Silver halide emulsions containing aromatic latent image stabilizing compounds
US4423140A · kind A · utility
8Cited by
5References
17Claims
0Family size
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Key dates
| Filing date | — |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | — |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic silver halide emulsions are protected against latent image fading by aromatic latent image stabilizing compounds having the structure: ##STR1## wherein: R.sup.1 is hydrogen, alkyl, or aryl; PA1 R.sup.2 and R.sup.3 are each individually hydrogen, alkyl, alkoxy, carboxy, alkoxycarbonyl, or aminocarbonyl; PA1 X is a middle chalcogen; PA1 Z represents the atoms completing an aromatic nucleus; PA1 n is an integer of 1 or 2; and PA1 M.sup..sym.n is a cation of valence n chosen from the group consisting of an onium ion, an ion from Group IA or IIA, and a metal ion from Group IIB, VIIB, IVA, or VA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.