Patents by Inventor Elizabeth L. M. Cowton

Elizabeth L. M. Cowton 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).

  • Reductive alkylation process for the preparation of compounds containing at least two amino groups
    Patent number: 6245941
    Abstract: An alkylation process is described. The process comprises reacting at least a first nitrogen compound and a second nitrogen compound with a carbonyl compound in the presence of a reducing agent to form a product comprising at least two nitrogen groups; wherein the carbonyl compound comprises at least two carbonyl groups, the first nitrogen compound comprises a first nitrogen group reactive with one carbonyl group of the carbonyl compound and the second nitrogen compound comprises a second nitrogen group reactive with the other (or another) carbonyl group of the carbonyl compound, and wherein at least the first nitrogen compound or at least the second nitrogen compound comprises at least one other functional group. The process is especially suitable for the preparation of (S,S)-ethylenediaminedisuccinic acid (EDDS) of formula (1).
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: June 12, 2001
    Assignee: The Associated Octel Company Limited
    Inventors: Elizabeth L. M. Cowton, Derek A. Bassett