Patents by Inventor John Marshall II, deceased

John Marshall II, deceased 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).

  • Helicopter with stabilator detuned in antisymmetric vibration modes from main rotor wake excitation frequency
    Patent number: 4247061
    Abstract: A helicopter stabilator having naturally high response to the main rotor wake excitation frequency in roll and yaw stabilator vibratory modes is selectively mounted so as to be detuned therefrom in antisymmetric stabilator vibratory modes without adversely affecting symmetric stabilator vibratory modes, stabilator vertical stiffness, or stabilator pitch stiffness.
    Type: Grant
    Filed: July 12, 1978
    Date of Patent: January 27, 1981
    Assignee: United Technologies Corporation
    Inventors: William A. Kuczynski, John Marshall, II, deceased
  • Tuned spring-mass vibration absorber
    Patent number: 4230291
    Abstract: A tuned spring-mass vibration absorber in which a dynamic mass is suspended from a vibrating support member, such as a helicopter fuselage, by a plurality of cantilevered leaf springs integrally connected to the dynamic mass at selected stations so that the mass CG and the spring center of force are coincident, so that the springs are shaped to constitute a substantial part of the vibration absorber effective mass, and so that the springs are pivotally connected to the support member so as to impart no moments thereto.
    Type: Grant
    Filed: June 7, 1978
    Date of Patent: October 28, 1980
    Assignee: United Technologies Corporation
    Inventor: John Marshall II, deceased