Patents by Inventor Donald I. Fields, Jr.

Donald I. 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).

  • Peroxide process for producing n-phosphonomethylglycine
    Patent number: 5077431
    Abstract: A process is provided for producing N-phosphonomethylglycine by the oxidation of N-phosphonomethyliminodiacetic acid with a peroxide to form an intermediate N-phosphonomethyliminodiacetic acid-N-oxide. Thereafter, the N-phosphonomethyliminodiacetic acid-N-oxide is converted to N-phosphonomethylglycine by adding a catalytic amount of a metal selected from the group consisting of iron, zinc, aluminum, vanadium and copper, or a compound selected from the group consisting of water-soluble vanadium compounds, ferrous salts and cuprous salts.
    Type: Grant
    Filed: April 15, 1991
    Date of Patent: December 31, 1991
    Assignee: Monsanto Company
    Inventor: Donald I. Fields, Jr.