Photographic element comprising a fogged, direct-positive heterodispersed silver halide emulsion and a fogged, direct-positive monodispersed silver halide
US3942986A · kind A · utility
11Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1974 |
| Grant date | Mar 9, 1976 |
| Priority date | — |
| Expiry date | Jun 3, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/141
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic direct-positive materials are described which comprise in admixture in a single layer or in superposed layers a monodispersed direct-positive emulsion and a heterodispersed direct-positive emulsion. By the use of both types of emulsions it is possible to obtain reduced contrast and good detail rendering in the high-light areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.