Patents by Inventor Hilton Duke

Hilton Duke 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).

  • Method for cleaning fouled ion exchange resins
    Patent number: 6080696
    Abstract: Methods are disclosed for the regeneration of fouled ion exchange (IX) resins. In one embodiment, the fouled resin is treated simultaneously with reducing agent and acid. In a preferred embodiment, fouled resin is treated with reducing agent and then with acid. Use of reducing agent prior to the use of acid results in surprisingly unexpected improved cleaning as compared to simultaneous treatment with reducing agent and acid.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: June 27, 2000
    Assignees: MidAmerican Energy Holdings Company, The Dow Chemical Company
    Inventors: Hilton Duke, John L. Featherstone, Charles R. Marston