Photographic product for silver transfer images with polyvinylpyrrolidone in carbon black layer
US4489152A · kind A · utility
5Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Diffusion transfer film units and processes are disclosed wherein a silver transfer image is formed in an image layer separated from the silver halide emulsion by a layer containing carbon black. Inclusion of polyvinylpyrrolidone in the carbon black layer provides increased silver transfer density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.