Photochromic compounds and compositions
US8920928B2 · kind B2 · utility
2Cited by
37References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2011 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Jan 17, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Described herein are compounds generally comprising an indeno[2′,3′:3,4]naptho[1,2-b]pyran structure. Such compounds may be useful for their photochromic properties, and be used in certain photochromic compositions. Such compositions may further comprise other photochromic compositions and/or materials. Additionally, such compounds and/or compositions may be suitable for preparing certain photochromic articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.