Stabilized black-and-white developing compositions and methods of use
US6686135B2 · kind B2 · utility
0Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Feb 26, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A black-and-white photographic developing composition or developing kit includes an ascorbic acid developing agent and is essentially free of hydroquinone and similar developing agents. The developing composition further includes a water-miscible hydroxy-containing organic solvent having a molecular weight of from about 50 to about 200. The weight ratio of the organic solvent to water is from about 0.1:1 to about 8:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.