| Patents for E21B 1 - Percussion drilling (2,080) |
|---|
| 01/31/1990 | EP0352979A2 Variable amplitude drill |
| 12/05/1989 | US4884642 Percussive action machine |
| 11/28/1989 | US4883133 Combustion operated drilling apparatus |
| 11/16/1989 | WO1989011022A1 Hydraulic drilling machine |
| 11/16/1989 | WO1989010688A1 Method and device for determining the quantity of milk extracted from one cow |
| 11/16/1989 | WO1989010687A1 Device for determining the index of productivity and food ration of animals |
| 11/01/1989 | CN1036811A Drill |
| 10/05/1989 | DE3809646A1 Free-fall control arrangement |
| 10/03/1989 | US4871035 Damping device for a percussion rock drilling machine |
| 10/03/1989 | US4871033 Motor-driven hand tool with braking torque device |
| 09/26/1989 | CA1260922A1 Air pressure impact drilling method and apparatus for same |
| 09/26/1989 | CA1260454A1 Annular air-hammer apparatus for drilling holes |
| 09/21/1989 | WO1989008769A1 Drill |
| 09/19/1989 | US4867250 Pneumatic impact imparting tool |
| 09/12/1989 | CA1259232A1 Percussive tool |
| 08/22/1989 | US4858701 Fluid-powered impact device and tool therefor |
| 08/10/1989 | WO1989007192A1 Device for making wells in the ground |
| 08/09/1989 | EP0326783A2 Motor-driven hand tool |
| 07/27/1989 | WO1989006586A1 Fluid-powered impact device and tool therefor |
| 07/06/1989 | DE3743333A1 Motor-driven chiselling or drilling hammer |
| 06/28/1989 | CN2040137U Multi-aperture punching and grabbing machine for making cone head |
| 06/27/1989 | US4842080 Arrangement for mounting of a rotation element in a drilling machine |
| 06/06/1989 | CA1255289A1 Device for making holes in soil |
| 05/11/1989 | DE3736413A1 Hand-held electric tool with drive spindle driven via a two- or multi-step reduction gearing |
| 04/11/1989 | US4819542 For creating impact pulses |
| 04/04/1989 | US4817736 Pheumatic impact imparting tool |
| 03/08/1989 | CN2033849U Pneumatic driven vole machine |
| 02/16/1989 | DE3726014A1 High-pressure deep-hole hammer drill, for example for injection holes |
| 02/01/1989 | EP0301287A2 Boring ram |
| 01/31/1989 | US4800965 Damping element, and its installation in a motor-driven hand tool |
| 12/13/1988 | US4790392 Soil sample core extraction tool |
| 12/13/1988 | US4790391 Air pressure impact drilling method and apparatus for same |
| 11/15/1988 | US4784228 Impact device |
| 10/11/1988 | US4776407 Clamping attachment to a device for driving rod elements of low rigidity into the ground |
| 10/04/1988 | US4775015 Sliding-weight operated hole boring tool |
| 08/30/1988 | US4766963 Hand-held hammer tool |
| 08/16/1988 | CA1240526A1 Clamping attachment to a device for driving rod elements of low rigidity into the ground |
| 07/14/1988 | WO1988005115A1 Percussion device |
| 07/14/1988 | DE3700175A1 Adapter for hammer drilling machines |
| 07/12/1988 | CA1239141A1 Coupling arrangement for a drill shank of a percussion drilling machine |
| 06/28/1988 | US4753302 Valveless pneumatic hammer |
| 06/07/1988 | US4749049 Hand-guided impact hammer and hammer drill |
| 04/27/1988 | EP0265401A2 Damping device for a percussion rock drilling machine |
| 04/21/1988 | DE3634923A1 Pneumatic piercing hammer |
| 04/13/1988 | CN85104730B Synthetic drilling and demolition well driving machine |
| 04/12/1988 | US4736806 Continuously revolving percussion drilling machine |
| 04/12/1988 | CA1235074A1 Soundproofing device for boring bar |
| 04/12/1988 | CA1235003A1 Device for driving a drilling and/or impacting tool |
| 02/23/1988 | US4726430 Device for driving a drilling and/or impacting tool |
| 02/23/1988 | CA1233164A1 Joint device in extension drill equipment for percussive drilling |
| 02/10/1988 | CN87104840A Two piece downhole drill chuck |
| 11/25/1987 | CN87103381A Arrangement for mounting of rotation element in drilling machine |
| 11/17/1987 | US4706764 Two piece down hole drill chuck |
| 11/10/1987 | US4705119 Annular air-hammer apparatus for drilling holes |
| 11/10/1987 | CA1229081A1 Method for optimizing rock drilling |
| 11/03/1987 | US4703941 Hammer drill chuck assembly |
| 10/27/1987 | US4702326 Coupling arrangement for a drill shank of a percussion drilling machine |
| 10/13/1987 | US4699223 Method and device for percussion earth drilling |
| 09/30/1987 | CN86210200U Electric heater for protecting pneumatic devices of well drill from frost |
| 09/22/1987 | CA1227093A1 Continuously revolving percussion drilling machine |
| 09/01/1987 | US4690226 Hammer drill |
| 09/01/1987 | US4690225 Percussive tool |
| 08/05/1987 | EP0230417A1 A rock drill |
| 07/28/1987 | CA1224682A1 Downhole drilling hammer |
| 07/02/1987 | WO1987003925A1 Percussion device |
| 06/09/1987 | US4671366 Method for optimizing rock drilling |
| 05/26/1987 | US4667749 Damping element, and its installation in a motor-driven hand tool |
| 04/28/1987 | US4660658 Hydraulic down-the-hole rock drill |
| 04/21/1987 | CA1220797A2 Oil recovery mining method and apparatus |
| 04/21/1987 | CA1220796A2 Oil recovery mining method and apparatus |
| 04/21/1987 | CA1220795A1 Oil recovery mining method and apparatus |
| 04/01/1987 | CN86106885A Air pressure impact drilling method and apparatus for same |
| 03/10/1987 | US4648467 Pressure fluid operated percussion drilling machine provided with a rotation mechanism |
| 03/03/1987 | US4646854 Hydraulic striking device |
| 02/24/1987 | US4645016 Resonant pile driving system |
| 01/13/1987 | US4635531 Hydraulically operated impacting device |
| 01/07/1987 | CN86203881U Man-power operated well-digging machine |
| 12/03/1986 | EP0203282A1 Control of a hydraulic percussive drilling device |
| 12/03/1986 | CN85104307A Optimal method for drilling rocks |
| 11/25/1986 | US4624339 Sound-proofing casing for a pneumatic percussive drill |
| 10/28/1986 | US4619334 Joint device in extension drill equipment for percussive drilling |
| 10/22/1986 | EP0094403B1 Rock breaking apparatus |
| 10/08/1986 | CN85105381A All-slope ice tunnel drilling machine |
| 09/24/1986 | EP0195193A1 Chuck for percussive-rotary or rotary drilling |
| 08/20/1986 | EP0191336A1 Assembly of an impact tool and a support unit |
| 06/19/1986 | WO1986003534A1 Clamping arrangement to device for driving into the ground rod elements of low rigidity |
| 06/17/1986 | US4594885 Projectile-propelling apparatus |
| 06/10/1986 | US4593768 Hydraulically operated impact device |
| 06/04/1986 | EP0183093A1 Hydraulic percussion device |
| 05/27/1986 | US4591009 Drill soundproofing device |
| 05/10/1986 | CN85104730A Synthetic drilling and demolition well driving machine |
| 05/09/1986 | WO1986002694A1 A rock drill |
| 04/22/1986 | US4583601 Hammer drill |
| 04/15/1986 | US4582145 Pressure-medium driven percussion device |
| 04/08/1986 | US4580640 Stroke control responsive to impact of hydraulic hammer |
| 03/25/1986 | CA1202203A1 Hand-held hammer tool |
| 03/18/1986 | US4576240 Hydraulic impact device |
| 03/12/1986 | EP0173922A1 Joint device in extension drill equipment for percussive drilling |
| 02/12/1986 | EP0171374A1 Hydraulic down-the-hole rock drill |
| 02/04/1986 | US4567951 Hammer drill |