Patents by Inventor Roland Sonntag

Roland Sonntag 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).

  • Holder for lead refills
    Patent number: D342088
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: December 7, 1993
    Assignee: J. S. Staedtler GmbH & Co.
    Inventors: Roland Sonntag, Christian Leibeck