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Class Information
Number: 299/22
Name: Mining or in situ disintegration of hard material > Expansible breaking-down devices > Fluid-pressed element > Piston
Description: Apparatus in which one fluid pressed element comprises a piston.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 8100479 |
Miner acoustic communication and location system |
Jan. 24, 2012 |
| 6948573 |
Rock breaker tool |
Sep. 27, 2005 |
| 6213212 |
Spherical stemming plug and method of use |
Apr. 10, 2001 |
| 5015039 |
Hydraulically actuated mechanical rock excavator |
May. 14, 1991 |
| 4571002 |
Hydraulic rock splitter |
Feb. 18, 1986 |
| 4566736 |
Apparatus for mechanically breaking up rock |
Jan. 28, 1986 |
| 4474410 |
Power-driven, wedge-operated rock splitter |
Oct. 2, 1984 |
| 4311343 |
Apparatus for breaking rock or concrete |
Jan. 19, 1982 |
| 4252375 |
Wear or thrust plates for hydraulic rock splitting apparatus |
Feb. 24, 1981 |
| 4215901 |
Hydraulically actuated tool for mechanically splitting rock-like material |
Aug. 5, 1980 |
| 4114951 |
Hydraulically actuated tool for mechanically splitting rock-like material |
Sep. 19, 1978 |
| 4114950 |
Method and apparatus for breaking a hard compact material such as rock or concrete |
Sep. 19, 1978 |
| 4099784 |
Method and apparatus for breaking hard compact material such as rock |
Jul. 11, 1978 |
| 4094181 |
Method in destructing chills and a device for carrying out the method |
Jun. 13, 1978 |
| 4072353 |
Thrust-impact rock-splitter |
Feb. 7, 1978 |
| 4042280 |
Method of breaking up objects |
Aug. 16, 1977 |
| 4040669 |
Self propelled excavating vehicle |
Aug. 9, 1977 |
| 4026602 |
Apparatus for mechanically breaking up stone or reinforced concrete |
May. 31, 1977 |
| 3995906 |
Rock-splitting apparatus |
Dec. 7, 1976 |
| 3957309 |
Apparatus for mechanically breaking up rock |
May. 18, 1976 |
| 3931997 |
Method for breaking concrete structures |
Jan. 13, 1976 |
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