Photographic reversal bath concentrate and method of preparing same
US5736302A · kind A · utility
5Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/50
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic reversal bath concentrate is formulated in such a manner as to avoid precipitates while including new biocides and excluding propionic acid. The concentrate is prepared by adding stannous ion nucleating agent to a solution of an organic phosphonic or phosphinic acid chelating agent, followed by addition of a quaternary ammonium compound as the sole biocide at a concentration of at least about 1 g/l. The quaternary ammonium compound has a molecular weight of from about 175 to about 440.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.