Patents by Inventor Charles D. Caldwell

Charles D. Caldwell 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: 6021432
    Abstract: A broadcast stream contains different types of information with the different types identified in the stream. An information processing device receives the broadcast stream and selectively captures (for future playback) only those pieces of information corresponding to one or more preselected types of information. In one embodiment, the broadcast stream is a radio broadcast and the different types are identified in digital sidebands of the radio signals. In other embodiments, the broadcast stream is embedded into audio signals or video signals using luminance or chrominance modulation or other spread spectrum techniques. A user is able to edit a personal profile that is stored in the device and contains the list of preselected types of information.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: February 1, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Theodore Sizer, II, Katherine G. August, Charles D. Caldwell, Robert F. Henrick