Color developer concentrate for color film processing
US6998227B2 · kind B2 · utility
0Cited by
6References
17Claims
0Family size
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Key dates
| Filing date | Jul 16, 2004 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Jul 16, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form and an organic antioxidant. The concentrate also includes a water-miscible or water-soluble organic co-solvent and a quaternary ammonium salt to enhance its stability. The concentrate can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution, and is particularly useful for processing color negative or color reversal photographic silver halide films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.