Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2007-03-20
2007-03-20
Lorengo, J. A. (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031640, C106S031280
Reexamination Certificate
active
10873320
ABSTRACT:
Water-soluble, photosensitive, optically variable (POV) inks exhibit improved OCR readability due to improved infrared absorption properties. The inks can produce images that can be viewed with both visible and ultraviolet light to have physically coincident positive and negative images. The new inks contain at least two types of colorants in addition to the IR absorber and other suitable ingredients. The first colorant comprises a fluorescent dye or pigment emitting light within a characteristic emission band when excited by fluorescent-exciting radiation. The second colorant comprises a carbon black infrared radiation absorbing composition alone or with one or more dyes or pigments having a light absorption band at longer wavelengths than the characteristic emission band of the first colorant or also overlapping the emission wavelength of the first colorant in such a way as to result in a dark color. The inks are formulated to provide higher contrast in the presence of IR radiation while retaining a strong negative correlation between the visible and fluorescent images.
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Auslander Judith D.
Chen Mike Y. R.
Chaclas Angelo N.
Faison-Gee Veronica
Lorengo J. A.
Malandra, Jr. Charles R.
Pitney Bowes Inc.
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