Photographic reversal composition and method of use
US6248511A · kind A · utility
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9Claims
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Key dates
| Filing date | May 10, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | May 10, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/407
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Color reversal photographic films are processed using a reversal solution comprising stannous ion and a quaternary ammonium compound as the sole microbial control agent, to reduce formation of visible biogrowth. The quaternary ammonium compound is present at very low concentrations of 1 to 20 ppm, and is preferably myristyltrimethyl ammonium bromide because it avoids precipitates with components that may leach out of some processed films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.