Patents by Inventor David F. McCallum

David F. McCallum 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).

  • Patent number: 4129315
    Abstract: A plurality of wheels are rotatably mounted on the surface of a plate type member in a manner whereby the member is movable on different types of terrain. The member supports a rider on its top surface.
    Type: Grant
    Filed: April 15, 1977
    Date of Patent: December 12, 1978
    Inventor: David F. McCallum
  • Patent number: 4126116
    Abstract: A frame consisting of four panels with perforations in the lower portions of each of the panels can be hingedly connected together with long posts which can be driven into the ground after passing through the panel hinges to secure the frame to the ground, a pair of grill sections connected by loops can then be placed over the panels for barbecuing, by removal of one of the posts the frame may be disassembled and then the grill sections can be folded around the panels whereupon a handle can be secured to the tops of the grill sections to carry the disassembled portable barbecue device.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: November 21, 1978
    Inventor: David F. McCallum
  • Patent number: 4063382
    Abstract: A circular hollow ring of circular cross-section which may be tossed in the air. Three airfoil-shaped fins are each mounted equidistantly about the inner circumference of the ring to provide aerodynamic properties to the ring when it is tossed in a manner, causing the ring to rotate in the air.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: December 20, 1977
    Assignee: The Raymond Lee Organization, Inc.
    Inventor: David F. McCallum