Patents by Inventor John David Jeffery

John David Jeffery 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).

  • Variable duration valve system
    Patent number: 10371024
    Abstract: A valve assembly selectively varies the timing of the valves in an internal combustion engine cycle by way of a first and second camshaft. Each valve has a shuttle portion and a valve portion. Upper and lower cam followers on the shuttle portion engage with first and second cams on each of the first and second camshafts to move the valve between an open and closed position with reference to a valve seat on an engine block.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: August 6, 2019
    Assignee: 2575168 ONTARIO INC.
    Inventor: John David Jeffery
  • VARIABLE DURATION VALVE SYSTEM
    Publication number: 20180363520
    Abstract: A valve assembly selectively varies the timing of the valves in an internal combustion engine cycle by way of a first and second camshaft. Each valve has a shuttle portion and a valve portion. Upper and lower cam followers on the shuttle portion engage with first and second cams on each of the first and second camshafts to move the valve between an open and closed position with reference to a valve seat on an engine block.
    Type: Application
    Filed: December 9, 2016
    Publication date: December 20, 2018
    Inventor: John David Jeffery