Photochromic articles
US6113812A · kind A · utility
16Cited by
12References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1997 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Aug 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photochromic article that includes a host material and a photochromic amount of a benzopyran compound, the benzopyran compound represented by one of the formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.