Pigment with a metallic luster

US6929690B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Reiner Vogt · Darmstadt, DE
• Gerhard Pfaff · Mainburg, DE
• Stephanie Andes · Hanau, DE
• Michael Uhlig · Darmstadt, DE
• Martin Friz · Darmstadt, DE
• Katsuhisa Nitta · Iwaki, JP

Key dates

• Filing date: Sep 27, 2002
• Grant date: Aug 16, 2005
• Expiry date: Sep 27, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/88
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A pigment with a metallic luster, comprising a wafer-like substrate made of aluminium dioxide having a thickness of more than 250 nm and less than 1 μm, which is fully enveloped by a metal layer.