Patents by Inventor Robert E. Donham

Robert E. Donham 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).

  • Wind turbine
    Patent number: 4297076
    Abstract: An improved wind turbine in which the tip portions of the blades are variable in pitch and are cyclically varied in pitch to control the yaw of the rotor and to relieve bending moments on the blades and are collectively varied in pitch to relieve bending moments on the blades and to maximize the power output of the turbine at a selected constant rotor speed.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: October 27, 1981
    Assignee: Lockheed Corporation
    Inventors: Robert E. Donham, Richard L. Heimbold