Photochromic naphthopyrans
US5369158A · kind A · utility
85Cited by
15References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1993 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Jun 2, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/92
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. 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 are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.