Patents by Inventor Franz Durrer

Franz Durrer 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).

  • Banknote invalidating machine
    Patent number: 4061436
    Abstract: A banknote invalidating machine comprises an interchangeable plate for receiving a pile of banknotes of given format, a press which compresses the pile of notes, and a perforating tool which is moved by a sequential control to perforate the compressed pile of notes at given locations.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: December 6, 1977
    Assignee: Compagnie Industrielle Radioelectrique
    Inventor: Franz Durrer