Patents by Inventor Benjamin D. Oldfield

Benjamin D. Oldfield 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).

  • Phasing device for machine applications
    Patent number: 4601266
    Abstract: An infinitely variable phase adjuster for e.g. adjusting internal combustion piston engine valve timing by selecting the relative rotational positions of the engine crankshaft and a camshaft of the engine. Control is effected by adjusting a "lock" volume of oil on one side of a pressure fluid operable member displaceable to shift the phase.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: July 22, 1986
    Assignee: Renold PLC
    Inventors: Benjamin D. Oldfield, Phillip J. Owen, Colin Hague