Authentication of articles by white light interferometry and birefringence
US10175039B2 · kind B2 · utility
0Cited by
7References
8Claims
0Family size
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Key dates
| Filing date | Sep 9, 2011 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | Jul 1, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/164
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention provides a method of authenticating the provenance of an article marked with a removable transparent polymer film comprising measuring the thickness of the removable transparent film while still located on the article or of a layer within the film while still located on the article by white light interferometry. Alternatively, or in addition, the method comprises measuring the birefringence of the removable transparent polymer film while still located on the article or of a layer within the film while still located on the article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.