Photochromic indeno-fused naptho2,1-b!pyrans
US5869658A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Described are novel photochromic indeno-fused naphthopyran compounds having certain substituents at the 2-position of the pyran ring and an alkoxy group at the number 6 carbon atom. Certain other substituents may also optionally be present at the number 5, 7, 8, 9, 10, 11, 12 or 13 carbon atoms of the compounds. These compounds may be represented by the following graphic formula: ##STR1## Also described are certain novel indeno-fused naphthols which are used to make the novel naphthopyran compounds. Further described are polymeric organic host materials that contain or that are coated with the novel naphthopyran compounds, or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, benzopyrans, and spiro(indoline)type compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.