Patents by Inventor Jim Helfenstein

Jim Helfenstein 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).

  • Manually operated air valve and actuator in combination control a hydraulic spool valve for maneuvering heavy equipment
    Patent number: 4926905
    Abstract: A proportional remote control having an air regulating controller and an air operated actuator that have matched components to provide a true linear control of the displacement of a valve spool in proportion to lever displacement on the controller. Minimal displacement of the hand lever applies an initial stepped output pressure to the actuator which moves the spool just short of fluid flow. The controller regulates the air pressure applied to the actuator from the initial stepped pressure to its maximum output in proportion to the displacement of its control lever.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: May 22, 1990
    Assignee: Williams Controls, Inc.
    Inventor: Jim Helfenstein