Patents by Inventor Piero Lavezzari

Piero Lavezzari 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).

  • Patent number: 4129466
    Abstract: A process and apparatus for forming the stranded conductor portion of a fully-filled electric cable in which the components of the strand in side-by-side relation are fed through an inlet die at one end of a chamber in which a filling medium at a temperature at least 5.degree. C above the dropping point temperature of the medium and under a pressure above atmospheric pressure is circulated in a direction opposite to the conductor feed direction. In the chamber, the components, preferably groups of conductors, are spread apart by a perforated disc through which they pass and are then twisted together at an outlet die at the opposite end of the chamber to form a strand with a coating of the medium and with the medium filling the spaces between components. From the outlet die the strand passes directly into a bath of the medium in a temperature controlled tank at atmospheric pressure but which maintains the medium at least 5.degree. C above its dropping point temperature.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: December 12, 1978
    Assignee: Industrie Pirelli Societa per Azioni
    Inventors: Antonio Portinari, Piero Lavezzari
  • Patent number: 4105485
    Abstract: Apparatus for forming the stranded conductor portion of a fully-filled electric cable in which the components of the strand in side-by-side relation are fed through an inlet die at one end of a chamber in which a filling medium at a temperature at least 5.degree. C. above the dropping point temperature of the medium and under a pressure above atmospheric pressure is circulated in a direction opposite to the conductor feed direction. In the chamber, the components, preferably groups of conductors, are spread apart by a perforated disc through which they pass and are then twisted together at an outlet die at the opposite end of the chamber to form a strand with a coating of the medium and with the medium filling the spaces between components. From the outlet die the strand passes directly into a bath of the medium in a temperature controlled tank at atmospheric pressure but which maintains the medium at least 5.degree. C. above its dropping point temperature.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: August 8, 1978
    Assignee: Industrie Pirelli Societa per Azioni
    Inventors: Antonio Portinari, Piero Lavezzari