Patents by Inventor Siegfried Schmieder

Siegfried Schmieder 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).

  • Production of valve metal powders
    Patent number: 8951328
    Abstract: The invention relates to the production of valve metal powders, in particular, tantalum powders by reduction of a corresponding valve metal compound, for example, K2TaF7, with an alkali metal in the presence of a diluent salt, whereby the reduction is carried out in the presence of a particle diminution agent, preferably, Na2SO4, which is added to the reaction mixture continuously or in aliquots.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: February 10, 2015
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Frank Behrens, Siegfried Schmieder