Photographic elements containing scavengers for oxidized developing agent
US5561035A · kind A · utility
1Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Feb 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39216
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved photographic element comprises a support bearing at least one silver halide emulsion layer having associated therewith a pyrocatechol compound that functions as a scavenger for oxidized developing agent. The pyrocatechol compound has sufficient bulk that it is substantially non-diffusible in the photographic element and has in the four-position thereof a tertiary carbamoyl substituent. These scavenger compounds exhibit very high activity, have excellent stability upon long-term storage and do not leave colored residues after processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.