Polymeric photo-chromic composition
US5936878A · kind A · utility
19Cited by
13References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Dec 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00552
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to the field of photo-chromic materials, in particular, to photo-chromic compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for computers, multimedia applications and the like. In particular, nonfluorescent spiropyrane is transformed into fluorescent merocyanine by electromagnetic radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.