Patents by Inventor Kurt C. Habig

Kurt C. Habig 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).

  • 4,4'-diaminodiphenyl compounds, process for their preparation and their use
    Patent number: 4987258
    Abstract: The invention relates to 4,4'-diaminodiphenyl compounds of the formula I ##STR1## in which X denotes the n-propyl, isopropyl, n-butyl, isobutyl, 1-methylpropyl, n-propoxy, isopropoxy, isobutoxy, 1-methylpropoxy or 2-methoxyethoxy radical and A is 0 or the equivalent of an inorganic acid.The preparation is effected by reducing ortho-X-substituted nitrobenzene and benzidine rearrangement of the resulting hydrazobenzene derivative. The compounds of the formula (I) are suitable for use as components in the preparation of dyes and pigments.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: January 22, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Hunger, Heinrich Frolich, Kurt C. Habig