Patents by Inventor D. B Keele, Jr.

D. B Keele, Jr. 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).

  • Acoustic lens system
    Patent number: 7316290
    Abstract: A loudspeaker includes a frame, a magnet coupled to the frame and a diaphragm secured to the frame. An acoustic lens may be positioned in front of the diaphragm. An aperture extends through the acoustic lens. The acoustical directivity pattern of the loudspeaker may be modified by the acoustic lens to improve the uniformity of the off axis vs. on axis sound pressure level.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: January 8, 2008
    Assignee: Harman International Industries, Incorporated
    Inventors: Steven W Hutt, John F Steere, D. B Keele, Jr.