Patents by Inventor J org Siegel

J org Siegel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5571664
    Abstract: A negatively developing color photographic silver halide material containing at least two blue-sensitive, yellow-coupling silver halide emulsion layers, at least two green-sensitive, magenta-coupling silver halide emulsion layers, at least two red-sensitive, cyan-coupling silver halide emulsion layers and a yellow filter layer on a transparent support, the layers of the same spectral sensitivity having different photographic sensitivities and the blue-sensitive layers being arranged further from the support than the yellow filter layer and the green-sensitive and red-sensitive layers being arranged nearer the support than the yellow filter layer, is distinguished by improved development kinetics if at least one of the green-sensitive layers of highest sensitivity and the red-sensitive layers of highest sensitivity contains a crown ether.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 5, 1996
    Assignee: Agfa-Gevaert AG
    Inventors: J org Siegel, Peter Hankofer, Hans-Ulrich Borst
  • Patent number: 5547818
    Abstract: A color photographic print material with the usual three different sensitized silver halide emulsion layers and at least one silver halide emulsion layer containing no color coupler (control layer) with a spectral sensitization range outside the sensitization range of the image-producing layers, wherein the control layer contains a substance A, which, on negative development of the silver halide emulsion used in the control layer (control emulsion), releases a compound B which alters the gradation of the image-producing layers, is usable as a print material with variable gradation.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: August 20, 1996
    Assignee: Agfa Gevaert AG
    Inventors: Otto Lapp, Arno Schmuck, Wolfgang Schmidt, J org Siegel