Patents by Inventor Alfred Seyberlich

Alfred Seyberlich 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 the preparation of 5-amino-2,4-dimethylacetanilide
    Patent number: 4540817
    Abstract: A process for the preparation of 5-amino-2,4-dimethylacetanilide by reduction of 5-nitro-2,4-dimethylacetanilide with hydrogen is disclosed characterized in that a crude mixture containing 5-nitro-2,4-dimethylacetanilide in admixture with at least one of its position isomers is hydrogenated in a water-miscible organic solvent which optionally contains water. The 5-amino-2,4-dimethylacetanilide is separated off from the reaction mixture by means of crystallization employing a mixture of water-miscible organic solvent and water.
    Type: Grant
    Filed: July 25, 1983
    Date of Patent: September 10, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Horst Behre, Heinz U. Blank, Alfred Seyberlich, Ferdinand Hagedorn