Patents by Inventor Roger L. Marquart

Roger L. Marquart 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 of desulfurization in vacuum processing of steel
    Patent number: 5228902
    Abstract: A method for desulfurizing molten steel while the steel is subjected to a vacuum dehydrogenation treatment, comprising adding to the steel in a vacuum chamber a desulfurizing agent in lump form and comprising, by weight percent, about 50% CaO, about 38% CaF.sub.2, and about 10% MgO.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: July 20, 1993
    Assignee: USX Corporation
    Inventors: Robert S. Bogan, Brad Hjerpe, Roger L. Marquart, James D. Reisinger