Photochromic heterocyclic fused indenonaphthopyrans
US5723072A · kind A · utility
102Cited by
37References
23Claims
0Family size
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Key dates
| Filing date | Mar 18, 1997 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Mar 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Described are novel photochromic heterocyclic fused indenonaphthopyran compounds having a substituted or unsubstituted heterocyclic ring fused to the g, h, i, n, o or p side of the indenonaphthopyran. These compounds may be represented by either of the following graphic formulae: ##STR1## Also described are polymeric organic host materials that contain or that are coated with such compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.