| Patents for E21B 1 - Percussion drilling (2,080) |
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| 03/15/2000 | CN1247252A Percussion sport appts. |
| 03/08/2000 | EP0843774A4 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 03/01/2000 | CN1049947C Controlling system controlled by flow for hydraulic rock drill |
| 02/29/2000 | US6029757 Casing hammer assembly for cable tool drilling apparatus |
| 02/17/2000 | WO2000008303A1 Arrangement for controlling rock drilling |
| 02/17/2000 | CA2338760A1 Arrangement for controlling rock drilling |
| 02/16/2000 | CN1049471C 液压冲击装置 Hydraulic impact device |
| 02/09/2000 | CN2363039Y Drilling tool for mountain gravel |
| 02/01/2000 | CA2161129C Rock drill percussion mechanism |
| 01/26/2000 | CN2360580Y Improved plunger sliding valve pneumatic impacting mechanism |
| 12/29/1999 | CN2356137Y Drilling device for central hole enlarging sleeve follow-up down-the-hole hammer drill |
| 12/29/1999 | CN2356136Y Improved drill rig for drilling well in gravel area |
| 12/22/1999 | CN2355092Y Hydraulic impulsive pressurizer for drill |
| 12/21/1999 | US6003619 Back driving automatic hammer |
| 11/11/1999 | WO1999057409A2 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 |
| 11/03/1999 | CN2346923Y Multifunctional power gear mounted on impact drill |
| 10/28/1999 | WO1999054094A1 Hammer device |
| 10/13/1999 | CN1231379A Oil supply way for hydraulic support of hydraulic hammer drill and the structure for realizing said way |
| 10/06/1999 | EP0946338A1 Method for adjusting drilling of drilling machine and rock drill |
| 10/05/1999 | US5960893 Fluid-powered percussion tool |
| 09/29/1999 | CN2340888Y Assembled punch |
| 09/23/1999 | WO1999047313A1 Method and apparatus for controlling drilling of rock drill |
| 09/23/1999 | DE19812510A1 Hydro percussive jackhammer with pressure and return lines |
| 08/11/1999 | EP0934804A2 Fluid driven percussion device |
| 08/11/1999 | EP0759116A4 Reverse percussion device |
| 07/13/1999 | US5921327 Pneumatic impact tool having an integrally formed one-piece housing |
| 07/01/1999 | WO1999032266A1 Impact machine |
| 06/30/1999 | EP0785845B1 Valve arrangement in a hydraulic percussive rock drill |
| 05/12/1999 | CN2318005Y Hand held electric shock device |
| 05/12/1999 | CN1216334A Drilling machine |
| 04/27/1999 | US5896937 Buffer mechanism of hydraulic impact apparatus |
| 04/07/1999 | EP0906811A1 Drill hammer |
| 04/03/1999 | CA2248697A1 Rock drill |
| 03/17/1999 | CN2310856Y Rotary double rope elevating percussion bit |
| 01/21/1999 | DE19741347C1 Drillstring rotary drive with double-acting piston in hydraulic cushioning chambers |
| 01/20/1999 | CN1041697C Tooland tool receiver used for hand tool device |
| 01/19/1999 | US5860481 Fluid-operated striker assembly with automatic stroke length variation |
| 01/06/1999 | CN2303075Y Percussion drilling machine |
| 12/29/1998 | US5853052 Hydraulic drive for rotation of a rock drill |
| 12/16/1998 | EP0884446A2 Drilling apparatus |
| 11/26/1998 | DE19721383A1 Drilling tool blockage prevention system |
| 11/25/1998 | CN2298338Y Drilling for construction in clayed layer large tube shed |
| 11/11/1998 | CN1198794A Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 10/29/1998 | WO1998048141A1 Downhole apparatus |
| 10/28/1998 | CN2295845Y Drilling apparatus for horizotal anchorage cable bores |
| 10/07/1998 | EP0868263A1 A piston construction for an axial bearing of a drilling machine |
| 10/07/1998 | CN2293637Y Percussion drilling tool |
| 10/01/1998 | WO1998042481A1 Arrangement in rock drill and method of controlling rock drilling |
| 10/01/1998 | CA2285971A1 Arrangement in rock drill and method of controlling rock drilling |
| 09/23/1998 | CN2292158Y Drill line threading device for drill |
| 09/15/1998 | US5806610 Apparatus for generating impacts |
| 09/09/1998 | CN2290688Y 横向钻机 Lateral Drilling Rig |
| 09/08/1998 | US5803550 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 08/18/1998 | US5795991 Drilling apparatus |
| 08/18/1998 | US5794717 Rock drill percussion mechanism |
| 08/05/1998 | EP0856637A1 Shock-absorbing mechanism for hydraulic hammering device |
| 07/14/1998 | US5778987 Guided drilling system with shock absorber |
| 06/30/1998 | US5771982 Rock drill |
| 06/30/1998 | US5771981 Control system for percussion drill |
| 06/17/1998 | EP0847836A1 Percussive tool with fluid pressure drive |
| 06/16/1998 | US5765651 Bi-directional pipe driving apparatus |
| 06/10/1998 | EP0729555A4 Improved guided mole |
| 06/03/1998 | CN2282967Y Pneumatic percussive mechanism with locking valve |
| 05/27/1998 | EP0843774A1 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 05/19/1998 | US5752572 Tractor for remote movement and pressurization of a rock drill |
| 05/19/1998 | US5752571 Apparatus for generating impacts |
| 05/12/1998 | US5749677 Apparatus for impact action |
| 04/22/1998 | EP0837214A2 Percussive drill |
| 04/22/1998 | EP0836545A1 Pneumatic impact tool |
| 03/11/1998 | EP0827813A2 Hydraulically actuated mechanism with automatic stroke change |
| 02/10/1998 | CA2054488C Reversible impact-operated boring tool |
| 12/24/1997 | WO1997048882A1 Hydraulic percussion mechanism |
| 12/17/1997 | CN2270803Y Drilling filling friction pile hole drilling device |
| 12/11/1997 | DE19623016A1 Apparatus for trenchless laying of new underground communications and for reconstruction of existing communications |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/19/1997 | CN2268121Y Casing-pipe boring machine |
| 11/19/1997 | CN2268120Y Rotatable double-rope-elevating percussion drill |
| 11/05/1997 | EP0805257A2 Guided drilling system with shock absorber |
| 10/23/1997 | DE19615307A1 Hydraulic hammer action drill |
| 10/07/1997 | US5673761 For manual drilling of holes in ice |
| 09/16/1997 | CA1339457C Pile driving apparatus |
| 09/03/1997 | EP0587675B1 Method and means for driving pipes into the ground and cartridge used therefor and for subsequent pipe blasting |
| 08/27/1997 | CN2260888Y Gas-liquid controller for disk-type braking |
| 08/20/1997 | CN2260165Y Machine for drilling well |
| 08/13/1997 | CN2259486Y Portable sounding device |
| 08/13/1997 | CN2259480Y Vacuum mud absorption well drilling machine |
| 08/06/1997 | CN1156211A Hydraulic impact device for stepless independently regulating impact energy and impact frequency |
| 07/30/1997 | EP0785845A1 Valve arrangement in a hydraulic percussive rock drill |
| 07/01/1997 | US5642786 Securing and tensioning device for a towing cable connected to a percussion boring machine |
| 06/25/1997 | CN2256929Y Omnibearing forced driving driller |
| 06/11/1997 | EP0778110A2 Method for modifying the operation mode of a fluid driven percussion mechanism and percussion mechanism for carrying out the method |
| 06/03/1997 | US5634524 Reverse percussion device |
| 04/24/1997 | WO1997014870A1 Shock-absorbing mechanism for hydraulic hammering device |
| 04/17/1997 | WO1997013622A1 A piston construction for an axial bearing of a drilling machine |
| 04/17/1997 | WO1997013621A1 Method for adjusting drilling of drilling machine and rock drill |
| 04/17/1997 | CA2234390A1 A piston construction for an axial bearing of a drilling machine |
| 04/03/1997 | WO1997012121A1 Subsurface pneumatic hammer |
| 04/03/1997 | WO1997012120A1 Subsurface pneumatic hammer |
| 03/12/1997 | EP0694112B1 Rock drill |
| 03/12/1997 | CN1034235C Driving control device for hammer |