Patents by Inventor John Hefferon

John Hefferon 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).

  • EVAPORATIVE EMISSION CONTROL SYSTEM AND DIAGNOSTIC METHOD
    Publication number: 20190368444
    Abstract: A method for diagnosing an evaporative emission control system that includes during a first state of a vapor blocking valve, determining a first rate of change of a fuel tank vacuum, during a second state of the vapor blocking valve different from the first state, determining a second rate of change of the fuel tank vacuum, and diagnosing an operational condition of the vapor blocking valve based on the first and second rates of change.
    Type: Application
    Filed: June 5, 2018
    Publication date: December 5, 2019
    Inventors: Aed M. Dudar, Mark Peters, Donald Ignasiak, Deborah Dukatz, John Hefferon
  • Evaporative emission control system and diagnostic method
    Patent number: 10495030
    Abstract: A method for diagnosing an evaporative emission control system that includes during a first state of a vapor blocking valve, determining a first rate of change of a fuel tank vacuum, during a second state of the vapor blocking valve different from the first state, determining a second rate of change of the fuel tank vacuum, and diagnosing an operational condition of the vapor blocking valve based on the first and second rates of change.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: December 3, 2019
    Assignee: Ford Global Technologies, LLC
    Inventors: Aed M. Dudar, Mark Peters, Donald Ignasiak, Deborah Dukatz, John Hefferon