Photochromic naphthopyran compounds
US5274132A · kind A · utility
218Cited by
11References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Sep 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described are novel reversible photochromic naphthopyran compounds, examples of which are 3-aryl-3-arylalkenyl naphthopyrans. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.