Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2007-08-02
2008-05-13
Lee, Seung Ho (Department: 2887)
Registers
Coded record sensors
Particular sensor structure
C235S462450, C235S472010
Reexamination Certificate
active
07370798
ABSTRACT:
A security mark having multiple optically orthogonal coaligned bar codes is produced using a reflection hologram visible substantially at only a first wavelength that is layered over a wavelength sensitive filter, which blocks light transmission at the first wavelength but transmits light at a second wavelength, and having beneath it an additional bar code visible through the hologram and the wavelength sensitive filter at the second wavelength. A validation means reads multiple holographic bar codes with light at the first wavelength by illuminating the hologram separately from multiple directions, and further reads the bar code beneath the wavelength sensitive filter by illuminating the mark with light of the second wavelength. By suitable choice of multi-directional and multi-wavelength illumination, multiple coaligned bar codes may be read in the same physical location with no mutual interference.
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Diller Ramik & Wight
Ho Lee Seung
IDX, Inc.
Taylor April A.
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