Patents by Inventor Derek W. Ball

Derek W. Ball 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: 4034493
    Abstract: A display device consisting of a sealed chamber defined by two closely spaced panes or plates of a transparent or translucent material. Liquids of different specific gravities and selected viscosities are located in the chamber. In operation, the device is inverted and the liquid of the heavier specific gravity flows through the liquid of the lighter specific gravity in distinct, spaced apart beads or droplets under the influence of gravity. The downward flow of the heavier liquid causes the upward displacement of the lighter liquid. A series of obstructions of various shapes and geometric configurations are interposed in the flow path of the heavier liquid to change its flow path and create the visual display.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: July 12, 1977
    Assignee: Wham-O Mfg. Co.
    Inventor: Derek W. Ball