Squarylium dyes and products and processes using same
US5211885A · kind A · utility
8Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1991 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Jun 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A novel class of squarylium infrared absorbing dyes is disclosed which are prepared by the condensation of squaric acid with a benzoxazinone. The dyes are unique in that they possess the desirable properties of squarylium dyes in general along with a narrow band of peak absorbency greater than 1000. Because of their stability to laser beams, the dyes are particularly useful in ocular products for eye protection against lasers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.