Patent · US Active

Zero order pigments (ZOP)

US7864424B2 · kind B2 · utility

5Cited by

4References

15Claims

0Family size

Assignee

CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA—RECHERCHE ET DÉVELOPPEMENT · CH

Inventors

Alexander Stuck · Wettingen, CH
Harald Walter · Horgen, CH

Key dates

Filing date	May 31, 2007
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Apr 13, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09C2210/40
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

One or more zero-order diffractive pigments (ZOP) having both a particle distribution matrix material, and a layer of material in or on such a matrix material and having an index of refraction higher than that of the matrix material, and having a diffractive grating structure with a period in the range of 100 to 600 nm, which is smaller than the wavelength of light reflectable thereby in the zeroth reflection order. In such ZOPs the index of refraction of the matrix material is usually at least 0.25 less than that of the material of the layer, and the layer is typically of a thickness between 30 and 500 nm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.