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:
Jul. 18, 2023
Filed:
Nov. 13, 2020
Applicant:
Ricoh Company, Ltd., Tokyo, JP;
Inventors:
Koji Katsuragi, Kanagawa, JP;
Haruki Saitoh, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M 3/14 (2006.01); C09D 11/40 (2014.01); C09D 11/36 (2014.01); B41J 2/175 (2006.01); B41J 29/13 (2006.01); B42D 25/387 (2014.01); C09D 11/50 (2014.01); C09D 11/322 (2014.01); B41M 3/00 (2006.01);
U.S. Cl.
CPC ...
B41M 3/144 (2013.01); B41J 2/175 (2013.01); B41J 2/17509 (2013.01); B41J 2/17513 (2013.01); B41J 2/17553 (2013.01); B41J 29/13 (2013.01); B42D 25/387 (2014.10); C09D 11/322 (2013.01); C09D 11/36 (2013.01); C09D 11/40 (2013.01); C09D 11/50 (2013.01); B41M 3/008 (2013.01); B41M 3/14 (2013.01);
Abstract
A method of printing a stealth white image includes applying a stealth ink containing a red coloring material that emits visible light at exposure to ultraviolet radiation and a green coloring material that emits visible light at exposure to ultraviolet radiation to a substrate which contains a fluorescent brightener to form the stealth white image thereon, wherein the stealth white image demonstrates an a* value of from −2.0 to 2.0 and a b* value of from −10.0 to 0 at exposure to ultraviolet radiation having a wavelength of 370 nm according to CIE 1976 L*a*b* colorimetric system.