Developer composition and method of development for photographic color negative films
US6649331B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2002 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | May 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2007/3043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Rapid development of silver bromoiodide color negative photographic films and formation of high quality negative images suitable for scanning to produce display images of excellent quality is made possible by a novel developer solution composition and method of development. The solution is characterized by containing, in addition to the color developer compound and conventional photographic developer solution components, a water soluble pyrrolidone polymer, a high concentration of sulfite ion and a low concentration, or the absence of, bromide ion. In the novel method the developer composition contacts the exposed film at elevated temperature, e.g., 40 to 66° C., for a short development time, e.g., 20 to 90 seconds. The developed image has image quality suitable for scanning and digital manipulation to produce a digital record for forming a color display image of high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.