Direct-positive silver halide emulsions
US4073652A · kind A · utility
2Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1975 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Aug 26, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/48515
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method is described of increasing the stability of direct-positive silver halide emulsions comprising reduction- and gold-fogged silver halide grains by the step of adding to the emulsion subsequent to the fogging, a sulphite and a gold compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.