Patents by Inventor Darwin D. Davis

Darwin D. Davis 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).

  • Process for the preparation of dodecanedioic acid
    Patent number: 5026461
    Abstract: A process for the production of dodecanedioic acid by oxidation of cyclododecene using a two phase system in which ruthenium tetroxide serves as the oxidizing agent in the organic phase, and ruthenium tetroxide is regenerated in the second phase, an aqueous phase containing cerium ions in the plus 4 state. The cerium plus 4 ions may be regenerated by electrolytic oxidation in a separate step.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: June 25, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Darwin D. Davis, David L. Sullivan