Silver bromide emulsions of narrow grain size distribution and processes for their preparation
US4386156A · kind A · utility
48Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1981 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Nov 12, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/44
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Radiation-sensitive emulsions are disclosed containing tabular silver bromide grains bounded by two substantially parallel square or rectangular crystal faces and having an average aspect ratio of at least 8.5:1. The tabular grains preferably exhibit a coefficient of variation of less than 30. The tabular grains are formed by providing cubic seed grains having an edge length of less than 0.15 micron and ripening the seed grains at a pAg in the range of from 5.0 to 8.0 in the substantial absence of non-halide silver ion complexing agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.