Patents by Inventor John C. Calvert

John C. Calvert 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).

  • Dome-shaped structure
    Patent number: 5140790
    Abstract: A dome shaped structure, and the method of constructing it, are described using curved gore-shaped construction panels which have grooves in their side edges. Rectangular tubular joining members are placed in the grooves, secured therein, and serve to join adjacent panels together. This provides a level surface where the panels are joined so that such adjacent edges of joined panels are even making the interior surface suitable for use as a projection surface.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: August 25, 1992
    Assignee: Nordam
    Inventors: Rodger L. Modglin, John C. Calvert