Grid composite for longwall shield recovery in underground coal and trona mines
US5199825A · kind A · utility
20Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Dec 6, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D11/152
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A grid composite for protecting men and longwall mining equipment during longwall shield recovery includes a regular polymer geogrid structure formed by biaxially drawing a continuous sheet of select polypropylene material which is heat bonded to a polyester fabric. The grid composite is secured over caving shields of longwall mining equipment during a longwall mining operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.