Zero-order diffractive pigments
US7974010B2 · kind B2 · utility
4Cited by
4References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2007 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Jun 14, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09C2220/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention relates to pigments comprising or consisting of a layer made of a material with an index of refraction that is higher than the index of refraction of the adjacent material by at least 0.25; whereas said layer has a zero-order diffractive micro-structure; whereas said layer acts as an optical waveguide and whereas said layer has a thickness between 50 nm and 500 nm; to processes for its manufacture and to its use. These pigments show a color effect upon rotation and/or tilting, and it is believed that this color effect is based on zero-order diffraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.