Patents by Inventor Douglas Andrew Marchant

Douglas Andrew Marchant 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).

  • Bending wave acoustic device and method of making thereof
    Patent number: 8391540
    Abstract: An acoustic device and method of making said acoustic device. The acoustic device comprises a diaphragm having resonant bending wave modes in the operating frequency range, and a plurality of electromechanical transducers coupled to the diaphragm. The positioning and mechanical impedance of the transducers are such that at least a selected number of the resonant bending wave modes are balanced so that the net transverse modal velocity over the area of the diaphragm tends to zero with the balancing of the resonant bending wave modes being achieved substantially by the positioning and mechanical impedance of the transducers. The parameters of the diaphragm may be such that there are a plurality of nodal grouped locations at or around which the nodal lines of a selected number of resonant modes are clustered. Each transducer may be mounted at one of the plurality of nodal grouped locations.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: March 5, 2013
    Assignee: New Transducers Limited
    Inventors: David Keith Berriman, Christien Ellis, Martin Colloms, Graham Bank, Neil John Harris, Douglas Andrew Marchant
  • Bending Wave Acoustic Device and Method of Making Thereof
    Publication number: 20090290732
    Abstract: An acoustic device and method of making said acoustic device. The acoustic device comprises a diaphragm having resonant bending wave modes in the operating frequency range, and a plurality of electromechanical transducers coupled to the diaphragm. The positioning and mechanical impedance of the transducers are such that at least a selected number of the resonant bending wave modes are balanced so that the net transverse modal velocity over the area of the diaphragm tends to zero with the balancing of the resonant bending wave modes being achieved substantially by the positioning and mechanical impedance of the transducers. The parameters of the diaphragm may be such that there are a plurality of nodal grouped locations at or around which the nodal lines of a selected number of resonant modes are clustered. Each transducer may be mounted at one of the plurality of nodal grouped locations.
    Type: Application
    Filed: January 18, 2007
    Publication date: November 26, 2009
    Inventors: Keith David Berriman, Christien Ellis, Martin Colloms, Graham Bank, John Neil Harris, Douglas Andrew Marchant