Patents by Inventor Joao A. D. Cullen

Joao A. D. Cullen 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).

  • Two-piece piston and method of manufacturing the same
    Patent number: 5065508
    Abstract: A method for the manufacture of a two-piece piston wherein the top portion and the pin boss portion, which define the piston head, are fabricated separately by cold or hot forming, casting or sintering, and joined together by welding such as, for instance, friction welding. The top portion and the pin boss portion may be of the same material or different materials, and obtained by the same method or by different methods.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: November 19, 1991
    Assignee: Metal Leve S.A. Industria e Comercio
    Inventors: Gustavo F. Lorento, Jose A. C. Mendes, Joao A. D. Cullen