Fused ring indeno compounds for preparation of photochromic compounds
US9029565B1 · kind B1 · utility
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10Claims
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Key dates
| Filing date | Nov 20, 2013 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Dec 13, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2019/3408
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to intermediate compounds represented by the following Formula (I-A),The intermediate compounds of the present invention, such as represented by Formula (I-A), can be used to prepare photochromic compounds, such as photochromic fused ring indenopyran compounds, including but not limited to photochromic fused ring indeno-naphtho-pyran compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.