Patents by Inventor Michael Peterat

Michael Peterat 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).

  • Process for removing impurities from silicon fragments
    Patent number: 4525336
    Abstract: A process for the removal of carbon- and iron-containing impurities from icon fragments which result when polycrystalline formed silicon bodies produced by vapor phase deposition undergo a crushing treatment. The removal is effected by several steps comprising nitrate treatment, annealing, acid and magnetic treatment, leaving the treated fragments in a state of highest purity that makes them particularly useful in the crucible-pulling process of Czochralski.
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: June 25, 1985
    Assignee: Wacker-Chemitronic Gesellschaft fur Elektronik Grundstoffe m.b.H.
    Inventors: Rudolf Griesshammer, Michael Peterat