Optical article with blue cut, high UV cut and high clarity
US11029541B2 · kind B2 · utility
4Cited by
1References
19Claims
0Family size
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Key dates
| Filing date | Sep 20, 2017 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Feb 28, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The combination of selective and high pass filters to cut harmful blue light allowed to achieve the best compromise between high blue cut performance, high UV cut and low yellow index, not achievable when using the filters alone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.