Direct positive dimethine cyanine dyes containing 1-aryl-2-heteroaryl indole nucleus
US5004812A · kind A · utility
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Key dates
| Filing date | Jan 22, 1990 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Jan 22, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/4853
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Compounds as defined having a 1-phenylindole nucleus substituted in the 2-position with a 3-pyridyl group. Such compounds are useful in the preparation of cyanine dyes which can be used to sensitize silver halide emulsions for fogged direct-positive films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.