Silver halide photographic material
US5747237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | May 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/59
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic material comprising a support having at least one pre-fogged direct positive emulsion layer provided on at least one side of the support, wherein silver halide grain formation of the emulsion is carried out in the presence of a silver halide solvent, the emulsion contains at least one of an Rh salt, an Ru salt or a polybromoiridium salt, and at least one compound selected from the group consisting of compounds represented by the following formula (I), (II) and (III) is added to the emulsion while the silver halide photographic material is prepared: EQU R--SO.sub.2 S--M (I) EQU R--SO.sub.2 S--R.sup.1 (II) EQU R--SO.sub.2 S--L.sub.m --SSO.sub.2 --R.sup.2 (III) wherein R, R.sup.1 and R.sup.2 are the same or different, and each represents an aliphatic group, an aromatic group or a heterocyclic group; M represents a cation; L represents a divalent linking group; and m represents 0 or 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.