Patents by Inventor John A. Pretto

John A. Pretto 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).

  • Hybrid composite expandable shaft
    Patent number: 5746387
    Abstract: An expandable shaft of the slotted type made of metal and a fiber and resin composite material. The shaft is formed of an elongated shell having hollow portions filled with a fiber/resin material.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: May 5, 1998
    Inventors: Alessio G. Pretto, John A. Pretto