Photographic multilayer direct-positive silver halide element
US3963494A · kind A · utility
0Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1974 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Jan 11, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/143
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic multilayer direct-positive silver halide element is provided comprising at least two direct-positive fogged silver halide emulsion layers the undermost emulsion layer comprising one or more non-spectrally sensitizing electron acceptors and the uppermost emulsion layer comprising one or more electron-acceptors at least one of which is a spectrally sensitizing electron acceptor. The direct-positive element has reduced gradation and extended exposure latitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.