Spectrally selective retroreflective system
US11640019B2 · kind B2 · utility
0Cited by
7References
7Claims
0Family size
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Key dates
| Filing date | Dec 1, 2016 |
| Grant date | May 2, 2023 |
| Priority date | — |
| Expiry date | Aug 27, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133524
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retroreflective system is disclosed that includes a retroreflective sheet for retroreflecting light, and a light control film disposed on the retroreflective sheet. For a first wavelength, light incident on the light control film at each of a first and second angles of incidence is retroreflected. For a second wavelength, light incident on the light control film at the first, but not the second, angle of incidence is retroreflected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.