Patents by Inventor John G. Leishman

John G. Leishman 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).

  • Rotor blade system with reduced blade-vortex interaction noise
    Patent number: 6948906
    Abstract: A rotor blade system with reduced blade-vortex interaction noise includes a plurality of tube members embedded in proximity to a tip of each rotor blade. The inlets of the tube members are arrayed at the leading edge of the blade slightly above the chord plane, while the outlets are arrayed at the blade tip face. Such a design rapidly diffuses the vorticity contained within the concentrated tip vortex because of enhanced flow mixing in the inner core, which prevents the development of a laminar core region.
    Type: Grant
    Filed: July 15, 2003
    Date of Patent: September 27, 2005
    Assignee: University of Maryland
    Inventors: John G. Leishman, Yong Oun Han
  • Rotor blade system with reduced blade-vortex interaction noise
    Publication number: 20040197194
    Abstract: A rotor blade system with reduced blade-vortex interaction noise includes a plurality of tube members embedded in proximity to a tip of each rotor blade. The inlets of the tube members are arrayed at the leading edge of the blade slightly above the chord plane, while the outlets are arrayed at the blade tip face. Such a design rapidly diffuses the vorticity contained within the concentrated tip vortex because of enhanced flow mixing in the inner core, which prevents the development of a laminar core region.
    Type: Application
    Filed: July 15, 2003
    Publication date: October 7, 2004
    Inventors: John G. Leishman, Yong Oun Han