Multilayered structures and uses thereof in security markings
US11351710B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Dec 6, 2021 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Dec 6, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2005/1804
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A security marking has a physically unclonable function (PUF) wherein the PUF includes a disordered multilayer photonic crystal structure having an electromagnetic transmission and/or reflection spectrum and/or spectra upon receipt of electromagnetic radiation within a photonic bandgap region of the structure that is unique to the structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.