Security of buildings and other structures
US5660021A · kind A · utility
21Cited by
16References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Sep 18, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2419/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An improved security door is provided that is a composite of multiple layers. The layers include a first hard layer, a second hard layer, a reinforcing layer disposed between and connecting the first and second hard layers, and a carbonizing layer provided adjacent the reinforcing layer. Other layers, either singularly or in combination, can be included to make the security door further resistant to penetration by various tools. The other layers can include a clogging layer, a mobile layer, a resilient layer, and further reinforcement layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.