Photochromic naphthopyran compounds: compositions and articles containing those naphthopyran compounds
US7008568B2 · kind B2 · utility
35Cited by
21References
14Claims
0Family size
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Inventor
Key dates
| Filing date | Nov 20, 2001 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Nov 20, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D493/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photochromic naphthopyran displays good color distribution when the naphthopyran has a central nucleus of the formula:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.