Patents by Inventor William R. Ifield

William R. Ifield 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).

  • Hydraulic actuator
    Patent number: RE29000
    Abstract: A hydraulic actuator for producing translational movement over a long distance having two jack cylinders with pistons mounted for reciprocal movement and connected to a worm wheel through a worm gear. When a piston is driving, the worm gear acts as a rack to turn the worm wheel and when a piston is being returned to its starting position the worm gear rotates. Means are provided to alternately switch from one cylinder to the other.
    Type: Grant
    Filed: March 21, 1974
    Date of Patent: October 12, 1976
    Assignee: R. J. Ifield & Sons Pty. Limited
    Inventors: Richard J. Ifield, William R. Ifield