Photochromic optical article
US7884992B1 · kind B1 · utility
13Cited by
0References
4Claims
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Assignee
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Key dates
| Filing date | Aug 13, 2009 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Aug 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photochromic optical article comprises a substrate, and a photochromic coating coated on an outer surface of the substrate and having at least two photochromic layers. Each of the photochromic layers has a composition that contains a carrier and at least one photochromic dye. The compositions of the photochromic layers are different from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.