Thin film optical variable article having substantial color shift with angle and method
US4705356A · kind A · utility
236Cited by
3References
28Claims
0Family size
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Key dates
| Filing date | Jul 13, 1984 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Jul 13, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Thin film optically variable article having substantial color shift with varying angle of light incidence and viewing and including an optically thick, substantially transparent element carrying a colorant and having first and second surfaces. A multilayer interference coating is carried on one of said first and second surfaces. The colorant serves to modify in essentially a subtractive mode the color at normal incidence and the color shift with angle of the multilayer interference coating as seen by reflection or transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.