Low methionine gelatino-peptizer tabular grain silver bromide and bromoiodide emulsions and processes for their preparation
US4713320A · kind A · utility
33Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1987 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Feb 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/047
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is directed to a process of precipitating for use in photography a thin, tabular grain silver bromide or bromoiodide emulsion employing a gelatino-peptizer comprised of less than 30 micromoles of methionine per gram and to an emulsion produced by this process. A variety of advantages can be realized, including a wider range of permissible bromide ion concentrations during precipitation, thinner and/or larger diameter tabular grains, a reduced rod population, and novel tabular grain forms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.