Patents Assigned to Louis Liang
  • System for authenticating printed or reproduced documents
    Patent number: 5714291
    Abstract: An improved laser printer or photocopier toner for authentication is made by mixing conventional toner particles with submicron ultraviolet sensitive particles that exhibit detectable characteristics in response to ultraviolet radiation. A document printed using the improved toner can be authenticated using a UV scanner.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: February 3, 1998
    Assignees: Daniel Marinello, Louis Liang, Angstrom Technologies
    Inventors: Daniel Marinello, Louis Liang, William G. McGinness