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Class Information
Number: 299/20
Name: Mining or in situ disintegration of hard material > Expansible breaking-down devices
Description: Apparatus comprising a device which is inserted into an opening in hard material and is described as operated to apply such expansive pressure to the walls of the opening as to relatively move and break up the hard material.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6145934 |
Discharge destroying method, discharge destroying device and method of manufacturing the same |
Nov. 14, 2000 |
| 5087100 |
Method of fracturing rock or similar material and apparatus therefore |
Feb. 11, 1992 |
| 5024388 |
Stonework crusher |
Jun. 18, 1991 |
| 4740036 |
Splitting apparatus and method |
Apr. 26, 1988 |
| 4669783 |
Process and apparatus for fragmenting rock and like material using explosion-free high pressure shock waves |
Jun. 2, 1987 |
| 4363518 |
Method and apparatus for fracturing rock beds |
Dec. 14, 1982 |
| 4266827 |
Incompressible fluid type rock breaker |
May. 12, 1981 |
| 4226475 |
Underground mineral extraction |
Oct. 7, 1980 |
| 4193634 |
Method and apparatus for excavation |
Mar. 18, 1980 |
| 4168862 |
Wear or thrust plates for hydraulic rock splitting apparatus |
Sep. 25, 1979 |
| 4123108 |
Method and device for breaking a hard compact material |
Oct. 31, 1978 |
| 4114951 |
Hydraulically actuated tool for mechanically splitting rock-like material |
Sep. 19, 1978 |
| 3961824 |
Method and system for winning minerals |
Jun. 8, 1976 |
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