Patents by Inventor John W. Forsberg

John W. Forsberg 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 of rerefining oil by dilution, clarification and extraction
    Patent number: 4154670
    Abstract: Used oil is rerefined by diluting it with a non-polar diluent, removing insoluble impurities from the resulting solution, extracting said solution with an immiscible liquid extractant to remove further impurities, and finally removing extractant and diluent from the oil.
    Type: Grant
    Filed: January 10, 1977
    Date of Patent: May 15, 1979
    Assignee: The Lubrizol Corporation
    Inventor: John W. Forsberg