Patents by Inventor Duncan Stuart Hugall

Duncan Stuart Hugall 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).

  • Production of terephthalic acid
    Patent number: 6307099
    Abstract: An aromatic carboxylic acid such as terephthalic acid is produced by the liquid phase oxidation of a precursor thereof, the oxidation being carried out in such a way that substantially all of the aromatic carboxylic acid produced in the course of the reaction is maintained in solution during the reaction.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: October 23, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John Arthur Turner, David John Royall, Duncan Stuart Hugall, Graham Howard Jones, Duncan Charles Woodcock