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:
Apr. 19, 2011
Filed:
Jul. 17, 2008
Akira Kuriyama, Atsugi, JP;
Takayuki Teshima, Yokohama, JP;
Kazumichi Nakahama, Tokyo, JP;
Rie Ueno, Hadano, JP;
Masatoshi Watanabe, Isehara, JP;
Takeo Suga, Kawasaki, JP;
Akira Kuriyama, Atsugi, JP;
Takayuki Teshima, Yokohama, JP;
Kazumichi Nakahama, Tokyo, JP;
Rie Ueno, Hadano, JP;
Masatoshi Watanabe, Isehara, JP;
Takeo Suga, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A pigment ink composition has high transparency and good color characteristics such as a high OD that are not inferior to those of dyes, even though pigment particles are used, and also has good weatherability and remaining ability on the coating and printing medium surface that are inherent to pigment particles. The pigment ink composition contains pigment particles including at least needle pigment particles, a dispersant, and a solvent. The needle pigment particles have a needle shape with an aspect ratio of at least 3, an average aspect ratio of at least 5 and at most 7, an average short dimension of at least 20 nm and at most 30 nm, and a distribution of short dimension with a standard deviation of 2.0 nm or less. The needle pigment particles are covered with the dispersant.