Patents by Inventor Clifford E. Barth

Clifford E. Barth 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: 4276705
    Abstract: A graphical display apparatus having an enclosure with a thin opaque cover made up of an outermost sheet of paper bearing a design, to serve as a display face, and an underlying sheet of aluminum foil backed by an aluminum screen. Incandescent lights are mounted within the enclosure to light its interior. Through the use of pointed markers made of transparent plastic, pinpoints of light can be spotted where desired on the display face for any of various purposes. This is accomplished by pushing the markers through the display face, aluminum foil and aluminum screen at desired locations. The markers are exposed to light in the interior of the enclosure as they pierce the aluminum foil, and therefore show up as points of light on the display face. The incandescent lights in the enclosure emit heat, as a result of which the layer of aluminum foil reacts to bring about a tightening and smoothing of the display face.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: July 7, 1981
    Inventors: William L. Barth, Clifford E. Barth