Mining oil shale and backfilling with mechanically compressed spent shale
US4081968A · kind A · utility
0Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1977 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Feb 16, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C41/31
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The producing of shale oil by mining and retorting oil shale is improved by compressing the spent shale into a mass that is capable of both fitting within the mined out volume and supporting the overburden.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.