Silver halide photosensitive materials containing thiourea and analogue derivatives
US4749646A · kind A · utility
7Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Mar 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/07
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises an acid function. The urea compound is an effective silver halide grain growth-modifying agent. A process for modifying the grain growth of silver halide is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.