Process for preparing slightly soluble silver salt grains
US4157289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1978 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | May 8, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/0357
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process for preparing slightly soluble silver salt grains by mixing a solution or dispersion of a silver salt forming agent as a first liquid with a solution or dispersion of a silver ion-providing agent as a second liquid while controlling the electrode potential of the mixture of the first liquid and the second liquid using a measuring electrode and a reference electrode to produce the slightly soluble silver halide grains of specific characteristics depending upon the control of the electrode potential, the improvement which comprises the reference electrode comprising an internal electrode of a metal immersed in an internal solution of a metal salt of the metal of the internal electrode and an electrolyte, which metal salt and electrolyte do not release halide ions in the same liquid present as the major component in either of the first liquid or the second liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.