Patents by Inventor Eileen G. Edwards

Eileen G. Edwards 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 purifying hydrogen fluoride
    Patent number: 5108559
    Abstract: A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of oxidizable impurities by electrolytically oxidizing the impurities. Specifically, trivalent arsenic impurity in the anhydrous hydrogen fluoride is oxidized to a non-volatile pentavalent arsenic compound. The resultant solution is distilled to recover high purity anhydrous hydrogen fluoride with low levels of arsenic impurity.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: April 28, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kaye L. Motz, Francisco J. Freire, Eileen G. Edwards
  • Process for purifying hydrogen fluoride
    Patent number: 5100639
    Abstract: A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of oxidizable impurities by electrolytically oxidizing the impurities. Specifically, trivalent arsenic impurity in the anhydrous hydrogen fluoride is oxidized to a non-volatile pentavalent arsenic compound. The resultant mixture is distilled to recover high purity anhydrous hydrogen fluoride with low levels of arsenic impurity.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: March 31, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Francisco J. Freire, Jon L. Howell, Kaye L. Motz, Craig T. Barker, William C. Ziegenhain, Eileen G. Edwards