Oxygen-containing heterocyclic fused naphthopyrans
US6608215B2 · kind B2 · utility
13Cited by
18References
44Claims
0Family size
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Key dates
| Filing date | Sep 20, 2001 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Sep 20, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel naphthopyrans having an oxygen-containing heterocyclic group F annelated on the f, i, j, or k side of the naphthopyran ring. These naphthopyrans may have the formula (I) presented below: These compounds (I) have interesting photochromic properties. Various organic host materials that contain such compounds are described. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations are enabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.