Process for spectral sensitization of a silver halide emulsion
US5077190A · kind A · utility
1Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/015
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Silver halide emulsions can be spectrally sensitized by adding a silver salt solution to them until the pAg value reaches a point close to equivalence, then adjusting the pAg value to a value between 7.5 and 10 by addition of halide or thiocyanate, adsorbing a part quantity of a sensitizing dye on the silver halide crystals of the emulsions, and repeating these steps once to seven times, and adding the residual quantity of sensitizing dye in the last repeat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.