Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
US4451557A · kind A · utility
20Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1983 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Feb 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/34
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus; PA1 Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms; and R.sup.1 is hydrogen or methyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.