Patents by Inventor Darlene M. Hansen

Darlene M. Hansen 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).

  • Activated clay composition and method
    Patent number: 5908500
    Abstract: High performance acid activated clays suitable for bleaching oil are produced by contacting an intercalating clay mineral with a strong acid in a polar organic liquid.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: June 1, 1999
    Assignee: Oil-Dri Corporation of America
    Inventors: David D. Brooks, Darlene M. Hansen, Dov Shaked