Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2011-06-07
2011-06-07
Lorengo, Jerry (Department: 1731)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031650
Reexamination Certificate
active
07955426
ABSTRACT:
The present invention provides an ink set comprising at least two or more pigment inks different in color, wherein differences in average particle size between the inks different in color are 30 nm or less, the inks each have a sedimentation rate, as indicated by equation (I), of 15% or less, and differences in the sedimentation rate between the inks different in color are 4% or less:in-line-formulae description="In-line Formulae" end="lead"?Sedimentation rate (%)=(S0−S1)/S0×100 (I)in-line-formulae description="In-line Formulae" end="tail"?wherein S0represents an “initial ink concentration”, which is an absorbance at a wavelength of λmax (or at 500 nm when λmax is not detected) at the time when UV spectral characteristics are measured for a 1000-fold diluted solution of the ink; and S1represents an “ink concentration after sedimentation”, which is an absorbance at a wavelength of λmax (or at 500 nm when λmax is not detected) at the time when UV spectral characteristics are measured for a 1000-fold diluted solution of a supernatant obtained by centrifuging the ink at 16500 G at 1.60×107g·sec.
REFERENCES:
patent: 6399674 (2002-06-01), Kashiwazaki et al.
patent: 2001/0025586 (2001-10-01), Watanabe
patent: 2003/0195274 (2003-10-01), Nakamura et al.
patent: 2005/0284329 (2005-12-01), Jackson et al.
patent: 2006/0075925 (2006-04-01), Stoffel et al.
patent: 2000-355667 (2000-12-01), None
patent: 2001-328282 (2001-11-01), None
Computer-Generated English Translation of Specification and Claims and Patent Abstracts of Japan of JP 2001-328282 dated Nov. 27, 2001.
Computer-Generated English Translation of Specification and Claims and Patent Abstracts of Japan of JP 2000-355667 dated Dec. 26, 2000.
Faison Gee Veronica
Ladas & Parry LLP
Lorengo Jerry
Seiko Epson Corporation
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