Gradation variable black- and -white paper

US4987063A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Helmut Kampfer · Idar-Oberstein, DE
• Walter Patzold · Leverkusen, DE
• Gunther Mahlberg · Bensberg, DE

Key dates

• Filing date: Nov 10, 1988
• Grant date: Jan 22, 1991
• Expiry date: Nov 10, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/035
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A gradation variable black-and-white paper containing only one light sensitive silver halide emulsion layer in which transfer of sensitization is prevented may be obtained by sensitization with at least one compound corresponding to the following formula ##STR1## in which at least one of the groups R.sub.1, R.sub.5 or R.sub.6 is halogen.