Identifying medium, identifying medium manufacturing method, article, and identifying medium identifying method
US8168080B2 · kind B2 · utility
2Cited by
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18Claims
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Key dates
| Filing date | Aug 9, 2007 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Jan 27, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An identifying medium comprises a nematic liquid crystal layer for forming a latent image with gradation, and the nematic liquid crystal layer has a thickness distribution corresponding to the gradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.