Patents Assigned to Lean B.V.
  • Method for protecting a paper security document or identification document
    Patent number: 6395191
    Abstract: In order to protect a paper-thin valuable document or identification document on which an identification mark has been placed, for example by means of a printing technique or by a laser technique, in such a way that counterfeiting is extremely difficult, at least part of said identification mark is repeated at another point by changing the thickness of the document locally. At least part of the identification mark is thus clearly liked to the paper substrate.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: May 28, 2002
    Assignee: Lean B.V.
    Inventor: Karel Johan Schell