Silver halide precipitation process with deletion of materials
US4334012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/0157
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved silver halide precipitation process of preparing a dispersion of silver halide grains is disclosed. The process comprises forming a radiation-sensitive silver halide dispersion by reacting silver and halide salts in solution within a dispersing medium to form silver halide grain nuclei within the dispersing medium and allowing silver halide grain growth to occur in a reaction vessel in which the silver halide grain nuclei and the dispersing medium are present. The improvement comprises, while increasing silver halide present in the dispersing medium during silver halide grain growth, reducing the volume of the dispersion by separating a portion of the dispersing medium while retaining the silver halide grains within the remaining dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.