Patents by Inventor Helga Kaiser

Helga Kaiser 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).

  • Dye mixtures
    Patent number: 4731094
    Abstract: Mixtures comprising 75 to 99% by weight of a dye of formula ##STR1## wherein X is hydrogen, chlorine, bromine or methyl, andKK is the radical of a coupling component that does not contain water solubilizing groups,and 1 to 25% by weight of a dye of formula ##STR2## wherein X and KK have the given meanings and Y is chlorine or bromine, are suitable for dyeing polyester materials.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: March 15, 1988
    Assignee: Ciba-Geigy Corporation
    Inventors: Helga Kaiser, Hans-Jorg Angliker, Peter E. Eugster