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:
Nov. 15, 2005
Filed:
Apr. 23, 2004
Ayako Uji, Tokyo, JP;
Noribumi Koitabashi, Kanagawa, JP;
Yoshihisa Yamashita, Kanagawa, JP;
Ryota Kato, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Yasunori Fujimoto, Tokyo, JP;
Ayako Uji, Tokyo, JP;
Noribumi Koitabashi, Kanagawa, JP;
Yoshihisa Yamashita, Kanagawa, JP;
Ryota Kato, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Yasunori Fujimoto, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ink for use in ink jet recording which contains a dye and a pigment as colorants. The pigment is a self-dispersible pigment in which at least one anionic group is bonded directly or through another atomic group to a surface of the pigment, the dye is an anionic dye, 2-pyrrolidone is further contained in the ink as a solvent, and the mass-based content X of 2-pyrrolidone in the ink and the ratio Y of the pigment to the sum of the dye and the pigment satisfy the following formulas 1 to 3 at the same time:12≦X<30  formula 150≦Y≦75  formula 2≧−2+84  formula 3.