Patents by Inventor Christa Uhde

Christa Uhde 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: 4773937
    Abstract: The invention relates to pasty pigment formulations of pigments of the arylpararosanilinesulfonic acid series, which are free of aromatics-containing mineral oils and are suitable for preparing printing inks, in particular letterpress and offset printing inks. The pigment formulations are obtainable by flushing aqueous presscakes of the pigments by means of the solution of a flushing resin in aromatics-free mineral oil and preparing the flushed paste obtained with an oil- or fatty-acid modified alkyd resin.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: September 27, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Schneider, Christa Uhde, Manfred Zimmermann
  • 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
  • Patent number: 4145182
    Abstract: Disperse dyestuffs which are sufficiently capable of subliming for serving in the transfer print process but which yield printing inks of a too high viscosity can be finished to fit the requirements for printing inks for transfer printing by treating said dyestuffs in a liquid medium at a temperature between 50.degree. and 180.degree. C. Thus printing inks of sufficiently low and constant viscosity can be obtained.
    Type: Grant
    Filed: February 2, 1978
    Date of Patent: March 20, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Konrad Opitz, Christa Uhde