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. 17, 2015
Filed:
Feb. 27, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Masashi Yamamoto, Yokohama, JP;
Eiichi Nakata, Kawasaki, JP;
Shuichi Okazaki, Fujisawa, JP;
Satoshi Takebayashi, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ink containing water, a water-soluble organic solvent and an organic pigment, wherein a primary particle of the organic pigment has a ratio (minor axis b)/(major axis a) of 0.70 or more and a particle diameter of 35 nm or less, the ink contains a water-soluble organic solvent with a dielectric constant of 25.0 or less in an amount of 0.5% by mass or more based on the total mass of the ink, and a dielectric constant ∈of the ink as calculated according to the following equation (1) is 66-72:∈=Σ∈/Σ  Equation (1):wherein n means a kind of water or the water-soluble organic solvent, ∈is a dielectric constant of water or the water-soluble organic solvent represented by n, and ris a content of water or the water-soluble organic solvent represented by n based on the total mass of the ink.