Patents by Inventor Fritz Guellich

Fritz Guellich 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).

  • Preparation of easily dispersible and deeply colored pigmentary forms
    Patent number: 4298526
    Abstract: A process for the preparation of pigmentary forms of phthalocyanine and of insoluble polycyclic compounds, wherein the crude pigment is milled in the presence of one or more acids which have a pK of <4.9 and are non-oxidizing under the milling conditions, until the primary particle size is .ltoreq.0.1 .mu.m, the milled material is then finished in the conventional manner in a solvent in the presence or absence of water, and the pigment is isolated.The pigments give very deep colorations and are very easily dispersible in the media in which they are used.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: November 3, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Reinhard Sappok, Fritz Guellich, Karl Roth, Alois Wiesenberger