Substrate with a modified liquid crystal polymer marking
US8821756B2 · kind B2 · utility
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11References
33Claims
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Key dates
| Filing date | May 24, 2012 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Nov 28, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24835
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention relates to a marking on an item or substrate, which marking is based on a chiral nematic (also called cholesteric) liquid crystal precursor composition. Prior to curing the chiral liquid crystal precursor composition in the chiral liquid crystal state at least one optical property exhibited by the composition is modified by two modifying agents of different types in at least one area of the item or substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.