Mine emergency refuge systems
US9476217B2 · kind B2 · utility
1Cited by
5References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2013 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Sep 8, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F11/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An emergency refuge system relating to improved occupant access and air revitalization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.