Optical article with gradient photochromism
US9678363B2 · kind B2 · utility
3Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2014 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Sep 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/107
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is drawn to an optical article comprising: (a) a photochromic substrate comprising at least one photochromic dye, and (b) an interference coating having a specific gradient thickness providing for a gradient reflectance. It also pertains to a process for making such an optical article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.