Patents by Inventor Christa Uhde nee Schilling

Christa Uhde nee Schilling 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).

  • Process for preparing pigment granules from aqueous suspension of pigment and alkaline solution of resin
    Patent number: 4729796
    Abstract: Easily dispersible dust-free pigment granules of high tinctorial strength are obtained by adding to the aqueous suspension of a finely divided pigment, an alkaline solution of from 25 to 90 weight percent based on the weight of the granules obtained, of colophony or a colophony derivative, acidifying the mixture, subjecting it to a flush process while stirring and heating to a temperature, above the softening point of the resin, up to 100.degree. C. and isolatng the granules obtained. The granules are particularly suitable for preparing printing inks which are distinguished by a very high tinctorial strength, a good transparency and a low viscosity.
    Type: Grant
    Filed: October 14, 1981
    Date of Patent: March 8, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhold Deubel, Christa Uhde nee Schilling, Werner Marx