Patents by Inventor Walter von Kempski

Walter von Kempski 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).

  • Security filament as protection against fraud
    Patent number: 4371196
    Abstract: The invention relates to a security filament to protect against forgery of bank notes, securities, permit cards, identity cards and passports, whereby the safety thread has a cross-sectional shape by which it can be identified optically and is provided with structural features on its surface which extend invariably over the length of the thread.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: February 1, 1983
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Walter von Kempski, Fritz Kirstein