Patents by Inventor Halvard Tveit

Halvard Tveit 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 production of white microsilica
    Patent number: 6696035
    Abstract: The present invention relates to a method for producing microsilica having a reflectivity between 65 and 90% in a smelting furnace for production of ferrosilicon or silicon by using a charge comprising an SiO2 source and a solid carbonaceous reduction agent, where microsilica is recovered from the off-gases from the smelting furnace, wherein the solid reduction agent supplied to the furnace contains an amount of volatile matters of less than 1.25 kg per kg produced microsilica and that the temperature in the gas atmosphere in the furnace above the charge is kept above 500° C.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: February 24, 2004
    Assignee: Elkem ASA
    Inventors: Magne Dastol, Halvard Tveit, Eldar Dingsoyr, Per Ronning, Svein Harsaker
  • Method for production of white microsilica
    Publication number: 20020025287
    Abstract: The present invention relates to a method for producing microsilica having a reflectivity between 65 and 90% in a smelting furnace for production of ferrosilicon or silicon by using a charge comprising an SiO2 source and a solid carbonaceous reduction agent, where microsilica is recovered from the off-gases from the smelting furnace, wherein the solid reduction agent supplied to the furnace contains an amount of volatile matters of less than 1.25 kg per kg produced microsilica and that the temperature in the gas atmosphere in the furnace above the charge is kept above 500° C.
    Type: Application
    Filed: July 3, 2001
    Publication date: February 28, 2002
    Inventors: Magne Dastol, Halvard Tveit, Eldar Dingsoyer, Per Ronning, Svein Harsaker
  • Method for weighing electrodes in electric smelting furnaces
    Patent number: 6330270
    Abstract: The present invention relates to a method for weighing an electrode submerged in the charge of an electric smelting furnace. The electrode is moved in vertical direction at least once, whereafter the electrode is lifted and the weight of the electrode is registered shortly after the electrode has been lifted.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: December 11, 2001
    Assignee: Elkem ASA
    Inventors: Georg Brustad, Frode Haugen, Halvard Tveit, Aasgeir Valderhaug