Patents by Inventor Ernest Stephen Cleugh

Ernest Stephen Cleugh 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 process of optically pure 2-(4- hydroxyphenoxy)-propionic acid compounds
    Patent number: 7268249
    Abstract: A process for producing optically pure R-hydroxyphenoxypropanoic acid or a salt or ester thereof by reaction of hydroquinone or a salt thereof with an S-halopropanoic acid or a salt thereof in the presence of a mild reducing agent.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: September 11, 2007
    Assignee: Syngenta Limited
    Inventor: Ernest Stephen Cleugh