Spectrally sensitized photographic silver halide emulsion
US3932186A · kind A · utility
5Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1974 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Jan 2, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Improved green-sensitivity is imparted to a photosensitive silver halide emulsion by a benzimidazolothiacarbocyanine dye of the formula: ##SPC1## Wherein R.sup.1 and R.sup.2 are lower alkyl; R.sup.3 is sulfoalkyl or carboxyalkyl each having an alkylene chain of from 1 to 4 carbon atoms inclusive; R.sup.4 is hydrogen, halogen, lower alkyl, lower carbalkoxy, lower alkoxy or acetamido; R.sup.5 is halogen, cyano or carbalkoxy; R.sup.6 is hydrogen or halogen; Y is an anion customary in the cyanine dye art; and n is 0 or 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.