Patents by Inventor Allan W. Lindberg

Allan W. Lindberg 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).

  • Illuminated changeable-display sign
    Patent number: 4286263
    Abstract: An illuminated changeable-display sign has lamps which are visible to viewers and which are arranged in rows and columns, has light emitting diodes which are visible to the operator of that sign and which are arranged in corresponding rows and columns, and has control circuitry which enables the data displayed by the LEDS to be exactly the same as or different from the data displayed by the lamps.
    Type: Grant
    Filed: August 16, 1979
    Date of Patent: August 25, 1981
    Inventor: Allan W. Lindberg