Patents by Inventor Malcolm B. Nield

Malcolm B. Nield 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 process for aminoanthraquinone derivatives
    Patent number: 5196553
    Abstract: A process for the preparation of aminoanthraquinone derivatives comprises reacting (A) bromaminic acid or a metal salt thereof with (B) an amine or amide in an aqueous alkaline medium in the presence of a copper (I) salt formed by in situ reduction of a copper (II) salt.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: March 23, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: John H. Brady, Peter J. Brogden, Malcolm B. Nield