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US 5,142,383 AGranted
Holograms with discontinuous metallization including alpha-numeric shapes
AssigneeAmerican Banknote Holographics, Inc.
InventorDonald W. Mallik
Life of this patent
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AssigneeAmerican Banknote Holographics, Inc.
InventorDonald W. Mallik
Estimating the term…
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 a passport, driver's license, identity card, transportation pass, and the like. The reflective discontinuous hologram or diffraction device is formed in a pattern that both permits viewing the protected information through it and the viewing of an authenticating image or other light pattern reconstructed from it in reflection. The same master hologram or diffraction grating is made into distinct authenticaton devices by forming replicas thereof that have different patterns of reflective material which form distinct indicia, such as a different alpha-numeric character.
At least first and second documents having visual information thereon protected from alteration, comprising:
At least first and second hologram or light diffraction devices formed from replicas of a light interference pattern recorded as a common surface relief pattern on one side of a substantially transparent sheet, wherein said first device includes a pattern of discontinuous substantially opaque reflective material conforming to a first replica of said common surface relief pattern and arranged to include a first indicia, and wherein said second device includes a pattern of discontinuous substantially opaque reflective material conforming to a second replica of said common surface relief pattern and arranged to include a second indicia visually distinct from the first indicia, whereby said first and second devices can be efficiently made from a single surface relief pattern but yet be visually distinct.
A method of making at least two visually distinct hologram or diffraction devices from a common surface relief master pattern, comprising the steps of:
Dependencies are inferred from the claim text.