Solid marking composition as writing means, a writing instrument, an optically variable marking layer and use of a plurality of optically variable pigments
US6793720B2 · kind B2 · utility
5Cited by
12References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Sep 26, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D13/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A solid marking composition comprises a solid matrix containing at least one type of optically variable interference pigment flakes. The solid marking composition provides a document or article with a copy and counterfeit protection feature, and is preferably used in a writing instrument for applying hand-written anti-counterfeit markings and signatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.