High-contrast image forming process
US5284733A · kind A · utility
6Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1991 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Oct 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic material is disclosed. The photographic material comprises a support having coated thereon one or more hydrophilic colloidal layers, at least one of the hydrophilic colloidal layers being a negative working silver halide emulsion layer, wherein said silver halide emulsion layer or another hydrophilic colloidal layer contains a water-soluble polymer or copolymer having a quaternary ammonium salt in a repeating unit. The process for forming a high contrast negative image using the photographic material is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.