Optically detectable marker including luminescent dopants and system and method for reading such markers
US11043058B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2018 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Jan 22, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/202
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An optically detectable marker having a matrix material, which is doped with individual luminescent dopants, including a first luminescent dopant and a second luminescent dopant. The first luminescent dopant includes a first unique absorption band such that the first dopant may be excited by illumination of a first wavelength. The first dopant is distributed in the matrix material so as to form a first spatial pattern in the matrix material, which pattern may be optically detected by illuminating the marker by a light source illuminating light of the first wavelength. The second luminescent dopant includes a second unique absorption band such that the second dopant may be excited by illumination of a second wavelength, different from the first. The second dopant is distributed in the matrix material so as to form a second spatial pattern in the matrix material, which pattern may be optically detected by illuminating the marker by a light source illuminating light of the second wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.