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:
Mar. 20, 2007
Filed:
Oct. 21, 2004
Mayuko Umemura, Chiryu, JP;
Masashi Tsuda, Aichi-ken, JP;
Hideto Yamazaki, Nagoya, JP;
Hiromitsu Sago, Tokai, JP;
Michiko Aoyama, Nagoya, JP;
Shunichi Higashiyama, Yotsukaichi, JP;
Mayuko Umemura, Chiryu, JP;
Masashi Tsuda, Aichi-ken, JP;
Hideto Yamazaki, Nagoya, JP;
Hiromitsu Sago, Tokai, JP;
Michiko Aoyama, Nagoya, JP;
Shunichi Higashiyama, Yotsukaichi, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
A fluorescent water base ink for ink-jet recording contains a fluorescent dye having a xanthene skeleton, and a glycol. In the fluorescent dye, the difference in hydrophilic index log P is not less than 2.6 between a substituent bonded to C-9 carbon atom of the xanthene skeleton and other portion of the fluorescent dye than the substituent bonded to the C-9 carbon atom. The glycol has a distance between hydroxyl groups substantially equivalent to or longer than an interatomic distance between atoms directly bonded to C-3 and C-6 carbon atoms of the xanthene skeleton of the fluorescent dye, respectively. It is assumed that the glycol is coordinated with the xanthene skeleton in a bridge form to increase the fluorescence intensity by increasing the electron density of the xanthene skeleton. The ink having high fluorescence intensity and in which the fluorescence intensity is not lowered in a time-dependent manner is provided.