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. 02, 2007
Filed:
Dec. 22, 2005
Yui Tokuda, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yoshihisa Takizawa, Tokyo, JP;
Masashi Ogasawara, Tokyo, JP;
Tomonari Watanabe, Kawasaki, JP;
Takashi Imai, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Shinichi Hakamada, Kawasaki, JP;
Sadayuki Sugama, Tsukuba, JP;
Yui Tokuda, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yoshihisa Takizawa, Tokyo, JP;
Masashi Ogasawara, Tokyo, JP;
Tomonari Watanabe, Kawasaki, JP;
Takashi Imai, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Shinichi Hakamada, Kawasaki, JP;
Sadayuki Sugama, Tsukuba, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is an aqueous ink comprising at least water, a plurality of water-soluble organic solvents and a coloring material. The coloring material is a pigment, and, it contains a pigment particle having at least one ionic group bonded to a surface of the pigment particle directly or via another atomic group. The plurality of water-soluble organic solvents have a good medium or good mediums for the pigment and a poor medium or poor mediums for the pigment. The poor medium does not solvate perfectly or substantially the pigment. The ionic group undergoes perfectly or substantially no ionic dissociation in the poor medium. Also, among the respective Ka values of the plurality of water-soluble organic solvents as determined by the Bristow method, the Ka value of the poor medium is maximum.