| Patents for E21C 37 - Other methods or devices for dislodging with or without loading (1,249) |
|---|
| 03/19/1991 | US5000516 Apparatus for rapidly generating pressure pulses for demolition of rock having reduced pressure head loss and component wear |
| 03/06/1991 | CN1011890B Static crushing agent |
| 02/13/1991 | EP0412433A1 Cartridge for expelling liquids under pressure |
| 02/12/1991 | US4991664 Compression-vacuum percussive action machine |
| 01/24/1991 | WO1991000952A1 Striking device |
| 01/16/1991 | EP0407467A1 Hammer-swinging mechanism. |
| 01/15/1991 | US4984850 Linear impact ripper apparatus |
| 01/15/1991 | US4984639 Demolition hammer |
| 01/02/1991 | EP0404944A1 Device for directed splitting of monolith objects |
| 12/19/1990 | CN1010866B Two-spout hydraulic pulsating giant |
| 11/28/1990 | CN1047362A Freeing mineral method by horizontally and vertically alternative control of blasting |
| 11/28/1990 | CN1010601B Hydraulic pulse generator |
| 11/28/1990 | CN1010600B Double-barrel pulse-generating hydraulic monitor |
| 11/22/1990 | EP0397858A1 Apparatus for forming slit in base rock and concrete surface |
| 11/06/1990 | US4968100 Expansion fracture device |
| 10/31/1990 | EP0394765A1 Hydraulic percussion mechanism |
| 10/30/1990 | US4965945 Excavating tooth |
| 10/30/1990 | CA1275660C Expansive demolition agent |
| 10/18/1990 | WO1990011871A1 Impact kerfing rock cutter and method |
| 10/17/1990 | EP0392030A1 Device for splitting monolithic objects |
| 10/03/1990 | CN2063167U Inserted chip of shot hole for quarrying |
| 09/26/1990 | CN2062761U Hydraulic top-splitting device |
| 09/26/1990 | CN1045551A 液压冲击工具 Hydraulic impact tools |
| 09/19/1990 | EP0388368A1 Method for accelarating the action of expansive mortars |
| 09/19/1990 | CN2062381U 液压劈裂器 Hydraulic fracturing is |
| 08/28/1990 | US4952243 Statical demolition-facilitating agent |
| 08/22/1990 | EP0382847A1 Power drive |
| 08/15/1990 | CN1009214B Hydraulic pulse generator |
| 08/07/1990 | US4945998 Hydraulic impact tool |
| 08/06/1990 | CA2009445A1 Expansion fracture device |
| 07/26/1990 | WO1990008247A1 Device for directed splitting of monolith objects |
| 07/11/1990 | EP0377052A1 Power element |
| 07/03/1990 | CA1271109A1 Power unit |
| 06/20/1990 | CN2058427U Pneumatic splitting stone machine |
| 06/13/1990 | EP0372531A2 An improved stonework crusher |
| 06/13/1990 | CN1042965A Apparatus for crushing entire object |
| 05/02/1990 | CN2056697U Water lifting device for explosive hole |
| 03/21/1990 | CN1040654A Device for building up directional force |
| 03/20/1990 | US4909152 Cartridge for the expulsion of liquids under pressure |
| 03/08/1990 | WO1990002245A1 Device for splitting monolithic objects |
| 03/06/1990 | US4906049 Ripper using a hydraulic hammer and a method for making the improvement |
| 02/28/1990 | CN1040074A Method for crushing kinds of rock utilizing explode |
| 02/22/1990 | WO1990001612A1 Compression-vacuum percussion machine |
| 02/13/1990 | US4900092 Barrel for rock breaking tool and method of use |
| 02/08/1990 | WO1990001116A1 Power drive |
| 01/31/1990 | EP0352742A2 Hydraulic impact tool |
| 01/24/1990 | CN2051670U Covered-barrel explosive and the loading tube thereof |
| 01/18/1990 | DE3823495A1 Hydraulische gesteinzerklueftende bohrlochsonde und verfahren zu ihrer anwendung Hydraulic gesteinzerklueftende borehole probe and method for their application |
| 01/17/1990 | EP0350676A1 Tool for forming groove in brittle object and method of fracturing same |
| 12/28/1989 | DE3902567C1 Machine for winning minerals or for driving underground roadways |
| 12/26/1989 | US4889192 Tractor-controlled hammer assembly |
| 11/30/1989 | WO1989011568A1 Hammer-swinging mechanism |
| 11/30/1989 | DE3913379A1 Method and arrangement for non-mechanical destruction of concrete/reinforced concrete and rocks |
| 11/16/1989 | WO1989011023A1 Power element |
| 11/15/1989 | CN2047718U Directly splitting machine for splitting ores |
| 10/03/1989 | US4871214 Cheeking device, particularly for the hanging roof in mines, underground working points, or heading and similar |
| 10/03/1989 | US4871212 Device for building up directional force |
| 09/26/1989 | US4869358 Conveyor belt system for a continuous mining machine |
| 09/13/1989 | CN2044284U High water pressur quarrying machine |
| 09/12/1989 | US4865391 Apparatus for building-up bursting forces |
| 09/05/1989 | USRE33042 Excavating tooth assembly |
| 09/05/1989 | US4863220 Highly reliable method of rapidly generating pressure pulses for demolition of rock |
| 08/23/1989 | CN2043272U Stone quarrying and shaping splitter |
| 08/23/1989 | CN1034975A Blasting wedge method |
| 08/22/1989 | US4858701 Fluid-powered impact device and tool therefor |
| 07/27/1989 | WO1989006741A1 Apparatus for forming slit in base rock and concrete surface |
| 07/27/1989 | WO1989006586A1 Fluid-powered impact device and tool therefor |
| 07/26/1989 | CN1034265A Method for controlling blasting operations |
| 07/26/1989 | CN1034243A Method for splitting of directionally |
| 07/19/1989 | CN2041359U Combined slot exploding method for sinking and driving and special implement therefor |
| 07/06/1989 | DE3743643A1 Method for directed separation of a monolithic object |
| 07/05/1989 | CN2040534U Groove cutting tool for grooving rock hole |
| 07/05/1989 | CN2040533U Steel wedge hole insertion piece |
| 06/13/1989 | US4838363 Rock-breaking apparatus |
| 05/16/1989 | US4829900 Mat for use with rock breaking tool |
| 05/03/1989 | CN2036994U Propelling and crushing machine |
| 04/26/1989 | EP0312831A1 Vibration isolator for a pneumatic chiselling hammer |
| 04/12/1989 | EP0311025A2 Device for shattering or splitting rocks or concrete by using a propellant charge and a liquid placed before said charge |
| 04/05/1989 | CN2035383U Hydraulic conical wedge expander |
| 04/04/1989 | US4818025 Narrow opening mechanical miner |
| 03/15/1989 | EP0306539A1 Device for the destruction of monolithic objects |
| 03/14/1989 | US4811505 Excavating tooth assembly |
| 03/08/1989 | EP0306414A1 Scaling device, in particular for hanging rock walls in mines, underground construction sites or the like |
| 03/08/1989 | EP0305553A1 Device for the destruction of monolithic objects |
| 03/08/1989 | EP0305552A1 Device for the destruction of monolithic objects |
| 02/28/1989 | US4807530 Expansive demolition agent |
| 02/15/1989 | EP0303198A1 Cartridge for expelling liquids by means of pressure |
| 01/17/1989 | US4798417 Method of separating the upper coal in seams |
| 01/04/1989 | CN2030257U Rock drill |
| 01/04/1989 | CN2030256U Expansively spalling machine |
| 01/04/1989 | CN2030215U Assembly digging teeth |
| 12/13/1988 | US4790602 Fluid actuated apparatus for mechanically splitting rock-like material |
| 11/01/1988 | US4781418 To break rock and concrete slabs |
| 10/18/1988 | US4778221 Movable device for openpit mining |
| 10/11/1988 | US4776436 Face shock absorber |
| 08/24/1988 | CN87100827A Two-spout hydraulic pulsating giant |
| 08/24/1988 | CN87100648A Hydraulic pulse generator |
| 08/10/1988 | CN86107048A Hydraulic elastic expanion breaker |
| 08/09/1988 | US4761900 Excavating tooth assembly |
| 07/28/1988 | WO1988005493A1 Device for creation of directed force |