Patents by Inventor John H. Steffens

John H. Steffens 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).

  • Process for the production of lubricating blend stocks
    Patent number: 4234409
    Abstract: In the production of lubricating oil blend stocks obtained by the distillation, extraction, dewaxing and clay contacting of atmospheric crude distillation column residue, the improvement comprising using a hydrogenated gas oil to supplement the atmospheric crude distillation column residue feedstock.
    Type: Grant
    Filed: February 28, 1979
    Date of Patent: November 18, 1980
    Assignee: Standard Oil Company
    Inventors: Richard D. Schieman, John H. Steffens