Patents by Inventor Mario Pregnolato

Mario Pregnolato 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 for filling an electrical device for medium and high voltage applications
    Patent number: 6213165
    Abstract: A method for filling an electrical device with a multi-component insulating filler, including the steps of: mixing at least two components of insulating filler each with compressible microspheres; measuring at regular intervals a viscosity of each of the at least two components of insulating filler mixed with the microspheres until each of the at least two components of insulating filler have a substantially uniform viscosity; mixing the at least two components of insulating filler together in order to obtain a multi-component insulating filler; extracting air present in a free volume V of the electrical device using a vacuum pump; filling the free volume V of the electrical device with the multi-component insulating filler until the free volume V of the electrical device is completely filled; and injecting an additional amount of the multi-component insulating filler in order to develop overpressure.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: April 10, 2001
    Assignee: ABB Research Ltd.
    Inventors: Cesare Guida, Manuela Signorelli, Mario Pregnolato, Andrea Catenacci