Patents by Inventor Richard Frank Dubnansky

Richard Frank Dubnansky 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).

  • Separation of amine from a phenolic compound
    Patent number: 7049471
    Abstract: A process comprises contacting a product mixture with a base, optionally in the presence of a polyhydric alcohol, to produce a base-treated mixture and distilling the base-treated mixture in which the product mixture comprises an aromatic amine and a phenolic compound.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: May 23, 2006
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl Andrew Renner, Richard Frank Dubnansky, Freddison A. Parsons, Richard T. Stimek, Zhihong Wu