Patents Assigned to Alagao Aktiengesellschaft
  • Method for protecting against forgery sheet-like printed documents
    Patent number: 5789019
    Abstract: A method for protecting against forgery a printed document comprises the step of applying on the document, during the printing thereof, a microcapsule layer. This layer comprises microcapsules including a chemical product adapted to release an indelible mark which reveals tampering on surfaces portions of a document subjected to a pressing or rubbing tampering force.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: August 4, 1998
    Assignee: Alagao Aktiengesellschaft
    Inventor: Vittorio Vigano