Photochromic spiropyran compounds
US5241075A · kind A · utility
3Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Apr 14, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/244
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel photochromic spiropyran compounds having an absorption sensitivity in a longer wavelength region than known photochromic compounds are provided. The novel spiropyran compounds have a spiropyran skeleton having a methoxy group at the 6 position, a nitro group at the 8 position, a bromine atom at the 5' and 7' positions, and an alkyl group at the 1' position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.