Patents by Inventor Douglas E. Harding

Douglas E. Harding 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).

  • Visual aid and display device
    Patent number: 4156975
    Abstract: A visual aid and display device is disclosed in which a central axis has mounted thereon a nest of vanes of varying length which are sheet-like members longer in length than width and concaved toward the central axis and each of which is connected to the axis at both of its ends. The vanes may be any of a number of geometrical shapes and may carry a limitless variety of visual displays on their surfaces.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: June 5, 1979
    Inventor: Douglas E. Harding