Patents by Inventor Robert Michael Graven

Robert Michael Graven 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).

  • Coloringbook, a solid state display device
    Patent number: 3932862
    Abstract: A two-dimensional matrix of semiconductors is arranged in ordered array as a flat, light emitting and light sensing device for input and read-out of information from a computer. A penlight is used to activate the light sensing semiconductors to achieve a graphical input. Operation of the device can be either incremental or random.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: January 13, 1976
    Inventor: Robert Michael Graven