Dry gelatin addition to an emulsion/dispersion mixture
US5298389A · kind A · utility
3Cited by
15References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Sep 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is a method to add dry gelatin to a photographic emulsion in either a liquid or a solid form. The dry gelatin is added by entraining the dry gelatin in air to form a gaseous mixture of dry gelatin in air and directing this mixture into the solid or liquid photographic emulsion. An air eductor is used to deliver the dry gelatin. When adding dry gelatin to a solution, the rate is determined by the solution viscosity and volume. When adding the dry gelatin to a solid emulsion, the dry gelatin rate is not as critical but uniform addition is still needed to interdisperse the dry gel with the emulsion pellets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.