Patents by Inventor John R. Ewans

John R. Ewans 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).

  • Reverse velocity rotor system for rotorcraft
    Patent number: 4227856
    Abstract: A blade control method and means for helicopter rotors which increases heopter speed by mixing two/rev. control motion with one/rev. cyclic and collective motion through mechanical summation is provided. Both rotary and vertical motions are imparted to an inner control shaft and these motions are combined to impart vertical oscillatory motions to the rotor head which motions increase the thrust developed by the helicopter rotor.
    Type: Grant
    Filed: July 12, 1978
    Date of Patent: October 14, 1980
    Assignee: The United States of Ameria as represented by the Secretary of the Navy
    Inventors: Thomas D. Verrill, John R. Ewans