Naphthols useful for preparing indeno-fused photochromic naphthopyrans
US7517982B2 · kind B2 · utility
1Cited by
55References
3Claims
0Family size
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Key dates
| Filing date | Mar 1, 2007 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Mar 1, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/259
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are naphthols useful in the manufacture of novel indeno-fused photochromic naphthopyran materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.