Patents by Inventor Frank J. Roberts

Frank J. Roberts 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).

  • Airfoil assembly
    Patent number: 6893223
    Abstract: An airfoil assembly having a blade with a leading edge, a trailing edge, a root and a tip. The assembly rotates about a first axis. The blade has a planar windward surface parallel to a second axis which is orthogonal to the first axis. A third axis orthogonal with the first and second axes defines the general orientation of the blade viewed along the first axis; however, the blade is pitched at an angle relative to the third axis. The convex leading edge, convex tip, and concave trailing edge have similar radii, and the leading and trailing edges converge as they approach the tip.
    Type: Grant
    Filed: October 3, 2002
    Date of Patent: May 17, 2005
    Inventor: Frank J. Roberts
  • Airfoil assembly
    Publication number: 20040067136
    Abstract: An airfoil assembly having a blade with a leading edge, a trailing edge, a root and a tip. The assembly rotates about a first axis. The blade has a planar windward surface parallel to a second axis which is orthogonal to the first axis. A third axis orthogonal with the first and second axes defines the general orientation of the blade viewed along the first axis; however, the blade is pitched at an angle relative to the third axis. The convex leading edge, convex tip, and concave trailing edge have similar radii, and the leading and trailing edges converge as they approach the tip.
    Type: Application
    Filed: October 3, 2002
    Publication date: April 8, 2004
    Inventor: Frank J. Roberts