Patents by Inventor Ragnar Tronstrad

Ragnar Tronstrad 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).

  • Calcium-silicate based slag for treatment of molten silicon
    Patent number: 7879130
    Abstract: The present invention relates to a calcium-silicate based slag having a phosphorous content of less than 3 ppmw. The invention further relates to a method for producing a low phosphorous calcium-silicate based slag, where molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel, whereby phosphorous in the calcium-silicate based slag is transferred to the ferrosilicon alloy, and a low phosphorous calcium-silicate to based slag is removed from the vessel.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: February 1, 2011
    Assignee: Elkem ASA
    Inventors: Erik Enebakk, Gabriella Maria Tranell, Ragnar Tronstrad