Patents by Inventor Daniel T. Callari

Daniel T. Callari 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).

  • Magnet actuated floating rung novelty ladder
    Patent number: 4938728
    Abstract: The present invention relates to an improved novelty device resembling a ladder. The device includes a base having rung guides located thereon. Spaced between the rung guides and above the base are a plurality of rungs having magnets located in the ends of each rung. The magnets and rung guides are arranged such that the rungs may freely travel between the rung guides, the rungs being separated by the repulsive forces of the magnets.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: July 3, 1990
    Inventor: Daniel T. Callari