Patents by Inventor Raymond Jefferson

Raymond Jefferson 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).

  • Rotary wing aircraft
    Patent number: 4208025
    Abstract: An aircraft rotary wing aerofoil assembly comprising a generally planar annular frame supporting radially inner and outer sets of aerofoil blades, each set being disposed to form an annulus and supported on the frame for rotation about a common axis, and first and second sets of panels are mounted on the frame for movement to shroud portions of the inner and outer sets of aerofoil blades respectively.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: June 17, 1980
    Inventor: Raymond Jefferson