Photochromic naphthopyran compounds
US5066818A · kind A · utility
197Cited by
10References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Mar 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel reversible photochromic naphthopyran compounds having at least one ortho substituted phenyl group at the 3-position of the pyran ring. 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(indolino)-oxazine type compounds, are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.