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Class Information
Number: 299/21
Name: Mining or in situ disintegration of hard material > Expansible breaking-down devices > Fluid-pressed element
Description: Apparatus in which one element of the device is expanded relative to another by the application of fluid pressure to the elements.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7185954 |
Method and device for removing part of concrete structure |
Mar. 6, 2007 |
| 6375271 |
Controlled foam injection method and means for fragmentation of hard compact rock and concrete |
Apr. 23, 2002 |
| 6305753 |
Hydraulic expansion tube |
Oct. 23, 2001 |
| 6305752 |
Pneumatic blasting device |
Oct. 23, 2001 |
| 6145934 |
Discharge destroying method, discharge destroying device and method of manufacturing the same |
Nov. 14, 2000 |
| 6102484 |
Controlled foam injection method and means for fragmentation of hard compact rock and concrete |
Aug. 15, 2000 |
| 5676427 |
Apparatus for hydraulically splitting up rock |
Oct. 14, 1997 |
| 5398998 |
Pressure actuated fracture device |
Mar. 21, 1995 |
| 5372195 |
Method for directional hydraulic fracturing |
Dec. 13, 1994 |
| 5020859 |
Apparatus for disintegrating monolythic entities |
Jun. 4, 1991 |
| 5000517 |
Powered member for splitting rock and other bodies |
Mar. 19, 1991 |
| 4968100 |
Expansion fracture device |
Nov. 6, 1990 |
| 4871212 |
Device for building up directional force |
Oct. 3, 1989 |
| 4790602 |
Fluid actuated apparatus for mechanically splitting rock-like material |
Dec. 13, 1988 |
| 4721339 |
Rock crushing device and a method thereof |
Jan. 26, 1988 |
| 4711501 |
Rock crushing device |
Dec. 8, 1987 |
| 4690460 |
Power unit |
Sep. 1, 1987 |
| 4657306 |
Hydraulic rock breaking tool |
Apr. 14, 1987 |
| 4449754 |
Device for breaking monolithic structures by pulsewise liquid pressure |
May. 22, 1984 |
| 4301731 |
Air shooting system for the mining of coal or the like |
Nov. 24, 1981 |
| 4048985 |
Exercise device |
Sep. 20, 1977 |
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