Patents by Inventor Roelof Voerman

Roelof Voerman 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).

  • Identification mark comprising an optically and electronically readable marking
    Patent number: 6609728
    Abstract: Authenticity/security identification consists of an optical marking and an (acoustic/electro)magnetic marking. The optical marking can comprise a hologram. The two identification marks are produced as a single entity during the production in a number of immediately successive steps. During this process a layer of soft magnetic material is provided with an additional layer of metal which contains the hologram.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: August 26, 2003
    Assignee: Security Graphics B.V.
    Inventors: Roelof Voerman, Bob Snoeck