Patents by Inventor John D. Engfehr

John D. Engfehr 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).

  • System and method for evaluating automotive vehicle oil deterioration
    Patent number: 6580366
    Abstract: A method and system is provided for evaluating the chemical deterioration of automotive engine oil over time. A change in oil quantity is detected and measured by an oil quantity sensor. Based on the change in quantity of oil, the level of chemical deterioration of the oil is inferred.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: June 17, 2003
    Assignee: Ford Global Technologies, LLC
    Inventor: John D. Engfehr