Patents by Inventor Christa Dacke

Christa Dacke 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).

  • Bleaching bath
    Patent number: 5266449
    Abstract: A bleaching bath for processing of a color photographic silver halide material which contains the ferric complex of alaninediacetic acid as the bleaching agent and in a dye-stabilizing amount a formaldehyde precursor of the formula ##STR1## wherein X and Y denote the residual atoms of a hetero aromatic 5- or 6-membered ring,yields color photographic images with excellent dye-stabilizing. In the atmosphere above the stabilizing bath no formaldehyde is detectable.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: November 30, 1993
    Assignee: Agfa Gevaert AG
    Inventors: Christa Dacke, Heinrich Odenwalder, Hans Langen