Patents by Inventor Giovanni Cefis

Giovanni Cefis 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).

  • Submerged pump with coaxial opposing pistons, driven by double lobed camshaft
    Patent number: 5769616
    Abstract: The submerged pump according to the present invention comprises one or more modular pumping groups, each consisting of a balanced, coaxial and opposing piston couple 7 on spool wheels 10 and with a spring 12 return.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: June 23, 1998
    Inventors: Enzo Mencarelli, Giovanni Cefis