Security item using intensity of fluorescent materials, and user identification system using same
US12023952B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2020 |
| Grant date | Jul 2, 2024 |
| Priority date | — |
| Expiry date | Sep 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D2207/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is a security item using the intensity of fluorescent materials and a user identification system using same, the security item containing fluorescent materials that have intrinsic luminescent characteristics when irradiated with excitation light, wherein the fluorescent materials are contained in an amount of 0.2-3.0 wt % on the basis of the weight of the security item, and the difference in relative value calculated by formula (I), according to a 0.2-0.5 wt % difference in the amount of the fluorescent materials, is at least 3. Formula (I): the relative value of χ wt % of fluorescent materials=(the relative intensity of the emission wavelength of χ wt % of the fluorescent materials×100)/(the relative intensity of the emission wavelength of 3.0 wt % of the fluorescent materials).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.