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:
Jun. 03, 2014
Filed:
Jun. 24, 2011
Akira Kawaguchi, Tokyo, JP;
Takahiko Matsui, Tokyo, JP;
Takashi Yoshimoto, Tokyo, JP;
Kenji Ooshima, Tokyo, JP;
Akira Kawaguchi, Tokyo, JP;
Takahiko Matsui, Tokyo, JP;
Takashi Yoshimoto, Tokyo, JP;
Kenji Ooshima, Tokyo, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Abstract
An aqueous black ink composition which enables the formation of an excellent black recorded image having extremely high ozone gas resistance and a neutral and achromatic color. The ink composition comprises: a dye which includes at least one compound represented by specific formula (1) or at least one tautomer or salt of the compound; a dye which includes at least one compound represented by specific formula (3) or at least one tautomer or salt of the compound; and a dye which includes at least one compound represented by specific formula (4) or at least one tautomer or salt of the compound.