Patents Assigned to Francois-Charles Oberthur Group
  • Printing method and copy-evident secure document
    Patent number: 5487567
    Abstract: Disclosed is a method of providing a copy-evident feature to documents and the documents produced thereby. The process allows the printing of a novel security design which is difficult to see with the naked eye when casually inspecting the document, but which will be immediately apparent in a copy if the document is photocopied or transmitted via facsimile.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: January 30, 1996
    Assignee: Francois-Charles Oberthur Group
    Inventor: John R. Volpe