Patents by Inventor Alfred W. Operhofer

Alfred W. Operhofer 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).

  • Prevention of iron fouling of ion exchange resins
    Patent number: 4664811
    Abstract: A process for removing and preventing iron contamination of water treatment solids which tend to become iron fouled which comprises cyclically treating said water treatment solids with an aqueous solution containing an effective amount of:(a) a reducing agent;(b) a chelating agent;with a pH of said treating solution having been adjusted to within a range of about 4-6.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: May 12, 1987
    Assignee: Nalco Chemical Company
    Inventor: Alfred W. Operhofer