Patents by Inventor Earl Russell Geddes

Earl Russell Geddes 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).

  • Waveguide phase plug
    Patent number: 7708112
    Abstract: An improved horn for a compression driver which has an interior foam plug for reducing the amplitude of unwanted non-fundamental wave propagation and better control over the sound radiation pattern of the device.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: May 4, 2010
    Inventor: Earl Russell Geddes
  • Acoustic waveguide for controlled sound radiation
    Patent number: 7068805
    Abstract: Acoustic waveguide contours that approximate either or both of the Elliptic Cylinder and the Prolate Spheroidal coordinate systems that allows for a more accurate prediction and control over the sound radiation polar pattern are disclosed.
    Type: Grant
    Filed: July 11, 2003
    Date of Patent: June 27, 2006
    Inventor: Earl Russell Geddes
  • Transducer motor with low thermal modulation
    Publication number: 20040156525
    Abstract: A composition for a loudspeakers voice coil wire material that reduces the thermal modulation of the motor force factor due to wire resistance changes with temperature.
    Type: Application
    Filed: February 10, 2003
    Publication date: August 12, 2004
    Inventor: Earl Russell Geddes
  • Pulse width modulated controller
    Publication number: 20030108098
    Abstract: A Pulse Width Modulated power amplifier which has a random or pseudo-random comparator switching mechanism for reduced distortion and radiated RF emissions is disclosed.
    Type: Application
    Filed: September 20, 2002
    Publication date: June 12, 2003
    Inventor: Earl Russell Geddes