Chromene compounds and photochromic materials
US5808100A · kind A · utility
22Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/73
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photochromic compound which is initially colored less, exhibits excellent durability and features high color density and high color fading rate, and a photochromic material thereof. The photochromic compound basically has two aromatic heterocyclic groups or an aromatic heterocyclic group and a naphthyl group at the third position, and has a benzene ring that is condensed at the f-th position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.