Oil soluble photographic coupler reclamation process
US4234392A · kind A · utility
2Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1978 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Jul 24, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for reclaiming a photographic coupler from an aqueous oil-in-water emulsion of a coupler solvent oil having an oil-soluble photographic coupler dissolved therein comprising separating the coupler solvent oil containing the photographic coupler dissolved therein from the aqueous oil-in-water emulsion, and subjecting the separated coupler solvent oil containing the photographic coupler dissolved therein to a high vacuum molecular distillation whereby only the coupler solvent oil is removed as a distillate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.