Patents Assigned to Homer, Hollandse Meet- En Regelsystemen B.V.
  • Authenticity mark, document carrying such mark, and process and device for reading and validating such mark
    Patent number: 5018830
    Abstract: Authenticity mark consisting of pattern of randomly divided granules attached to a delimited surface area of a substrate. The granules consist of retroreflective microspheres with a diameter smaller than 500 micron and that the number of microspheres is selected such that between 20% and 80% of the available surface of the delimited area is covered by the microspheres.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: May 28, 1991
    Assignee: Homer, Hollandse Meet- En Regelsystemen B.V.
    Inventor: Hugo K. Krop