Patents by Inventor William R. Trudell

William R. Trudell 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).

  • Lifter for valve-boxes
    Patent number: 4220366
    Abstract: There is disclosed a lifting device for removing valve-boxes and sections thereof wherein a pair of pivoted, opposed side frames are pivoted about a pair of linking bars to securely grip the valve-box. The lifting device further includes a pair of adjustable locking hinges to provide more tension for a more secure grip about the valve-box, whereby the valve-box can subsequently be removed from the ground in which it was previously implanted.
    Type: Grant
    Filed: April 20, 1979
    Date of Patent: September 2, 1980
    Inventor: William R. Trudell