Silver halide photographic materials comprising silver bromide or bromoiodide emulsions having triangular tabular crystals
US5733715A · kind A · utility
3Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1996 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Jul 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/03594
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-sensitive silver bromide or silver bromoiodide emulsion is provided, comprising silver bromide or silver bromoiodide tabular triangular grains, said tabular triangular grains having an average grain thickness of less than 0.3 .mu.m, an average crystal diameter of at least 0.6 .mu.m; an average aspect ratio of at least 2:1; a variation coefficient of less than 40%, said grains accounting for a total projective area of at least 30%; characterized in that the thickness ratio of triangular tabular grains to hexagonal tabular grains is from 1.3 to 0.7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.