Patents by Inventor Douglas H. Fenske

Douglas H. Fenske 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 increasing the brightness of limestone
    Patent number: 4239736
    Abstract: Method for improving the brightness of limestone utilizing a flocculating agent and a bleaching agent where the pH of the slurry is between about 7 and 9.
    Type: Grant
    Filed: February 26, 1979
    Date of Patent: December 16, 1980
    Assignee: Dresser Industries, Inc.
    Inventor: Douglas H. Fenske