Optically encoded particles
US8765484B2 · kind B2 · utility
7Cited by
66References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2003 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Jan 10, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/144444
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a particle having a code embedded in its physical structure by refractive index changes between different regions of the particle. In preferred embodiments, a thin film possesses porosity that varies in a manner to produce a code detectable in the reflectivity spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.