1
Donald W Mallik: Holograms with discontinuous metallization including alpha-numeric shapes. American Banknote Holographics, Majestic Parsons Siebert & Hsue, August 25, 1992: US05142383 (160 worldwide citation)

Non-continuous reflective hologram or diffraction grating devices are provided in various forms for authenticating documents and things, such as those that contain visual information desired to be protected from alteration. Examples of such information include written personal data and photograph on ...


2
Donald W Mallik: Holograms with discontinuous metallization including alpha-numeric shapes. American Bank Note Holographics, Majestic Parsons Siebert & Hsue, September 3, 1991: US05044707 (56 worldwide citation)

Non-continuous reflective hologram or diffraction grating devices are provided in various forms for authenticating documents and things, such as those that contain visual information desired to be protected from alteration. Examples of such information include written personal data and photograph on ...



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