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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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