Reversible redox-controlled imaging method
US5332654A · kind A · utility
1Cited by
4References
10Claims
0Family size
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Key dates
| Filing date | Jun 11, 1993 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | Jun 11, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A novel class of N-substituted triarylmethane sulfonamides is provided which undergo reversible oxidation into colored form and reversible reduction of the oxidized form into colorless form. Preferred embodiments comprise xanthene sulfonamides having N-aryl substituents, e.g., hydroquinone substituents. These compounds possess redox potentials ranging between about +200 to -500 millivolts and thus are useful as dyes for producing photographic, photothermographic, thermal, and pressure-induced images, as well as being useful as redox indicators in a wide variety of biological and chemical reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.