Patents by Inventor Donald Lee Fields, Jr.

Donald Lee Fields, Jr. 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 of quinonediimines from phenylenediamines using a hypochlorite as an oxidation agent
    Patent number: 6114554
    Abstract: A phenylenediamine compound can be converted, with high selectivity, into its corresponding quinonediimine by reacting the phenylenediamine with a hypochlorite oxidation reactant.
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: September 5, 2000
    Assignee: Flexsys America L.P.
    Inventors: Jayant Shivji Lodaya, Raymond Anton Lohr, Jr., Donald Lee Fields, Jr.
  • Formation of quinonedimines from phenylenediamines by catalytic oxidation
    Patent number: 5959126
    Abstract: A phenylenediamine compound can be converted, with high selectivity, into its corresponding quinonediimine by reacting the phenylenediamine with oxygen in the presence of a modified activated carbon catalyst in an aqueous system.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: September 28, 1999
    Assignee: Flexsys America L. P.
    Inventors: Raymond Anton Lohr, Jr., Otto William Maender, Donald Lee Fields, Jr.