Uniformly mixed dry photographic processing composition and method of preparation
US5922521A · kind A · utility
0Cited by
9References
20Claims
0Family size
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Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A powdered, uniformly mixed photographic processing composition is prepared with intense mixing of dry photoprocessing chemical components, and by forming uniformly sized agglomerates of the mixed powder. During agglomeration, a solution of a binder material is applied in a controlled manner to enable the mixed powder particles to stick together but without leaving much residue in the final composition. With this process, the mixed powder and agglomerates each have desired uniformity in size and chemical composition. The resulting dry uniformly mixed composition is highly stable, dissolvable and substantially free of dust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.