Timing layers for color transfer assemblages containing positive-working redox dye-releasers and development accelerators
US4375506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1981 |
| Grant date | Mar 1, 1983 |
| Priority date | — |
| Expiry date | Oct 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic assemblages, elements, receiving elements and cover sheets comprise a combination of two timing layers and a neutralizing layer for use with negative-working silver halide emulsions and positive-working redox dye-releasers. The outermost timing layer has a negative temperature coefficient and has a development accelerator associated therewith to increase the development of the silver halide emulsion at low temperatures. The timing layer next to the neutralizing layer has a greater penetration time by the alkaline processing composition so that the neutralizing layer is permeated only after silver halide development has been substantially completed. The temperature latitude of the system is thereby increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.