Patents by Inventor Charles H. Sarver

Charles H. Sarver 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).

  • DC voltage/current heating/gelling/curing of resin encapsulated distribution transformer coils
    Patent number: 6624734
    Abstract: An internal heating method for drying, gelling and final curing of epoxy resin insulation systems used for encapsulating dry type cast distribution transformer coils is disclosed. The internal method uses a Direct-Current (DC) power source to control and supply DC current to resistively heat the transformer coil encapsulated with a liquid resin under vacuum in a mold. DC current is applied to a given coil based on its conductor cross-sectional area and its epoxy resin quantity to achieve a specified temperature for drying, gelling and final curing. The temperature, controlled by DC resistive heating is maintained for a given period for each step.
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: September 23, 2003
    Assignee: ABB Technology AG
    Inventors: Thomas J. Lanoue, Charles H. Sarver, Harold Younger, Rush B. Horton, Jr., Michael D. White, Paul Szász
  • DC voltage/current heating/gelling/curing of resin encapsulated distribution transformer coils
    Publication number: 20030058076
    Abstract: An internal heating method for drying, gelling and final curing of epoxy resin insulation systems used for encapsulating dry type cast distribution transformer coils is disclosed. The internal method uses a Direct-Current (DC) power source to control and supply DC current to resistively heat the transformer coil encapsulated with a liquid resin under vacuum in a mold. DC current is applied to a given coil based on its conductor cross-sectional area and its epoxy resin quantity to achieve a specified temperature for drying, gelling and final curing. The temperature, controlled by DC resistive heating is maintained for a given period for each step.
    Type: Application
    Filed: September 21, 2001
    Publication date: March 27, 2003
    Inventors: Thomas J. Lanoue, Charles H. Sarver, Harold Younger, Rush B. Horton, Michael D. White