Patents by Inventor Arnold John Sobey

Arnold John Sobey 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 rotor blades
    Patent number: 4077740
    Abstract: A helicopter rotor blade is constructed at least in part of composite material of the type in which fibres (such as glass or carbon fibres) are embedded in a matrix. The stiffness in the flapping plane, the lagging plane, or both are modified at one or more positions along the blade to provide advantageous resonance frequencies. Modification of the stiffness is achieved by diverting a substantial number of fibres inwardly towards the relevant spanwise neutral bending plane.
    Type: Grant
    Filed: August 3, 1976
    Date of Patent: March 7, 1978
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventor: Arnold John Sobey