Patents by Inventor James E. Risser

James E. Risser 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).

  • Hovering aircraft
    Patent number: 5931411
    Abstract: In a novel hovering aircraft, an airfoil blade structure rotatable about a vertical axis comprises a set of upper blades and a set of lower blades, all having variable lift, the upper blades converging toward the lower blades from root to tip. Struts, located inboard of the blade tips, keep the tips of the upper and lower blades separate from each other to reduce interference effects, and also support motors and propellers.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: August 3, 1999
    Assignee: Aereon Corporation
    Inventors: James E. Risser, William F. Putman