Photographic negative material with at least one layer containing a desensitized silver halide emulsion
US4326021A · kind A · utility
1Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1981 |
| Grant date | Apr 20, 1982 |
| Priority date | — |
| Expiry date | Feb 11, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic negative material which has at least one layer which contains a desensitized silver halide emulsion, the desensitizer used being a trinuclear heptamethinecyanine or a halogenated trinuclear tetramethinecyanine which has three identical heterocyclic ring systems, which can have different substituents and are linked to one another by three identical methine systems, which can be mesomeric, is suitable for processing in subdued daylight but nevertheless has an adequate sensitivity on exposure to intense light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.