Patents by Inventor Federico Zardi

Federico Zardi 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).

  • Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature
    Patent number: 6175040
    Abstract: A reactor for two-phase reaction, in particular for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprises a substantially cylindrical vertical external shell (2) in which is supported a plurality of superimposed horizontal perforated plates (6a-6e) in mutually spaced relationship and at least one opening (12a-12e) for liquid flow being defined in correspondence of each of the perforated plates. Advantageously the openings (12a-12e) for liquid flow are mutually offset so as to obtain a substantially zigzag preferential flow path for the liquid phase in the reactor.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: January 16, 2001
    Assignee: Urea Casale SA
    Inventors: Federico Zardi, Paolo Silva
  • Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature
    Patent number: 6120740
    Abstract: A reactor for two-phase reaction, in particular for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprises a substantially cylindrical vertical external shell (2) in which is supported a plurality of superimposed horizontal perforated plates (6a-6e) in mutually spaced relationship and at least one opening (12a-12e) for liquid flow being defined in correspondence of each of the perforated plates. Advantageously the openings (12a-12e) for liquid flow are mutually offset so as to obtain a substantially zigzag preferential flow path for the liquid phase in the reactor.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: September 19, 2000
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Paolo Silva
  • Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature
    Patent number: 5888460
    Abstract: An in-situ modernization method is provided for a reactor of the type having a plurality of spaced apart perforated plates disposed within a hollow cylindrical vessel wherein the plates are perforated and spaced from the vessel wall to define an annular gap between the periphery of each plate and the vessel wall. The method includes the steps of providing a substantially annular baffle to substantially close the gap while leaving an opening with the openings of adjacent plates being diametrically opposed to each other. Alternatively, the annular gap may be substantially closed by an annular baffle and an enlarged opening is provided in each plate with the openings of adjacent plates being diametrically opposed to each other.
    Type: Grant
    Filed: July 18, 1995
    Date of Patent: March 30, 1999
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Paolo Silva