Photochromic compound
US5296607A · kind A · utility
2Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Jun 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/73
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In chemical structure of a fulgide type photochromic compound having the following general formula; ##STR1## introduction of electron donative groups into its heteroaromatic structure is effective in improving the long wave length sensitivity without any lowering in its thermal stability. Thanks to such combined functional properties, the products are advantageously used for optical recording media, copying media, printing media, optical filters and display materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.