Prestressed rock truss
US4274762A · kind A · utility
17Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Feb 26, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D20/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof support system for mines in which prestressed rock trusses are bolted to the roof of the mine with roof bolts which each extend beyond the width of the mine gallery and the method of installing said trusses into position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.