an object through the sidewall of a borehole |
| 06/12/2002 | EP1213441A1 Drilling system |
| 06/06/2002 | WO2002044511A1 Pneumatic rock-boring device and method for starting such a device |
| 06/06/2002 | WO2002044508A2 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 06/05/2002 | EP1064123B1 Method and apparatus for controlling drilling of rock drill |
| 05/15/2002 | CN2491193Y Driving gear of generating impact output |
| 05/10/2002 | WO2002036926A1 Rock drilling machine |
| 05/02/2002 | WO2002035062A1 Method of rock drilling |
| 05/01/2002 | CN1346929A Monitor system for drilling procedure |
| 04/16/2002 | US6371222 Hammer device |
| 03/14/2002 | US20020029908 Electrically sequenced tractor |
| 03/06/2002 | CN2480534Y Jetting suction type shot bit for oil-gas well |
| 02/27/2002 | CN2479178Y Hydraulic pereussion device |
| 02/21/2002 | WO2001040613A3 Reciprocating rotary drilling motor |
| 02/20/2002 | CN1336269A Rock drill and its hole forming method in cutting stone |
| 02/19/2002 | US6347674 Electrically sequenced tractor |
| 02/07/2002 | US20020014342 Impact hammer systems and methods |
| 01/16/2002 | CN2471919Y 冲击钻 Impact Drill |
| 01/09/2002 | CN1077666C Guided drilling system with shock absorber |
| 01/03/2002 | WO2002001041A1 Method of opening joints between drilling components, and rock drill |
| 12/19/2001 | CN1327119A Buffer pressure control equipment for hydraulic rock drill |
| 12/12/2001 | CN2464920Y Pneumatic valve free impacter |
| 12/12/2001 | CN1326035A Impact hammer system and method |
| 12/06/2001 | US20010047873 Damper pressure control apparatus for hydraulic rock drill |
| 12/05/2001 | EP1160416A2 Damper pressure control apparatus for hydraulic rock drill |
| 11/29/2001 | DE10024505A1 Verfahren zur Durchführung von Erd- oder Gesteinsarbeiten und hydraulisches Schlagwerk Method for performing ground or rock work and hydraulic percussion |
| 11/28/2001 | EP1157787A1 Method for soil and stoneworking and hydraulic impact tool |
| 11/28/2001 | CN2462063Y Hand-held electrical, pneumatic rock drill |
| 11/20/2001 | US6318478 Damper pressure control apparatus for hydraulic rock drill |
| 11/14/2001 | CN1074810C Hydrodynamic down-the-hole hammer capable of delivering high impact force |
| 11/13/2001 | US6315063 Reciprocating rotary drilling motor |
| 11/08/2001 | WO2001083931A1 Down hole hammer having a top sub |
| 11/08/2001 | WO2001083170A1 Method and arrangement for adjusting the percussion energy in a percussion drilling apparatus |
| 11/07/2001 | EP0836545B1 Pneumatic impact tool |
| 10/23/2001 | US6305480 Post driving and earth boring machine |
| 10/23/2001 | CA2178527C Boring ram |
| 10/10/2001 | CN2453103Y Mountain area drilling machine |
| 10/03/2001 | CN1072302C Digging method and system for controlled fragmentation and removing of material |
| 09/18/2001 | CA2214741C Tractor for remote movement and pressurization of a rock drill |
| 08/21/2001 | US6276453 Method and apparatus for forcing an object through the sidewall of a borehole |
| 08/16/2001 | WO2001059247A1 Percussive down-the-hole rock drilling hammer and piston therefor |
| 08/14/2001 | US6273199 Arrangement in rock drill and method of controlling rock drilling |
| 06/20/2001 | CN2435509Y Gas-liquid linkage rack drill |
| 06/07/2001 | WO2001040613A2 Reciprocating rotary drilling motor |
| 05/30/2001 | EP1102917A1 Arrangement for controlling rock drilling |
| 05/30/2001 | CN1296869A Drilling and punching machine |
| 05/23/2001 | EP1101570A2 Drilling- and percussion device |
| 05/23/2001 | DE19955412A1 Bohr- und Meisselgerät Drilling and chiseling |
| 05/16/2001 | CN2430534Y Butt-joint impact piston |
| 05/16/2001 | CN2430533Y Flexible hydraulic leg for rock drill |
| 05/16/2001 | CN2430532Y Self rise and fall double stage variable amplitude mechanism |
| 05/16/2001 | CN1065942C 冲击锤 Hammer |
| 05/03/2001 | DE19615307C2 Hydraulischer Bohrhammer A drill |
| 04/24/2001 | CA2202521C Valve arrangement in a hydraulic percussive rock drill |
| 04/11/2001 | EP1089854A1 Hammer device |
| 04/11/2001 | CN1290803A Back screw lifting device for hand-held electric or pneumatic rock drill |
| 03/27/2001 | CA2160995C Rock drill |
| 02/22/2001 | DE19939000A1 Hydraulic hammer drill has a deflection unit with a twisting flow channel at the hydraulic pressure inflow or the return line to reduce pressure swings and/or pressure bursts |
| 02/21/2001 | EP1076758A2 A method for the formation of a plug in a petroleum well |
| 02/13/2001 | US6186246 Method for adjusting drilling of drilling machine and rock drill |
| 02/07/2001 | CN2418244Y Afg.of double-drum synchronous capstan engine of impaction back-circulation driller by using rehicle to drive main driver |
| 02/07/2001 | CN2418243Y Distance-changeable self-falling automatic continuous impactiou driller |
| 02/07/2001 | CN2418242Y Impacting-type pile-hole driller |
| 01/24/2001 | EP1070569A1 Impact machine |
| 01/03/2001 | EP1064123A1 Method and apparatus for controlling drilling of rock drill |
| 01/03/2001 | CN2413010Y Die cutting head of percussion drilling machine |
| 11/29/2000 | EP1055489A2 Process for determing the operational life and state of a hydraulic impact assembly |
| 11/23/2000 | DE19923680A1 Verfahren zur Ermittlung der Betriebsdauer und des Einsatz-Zustands eines hydraulischen Schlagaggregats, insbesondere Hydraulikhammer, sowie Vorrichtung zur Durchführung des Verfahrens Method for determining the operating time and the use of state of a hydraulic percussion device, in particular hydraulic hammer, and device for carrying out the method |
| 11/22/2000 | CN2407119Y Drill |
| 11/21/2000 | US6148929 Feeler rod for water mains |
| 11/15/2000 | CN2406052Y Valve-less internal-revolving type pneumatic rock-drilling machine |
| 11/15/2000 | CN2406051Y Grooving machine for wall-making |
| 11/14/2000 | US6145933 Method for removing hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 11/01/2000 | CN2403885Y Perforator far guard rail steel pipe pile of super highway |
| 10/31/2000 | US6138775 Boring machine |
| 10/19/2000 | WO2000061335A1 Post driving and earth boring machine |
| 10/17/2000 | US6131672 Percussive down-the-hole rock drilling hammer and piston therefor |
| 10/17/2000 | CA2272773C Method of drilling boreholes in areas with restricted access |
| 09/20/2000 | CN2397249Y Universal fastening device for pneumatic rock drill |
| 09/19/2000 | US6119793 Rock drill |
| 09/05/2000 | US6112832 Method and apparatus for controlling a rock drill on the basis of sensed pressure pulses |
| 08/16/2000 | CN1263201A Hydrodynamic down-the-hole hammer capable of delivering high impact force |
| 07/20/2000 | WO2000042288A1 Method and apparatus for forcing an object through the sidewall of a borehole |
| 06/28/2000 | CN2385068Y Deep well drilling fluid dynamic jet impacter |
| 06/21/2000 | CN2383958Y 液压冲击器 Hydraulic impactor |
| 06/18/2000 | CA2686627A1 Electrically sequenced tractor |
| 04/27/2000 | DE19847687A1 Hammer drill or hammer tool with an air spring has a connecting opening to link the air spring zone with the ambient atmosphere on idle running for a smooth change between working and idle running modes |
| 04/20/2000 | DE19935890A1 Hit kinematic device for e.g. valve plug, valve tappet |
| 04/19/2000 | CN1051598C Automatic controller for impacting and rotating work |
| 04/12/2000 | CN2373550Y Hydraulic rockbolt drilling machine |
| 04/06/2000 | WO1999057409A3 A method and a plug for plugging a casing in a petroleum well and a tool for milling an opening in a casing in a petroleum well |
| 03/15/2000 | EP0733153B1 A hydraulic impact motor |
| 03/15/2000 | CN2368970Y Electric drive controller for drilling rig |