All-dielectric optical diffractive pigments
US6815065B2 · kind B2 · utility
57Cited by
11References
25Claims
0Family size
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Key dates
| Filing date | Feb 11, 2003 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Feb 11, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
All-dielectric diffractive pigment flakes can be applied to an object to impart a diffractive effect to the object without substantially changing the background color of the object. In one case, such diffractive pigment flakes can be applied to a white object to impart a white diffractive effect. The thickness of the dielectric layers in the diffractive pigment flakes can be chosen to provide thin-film interference, as well as diffraction from the interfaces between layers patterned with a diffraction grating. In some cases, the thin-film interference can provide color shifting in addition to the diffractive effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.