Mining roof support cylinder corrosion protection apparatus and method
US7377727B2 · kind B2 · utility
0Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2007 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Mar 16, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/03
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and the hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.