Direct positive emulsions containing fogged, monodispersed silver halide grains having more than 10 mile % iodide

US4045228A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Willy Joseph Vanassche · Aartselaar, BE
• Herman Alberik Pattyn · Kapellen, BE
• Otto Lapp · Leverkusen, DE
• Sieghart Klotzer · Cologne, DE
• Erik Moisar · Cologne, DE

Key dates

• Filing date: Nov 20, 1973
• Grant date: Aug 30, 1977
• Expiry date: Nov 20, 1993

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/48515
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Direct positive silver halide emulsions are provided which contain fogged homodisperse silver halide grains having a silver iodide content of more than 10 mole % and at most 20 mole % relative to the total amount of silver halide. These emulsions have higher sensitivity than corresponding fogged emulsions with less silver iodide content.