Arylidene pyrazolone coupler
US5262284A · kind A · utility
9Cited by
9References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1991 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Jul 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element including a support bearing a silver halide photographic emulsion and an image dye-forming coupler, wherein the image dye-forming coupler includes a ballasted arylidene pyrazolone which is also a filter dye that upon exposure and processing of the element is destroyed in both exposed and unexposed areas of said element or a masking coupler that upon exposure and processing is destroyed only in exposed areas of the element. The arylidene pyrazolone compound includes an oxygen-inclusive electron donating group in conjugation with the arylidene function, preferably positioned para to the arylidene function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.