| Patents for E21B 1 - Percussion drilling (2,080) |
|---|
| 10/27/1993 | CN2144704Y Toothless drill borehole device for mineral deposit |
| 10/27/1993 | CN2144703Y Toothless drill punched hole device for mineral deposit |
| 10/20/1993 | CN2144175Y Controller of gearless drilling equipment for ore deposit |
| 10/13/1993 | EP0565500A1 Rock drilling device |
| 10/13/1993 | CN2143669Y Simple hole driller |
| 10/06/1993 | EP0439600B1 Drill |
| 09/15/1993 | CN2142140Y Underground percussion boring hole machine |
| 09/14/1993 | CA1322194C Combustion operated drilling apparatus |
| 09/01/1993 | EP0558097A1 Boring arm |
| 08/19/1993 | DE4143418A1 Pneumatic type hammer unit |
| 07/22/1993 | DE4227065A1 Hydropneumatic hammer drill for mining and road construction - has stepped diameter striking piston which divides cylinder into four chambers and permits short passages between valve and cylinder |
| 07/21/1993 | EP0551795A1 Tool for impact drilling and chiseling and chuck therefor |
| 07/15/1993 | DE4200574A1 Sleeve-valve-controlled pneumatic in-hole impact drill - has sleeve valve tripped by movement of striking piston to allow complete filling of both working chambers with compressed air. |
| 06/23/1993 | EP0548008A1 Tool for impact drilling and chiseling and tool chuck therefor |
| 05/18/1993 | US5211248 Portable soil sampling device and method |
| 04/29/1993 | DE4134956A1 Drucklufthammer Drucklufthammer |
| 04/24/1993 | WO1993008364A1 A pneumatic hammer |
| 04/24/1993 | WO1993008363A1 A pneumatic hammer |
| 04/24/1993 | CA2097068A1 Pneumatic hammer |
| 04/24/1993 | CA2097067A1 Pneumatic hammer |
| 03/30/1993 | CA1315272C Drilling apparatus |
| 03/16/1993 | US5193626 Drilling device |
| 02/02/1993 | US5183121 Submersible pneumatic drilling unit |
| 12/23/1992 | WO1992022727A1 Method and means for driving pipes into the ground and cartridge used therefor and for subsequent pipe blasting |
| 12/23/1992 | CA2111005A1 Method and means for driving pipes into the ground and cartridge used therefor and for subsequent pipe blasting |
| 12/22/1992 | US5172771 Reversible impact-operated boring tool |
| 12/01/1992 | US5167288 Rod driving tool |
| 10/28/1992 | EP0510416A2 Percussion mechanism for drill string |
| 09/30/1992 | EP0365612B1 Drill |
| 09/16/1992 | CN2116073U Electric impacting hammer |
| 09/08/1992 | CA1307298C Contamination reducing mining system for harmful ores |
| 09/03/1992 | WO1992014904A1 Drill head with integral impact hammers |
| 08/20/1992 | WO1992014026A1 Drop-hammer drive |
| 07/23/1992 | WO1992012323A1 Hydraulic down-the-hole drilling machine |
| 07/21/1992 | US5131476 Down hole percussion drill apparatus |
| 07/14/1992 | US5129466 Hydraulically operated striking mechanism |
| 06/02/1992 | US5117923 Hydraulic jackhammer |
| 06/02/1992 | US5117921 Hydraulically operated hammer drill |
| 06/02/1992 | US5117920 Pole driver |
| 05/13/1992 | EP0484839A2 Reversible impact-operated boring tool |
| 05/13/1992 | EP0484672A1 Submersible pneumatic drilling unit |
| 05/10/1992 | CA2054925A1 Submersible pneumatic drilling unit |
| 04/08/1992 | CN1016205B Drill |
| 03/24/1992 | CA1297868C Arrangement for mounting of a rotation element in a drilling machine |
| 03/24/1992 | CA1297866C Arrangement for the axial bearing of a drilling machine |
| 03/18/1992 | EP0475171A2 Hydraulically operated percussion mechanism |
| 03/11/1992 | EP0473968A2 Hydraulic operated impact drilling device, especially for bolt drilling |
| 03/04/1992 | EP0472982A2 Hydraulically operated impact drilling device, especially for boltdrilling |
| 03/03/1992 | US5092411 Drilling apparatus |
| 02/25/1992 | US5090487 Drill head with integral impact hammers |
| 02/20/1992 | DE4131070A1 Hydraulically-driven drill hammer - has control valve sliding coaxially in striker piston |
| 02/07/1992 | CA2048374A1 Hydraulic hammer |
| 01/15/1992 | EP0465864A1 Drill hammer control valve |
| 11/27/1991 | EP0458767A2 Steering mechanism for a subsoil boring apparatus |
| 11/27/1991 | CN1056555A Autocontroller for impact and rotation |
| 11/26/1991 | CA2036528A1 Steering mechanism for a subsoil boring apparatus |
| 11/05/1991 | USRE33733 Device for driving a drilling and/or impacting tool |
| 10/22/1991 | US5058686 Sliding-weight operated hole boring tool |
| 10/08/1991 | US5054565 Steering mechanism for a subsoil boring apparatus |
| 10/02/1991 | DE4010031A1 Motor driven force pulse generator - has reversing piston located inside enclosed oscillating cylinder and sandwiched between two gas cushioning chambers |
| 09/25/1991 | EP0447552A1 Striking device |
| 09/03/1991 | US5044398 Control valve for counterblow-tap hole-boring machine |
| 08/13/1991 | US5038668 Hydraulic striking mechanism |
| 08/07/1991 | EP0439600A1 Drill. |
| 07/30/1991 | CA1286980C2 Well perforating apparatus and method |
| 05/07/1991 | US5012762 Device for determining the index of individual productivity and feed ration of animals |
| 05/03/1991 | WO1991006744A1 Linear impact ripper apparatus |
| 05/03/1991 | CA2072648A1 Linear inpact ripper apparatus |
| 04/30/1991 | US5010963 Hydraulic drilling machine |
| 03/07/1991 | WO1991002880A1 Drill |
| 02/20/1991 | EP0413189A1 Control of the cable drum of a winch holding a free-falling ramming weight |
| 02/19/1991 | US4993500 Automatic drive hammer system and method for use thereof |
| 02/12/1991 | US4991664 Compression-vacuum percussive action machine |
| 01/24/1991 | WO1991000952A1 Striking device |
| 01/23/1991 | CN1011323B Tow piece downhole drill chuck |
| 01/15/1991 | US4984850 Linear impact ripper apparatus |
| 12/26/1990 | CN2068142U Punching grabbing drilling machine |
| 12/19/1990 | EP0402470A1 Instrument for percussion-rotary drilling |
| 12/18/1990 | US4977965 Automatic drop hammer system |
| 10/31/1990 | EP0394765A1 Hydraulic percussion mechanism |
| 10/25/1990 | DE3913426A1 Maschinenhammer Steam hammer |
| 10/24/1990 | EP0372089A4 Method and device for determining the quantity of milk extracted from one cow |
| 10/10/1990 | EP0382852A4 Device for determining the index of productivity and food ration of animals |
| 10/04/1990 | DE3910599A1 Drilling and/or percussion hammer |
| 10/04/1990 | DE3910598A1 Hammer with air spring percussion mechanism |
| 10/03/1990 | EP0389956A1 Automatic drive hammer apparatus |
| 10/03/1990 | CN1009847B Air pressure impact drilling method and apparatus for same |
| 08/23/1990 | DE3905106A1 Deep-hole hammer drill with water-flushing arrangement |
| 08/22/1990 | EP0382852A1 Device for determining the index of productivity and food ration of animals |
| 08/16/1990 | EP0381921A2 Control valve for a counter-blow tapping-hole drill |
| 07/18/1990 | EP0378045A1 Hydraulic drill hammer |
| 07/12/1990 | WO1990007626A1 Instrument for percussion-rotary drilling |
| 07/03/1990 | US4938297 Ram boring machine |
| 06/19/1990 | US4934465 Arrangement for the axial bearing of a drilling machine |
| 06/13/1990 | EP0372089A1 Method and device for determining the quantity of milk extracted from one cow |
| 05/02/1990 | EP0365612A1 Drill. |
| 04/25/1990 | CN1007745B Arrangement for mounting of rotation element in drilling machine |
| 02/27/1990 | CA1266208A1 Valveless pneumatic hammer |
| 02/22/1990 | WO1990001612A1 Compression-vacuum percussion machine |
| 02/22/1990 | DE3828309A1 Hammer drill |