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:
Oct. 09, 2012
Filed:
Dec. 19, 2007
Hisashi Wakasugi, Saitama, JP;
Fujio Takasaki, Saitama, JP;
Kazuhiro Handa, Saitama, JP;
Masahiro Miyauchi, Tokyo, JP;
Haruhiko Ikeda, Tokyo, JP;
Hisashi Wakasugi, Saitama, JP;
Fujio Takasaki, Saitama, JP;
Kazuhiro Handa, Saitama, JP;
Masahiro Miyauchi, Tokyo, JP;
Haruhiko Ikeda, Tokyo, JP;
Mitsubishi Paper Mills Limited, Tokyo, JP;
Tokyo Printing Ink Mfg. Co., Ltd., Tokyo, JP;
Abstract
Disclosed are a scratch color-developable ink comprising an electron-donating colorless or light-color dye precursor, an electron-accepting color developer and a varnish, wherein a solid particle component contained therein has an average particle diameter of 0.3 to 25 μm, a scratch color-developable ink comprising an electron-donating colorless or light-color dye precursor, an electron-accepting color developer and a varnish, wherein an azaphthalide compound is contained as the electron-donating colorless or light-color dye precursor, and an invisible information printed sheet obtained by printing invisible information on a support with the above scratch color-developable ink. The above scratch color-developable ink makes invisible information visible easily by scratching with a finger nail although the color of an invisible information printed portion is hard to develop by frictional contact during usual handling, gives a high developed color intensity and is free from the occurrence of dust during the visualization of invisible information.