The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2003
Filed:
Nov. 01, 2001
Tohru Sugiyama, Tokyo, JP;
Yoshiaki Kudo, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
The indication of correct color evaluation standards of a printed matter including a paper containing a fluorescent whitening agent, is enabled even in the case where the printed matter is observed under a light source that differs from the light source used for color measurement. A spectral reflectance Pt(&lgr;) of the paper under a light source T and a spectral reflectance Pu(&lgr;) of the paper under a light source U are measured in advance and a differential component, due to the fluorescent whitening agent, is determined as Fp(&lgr;)=Pu(&lgr;)−Pt(&lgr;). For a printed matter of dot percent S, a spectral reflectance Rt(&lgr;, S) under light source T is measured, and the measured values are subject to a correction process of adding an effective component within the differential component Fp(&lgr;) that is in accordance to dot percent S to determine an estimated spectral reflectance Rtu(&lgr;, S) under light source U. Estimation in likewise manner can also be performed for XYZ tristimulus values.