Patents by Inventor Dirk Kratzer

Dirk Kratzer 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).

  • Accumulator
    Patent number: D626504
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: November 2, 2010
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventors: Alexander Gruve, Elmar Schulze, Dirk Kratzer, Christoph Greger