Photographic print elements containing cubical grain silver iodochloride emulsions
US5728516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | May 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic print elements are disclosed of enhanced speed and controlled minimum densities provided by emulsion layer units that contain emulsions that are blends of (a) cubical silver iodochloride grains that contain iodide in a controlled, non-uniform distribution forming a core containing at least half of total silver, a iodide-free surface shell having a thickness of greater than 25 .ANG., and a sub-surface shell that contains a maximum iodide concentration and (b) minimum density controlling silver halide grains that are of smaller mean grain size than the silver iodochloride grains and that consist essentially of chloride and/or bromide and are present in a molar concentration at least equal to that of silver iodide in the silver iodochloride grains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.