Multi-layer effect pigment
US6875264B2 · kind B2 · utility
45Cited by
13References
25Claims
0Family size
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Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Jan 17, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A multilayer effect pigment includes a transparent substrate, a layer of high refractive index material on the substrate, and alternating layers of low refractive index and high refractive index materials on the first layer, the total number of layers being an odd number of at least three, all adjacent layers differing in refractive index by at least about 0.2 and at least one of the layers having an optical thickness which is different from all of the other layers. The resulting multilayer effect pigment is not a quarter-wave stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.