Identification medium, identification method, and identification apparatus
US8322753B2 · kind B2 · utility
1Cited by
1References
9Claims
0Family size
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Key dates
| Filing date | Oct 18, 2007 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Oct 24, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/41
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An identification medium is to be observed via a linearly polarizing filter and includes a first liquid crystal layer that changes the wavelength of light according to the rotational angle of the linearly polarizing filter, a cholesteric liquid crystal layer, and a light absorbing layer that is provided below the cholesteric liquid crystal layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.