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. 22, 2008
Filed:
Dec. 22, 2005
Takashi Imai, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Shinichi Hakamada, Kawasaki, JP;
Sadayuki Sugama, Tsukuba, JP;
Hideki Takayama, Fujisawa, JP;
Takashi Imai, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Shinichi Hakamada, Kawasaki, JP;
Sadayuki Sugama, Tsukuba, JP;
Hideki Takayama, Fujisawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention aims to provide an ink which has a sufficiently large area factor even in a small ink droplet quantity and can obtain images having a high image density, and further has a superior storage stability. According to the present invention, a cyan ink is provided which is used in an ink set having four kinds of aqueous inks consisting of a cyan ink, a magenta ink, a yellow ink and a black ink in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material, wherein, the ratio B/Ais from 0.5 or more to 3.0 or less, where Adenotes the total content (mass %) of the good medium based on the total mass of the cyan ink and Bdenotes the total content (mass %) of the poor medium based on the total mass of the cyan ink, and a water-soluble organic solvent which shows the maximum Ka value among the respective Ka values of the plurality of water-soluble organic solvents as determined by the Bristow method is the poor medium.