Security paper, security documents made from the security paper, and processes for making the security paper, are provided. A groove is formed in paper and a security element is positioned or bonded within the groove. A coating is applied over the security element so that the coating covers at least...http://www.google.fr/patents/US5944927?utm_source=gb-gplus-shareBrevet US5944927 - Security paper having an embedded security thread and a process for making the security paper
Security paper having an embedded security thread and a process for making ...
