Patents Assigned to Lipatec Etablissement
  • Method of rendering a document or portion of it resistant to photocopying
    Patent number: 5087507
    Abstract: An article with at least a portion carrying symbols representing information to be protected against photocopying is formed by a carrier, a continuous layer covering the portion of the carrier and forming a background thereon, and a mainly discontinuous layer applied on the continuous layer and forming the symbols against the background. One of the layers is an iridescent layer of a color that copies dark and the other of the layers has a dark color. Thus photocopying gives an image without distinction between the symbols and the background.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: February 11, 1992
    Assignee: Lipatec Etablissement
    Inventor: Paul Heinzer