Patents by Inventor John K. Karpowich

John K. Karpowich 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 tip planform
    Patent number: 7513750
    Abstract: A main rotor blade incorporating a rotor blade tip region having a tip chord and a tip taper such that the ratio of the main rotor blade chord to the tip chord is approximately 0.30. The tip taper ratio preferably providing an approximately 28% area of reduction in said outer 10% of said blade span. The tip region preferably further including a hover optimized high lift airfoil and a tip sweep that reaches a constant value of approximately 30 degrees along the quarter chord line.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: April 7, 2009
    Assignee: Sikorsky Aircraft Corporation
    Inventors: Robert C. Moffitt, Thomas Alan Egolf, Robert D. Beatty, John K. Karpowich, Ashish Bagai