Method and apparatus for identifying articles with a luminescent marker for recycling
US11318500B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Apr 19, 2018 |
| Grant date | May 3, 2022 |
| Priority date | — |
| Expiry date | Sep 30, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07C5/3427
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The composition of articles can be identified using luminescent codes printed or coated onto the articles (or labels on the articles) by means of an ink which contains long persistence luminescent materials. Radiation is used to excite the luminescent materials and this is then extinguished before the article passes beneath a spectrometer. An infrared beam then strikes the article in order to stimulate emission from the long persistence luminescent materials, via a detrapping mechanism, and the spectrometer detects the emission in order to identify the article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.