Patents by Inventor Clara S. Dannhaus

Clara S. Dannhaus 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).

  • Method for decoloration of triethylenetetramine (TETA)
    Patent number: 4737243
    Abstract: A method of removing color from crude triethylenetetramine (TETA) is disclosed. In the preferred procedure, acid treated clay or acidic form zeolite are mixed with the TETA at elevated temperatures. After several hours exposure, the TETA is distilled to obtain a decolored product. The decoloration can be a continuous or batch process. The distillation is performed in the presence or absence of the catalyst.
    Type: Grant
    Filed: December 16, 1985
    Date of Patent: April 12, 1988
    Assignee: The Dow Chemical Company
    Inventors: Robert J. Siml, Clara S. Dannhaus, Enrique G. Ramirez