Photochromic naphtho [2,1-b]pyran compounds containing bithienyl or terthienyl substituents, process for their manufacture, and photochromic materials and articles obtained
US6312811A · kind A · utility
76Cited by
1References
12Claims
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Key dates
| Filing date | Jul 8, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Jul 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The photochromic compounds of the invention correspond to the formula: ##STR1## in which Th.sub.2 represents a bithienyl group in one of the positions 5 to 10 of the naphthenic ring system system, R.sup.1 denotes a bithienyl or trithienyl group and R.sup.2 denotes a bithienyl, trithienyl, aryl, naphthyl, thienyl, furyl, pyrrolyl or N-alkylpyrrolyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.