Patents by Inventor Charles Knibbler

Charles Knibbler 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).

  • Mobile radiotelephone with handsfree device
    Patent number: 5835607
    Abstract: A mobile radio transceiver comprising a hands-free facility, which hands-free facility combines at least two acoustic input signals to produce an output signal, and an adaptive filter is provided for filtering the combined output signal. To achieve an improved speech quality, a high-pass filter is provided for filtering the acoustic input signals.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: November 10, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Rainer Martin, Kees Janse, Charles Knibbler, Walter Kellermann