Patents by Inventor Donald C. Ruopp

Donald C. Ruopp 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).

  • Borate reduction of nitrophenols
    Patent number: 4264526
    Abstract: A process for the direct production of aminophenol and N-acetyl-p-aminophenol from nitrophenols using a borate ion additive during hydrogenation to eliminate undesirable by-products and color formation.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: April 28, 1981
    Assignee: Penick Corporation
    Inventors: Donald C. Ruopp, Mark A. Thorn