Patents Examined by Gerald Letscher
  • Patent number: 5270157
    Abstract: A colour photographic silver halide material having at least one silver halide emulsion layer which contains at least one colour coupler and in which the silver halide grains contain from 40 to 90 mol. % of AgCl and at least two zones differing in halide composition, the chloride content of the outer zone being at least 10 mol. % higher than that of the inner zone, which silver halide emulsion layer is associated with a DIR compound whose reaction with the oxidized colour developer has a rate constant k>2000 [1/mol.s] is distinguished by excellent sharpness and colour reproduction even when processed by a high speed process.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: December 14, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Bell, Cuong Ly