Patents by Inventor Stefano Preda

Stefano Preda 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).

  • Method and equipment for producing solid granules of pitch in the form of cylinders crushed at the ends
    Patent number: 4482517
    Abstract: The pitch is extruded at a suitable temperature through cylindrical nozzles. At the exit from these nozzles the pitch is lowered into water, where a cutter divides it into granules which, deposited on a conveyer belt, remain immersed long enough to permit suitable cooling. Then they undergo drying by hot jets of air.
    Type: Grant
    Filed: June 18, 1982
    Date of Patent: November 13, 1984
    Assignee: Carbochimica Italiana S.p.A.
    Inventors: Valentino Petrini, Stefano Preda
  • Stirrer-mixer for retorts in particular, wherein the insuffation is carried out through the stirrer itself
    Patent number: 4480924
    Abstract: To stir up and mix the substances held inside a retort, a blade is used, of a shape corresponding to that of the retort itself. Inside the blade there is a conduit, connected to outer devices for the admission of gas, and provided with a series of apertures, directed towards the inner part of the retort, for the discharge of the gas.
    Type: Grant
    Filed: May 13, 1983
    Date of Patent: November 6, 1984
    Inventor: Stefano Preda