Patents by Inventor Pier L. Castelli

Pier L. Castelli 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 hub
    Patent number: 4521157
    Abstract: A helicopter rotor hub having a lobed shape defining a plurality of bridge structures each allowing the attachment of a respective blade; each bridge structure is formed of superimposed sections of three annular bands, of synthetic material, the intermediate one of which forms an outer frame extending around the whole of the periphery of the hub, while the other two define one of the said lobes and connect the said outer frame to an inner metal structure.
    Type: Grant
    Filed: March 2, 1983
    Date of Patent: June 4, 1985
    Assignee: Costruzioni Aeronautiche Giovanni Agusta S.p.A.
    Inventors: Vittorio Caramaschi, Pier L. Castelli