Patents Assigned to Societe Anonyme dite: Arjomari-Prioux
  • Security paper
    Patent number: 4136229
    Abstract: Security paper which immediately reveals an attempt to alter handwriting thereon by the use of an alkaline ink remover and which is characterized by the incorporation therein of a pyrenesulphonic acid or a metal salt thereof, particularly an alkali metal or alkaline earth metal salt.Security paper incorporating such an acid or salt exhibits a fluorescent coloration when contacted with an alkaline ink remover.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: January 23, 1979
    Assignee: Societe Anonyme dite: Arjomari-Prioux
    Inventors: Jean-Yves Godet, Giampaolo Bartoli