Patents by Inventor Don K. Shackelford

Don K. Shackelford 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).

  • Drop tube assembly with shut-off valve and method for assembling the same
    Patent number: 5235999
    Abstract: A tank filling drop tube assembly (2, 48) includes a drop tube (16, 50) and a linear motion shut-off valve assembly (24). One embodiment includes a barrier (30) which seals the interior of the drop tube. Outlet ports (32) are formed through the drop tube above the barrier. A restrictor sleeve (26, 58) is mounted around the outside of the drop tube just below the outlet ports. The restrictor sleeve is connected to a float (36) at the upper end (10) of the drop tube. When the tank (4) is substantially filled, the float lifts the restrictor sleeve to seal the outlet ports to help prevent overfilling of the tank.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: August 17, 1993
    Assignee: Guillotine, Inc.
    Inventors: Thomas R. Lindquist, Don K. Shackelford