Patents by Inventor Friedrich Grothkopp

Friedrich Grothkopp 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).

  • Patent number: D247743
    Type: Grant
    Filed: April 6, 1976
    Date of Patent: April 18, 1978
    Assignee: C. Plath
    Inventors: Gerd Finnern, Mario Fleig, Friedrich Grothkopp, Peter Hein, Armin Rahn, Lorenz Schneider