System for monitoring and controlling supersaturation in AgX precipitations
US5422825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1993 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Aug 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/015
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention is a system and associated method for monitoring and controlling independently the supersaturation and halide ion concentration, during the precipitation of a silver halide emulsion in a precipitation vessel. The introduction of a silver salt is controlled in accordance with a predetermined program, which in turn is responding to the supersaturation signal measured in the vessel by a supersaturation sensor. The sensor is comprised of a true silver ion electrode and a silver-silver halide electrode. The introduction of the halide salt is controlled in accordance with the predetermined program, which in turn is responding to the halide ion concentration signal measured in the vessel by a silver-silver halide electrode and a reference electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.