Tamper evident optical device and article utilizing the same
US4840281A · kind A · utility
8Cited by
3References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Jan 25, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D55/066
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Tamper evident optical device having at least first and second layers with a spacer layer therebetween and providing a desired optical property. A release layer is disposed between the first and second layers which permits the first and second layers to be separated from each other and to destroy the desired optical property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.