Patents by Inventor Gregory Keith Cambrell

Gregory Keith Cambrell 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).

  • Loudspeaker system incorporating acoustic waveguide filters and method of construction
    Patent number: 6223853
    Abstract: A method of constructing an acoustic filter incorporates a technique in which the filter is modelled with one or more distributed two port elements. The or each distributed element is defined by a characteristic impedance and length and includes a waveguide filter which does not require damping. The or each filter section is characterized in that it has at least two resonances which are used to shape a specified response for the filter. A substantially reactive acoustic filter constructed according to the method and a loudspeaker system incorporating such an acoustic filter are also disclosed.
    Type: Grant
    Filed: December 19, 1995
    Date of Patent: May 1, 2001
    Inventors: Graeme John Huon, Gregory Keith Cambrell, Walter Melville Dower