Patents by Inventor Andrew W. Vanderberg

Andrew W. Vanderberg 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).

  • Controlled lift gate system for milking parlors
    Patent number: 4879971
    Abstract: Controlled vertically swinging exit gates for milking parlor stalls having resilient control devices for lowering the gates in a smooth and controlled manner and to stop jerking downward or upward movement of the gate upon opening and closing, comprising two horizontally movable pulleys fastened to a draw-bar which actuates opposing cables to smoothly control operation of the gates.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: November 14, 1989
    Inventors: August Vandenberg, Ben W. Vandenberg, Andrew W. Vanderberg, Ben E. Haws