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:
Feb. 17, 2015
Filed:
Apr. 10, 2013
Keita Katoh, Shizuoka, JP;
Masaki Kudo, Shizuoka, JP;
Tomohiro Nakagawa, Kanagawa, JP;
Akihiko Gotoh, Kanagawa, JP;
Keita Katoh, Shizuoka, JP;
Masaki Kudo, Shizuoka, JP;
Tomohiro Nakagawa, Kanagawa, JP;
Akihiko Gotoh, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An ink set, used in an inkjet recording apparatus equipped with a recording head including: a plurality of nozzle arrays, each including a plurality of nozzles; and a sucking-and-covering unit for covering the recording head, wherein the black ink is supplied to one of the plurality of the nozzle arrays of the recording head, and the color ink is supplied to the other plurality of the nozzle arrays of the recording head, wherein the black ink includes resin-coated carbon-black particles, surfactant-treated carbon-black particles and water, wherein the color ink includes resin-coated color-pigment particles, surfactant-treated color-pigment particles and water, and wherein the ink set satisfies Expression (1), Expression (2) and Expression (3) below:5.0% by mass≦()≦12.0% by mass  Expression (1)3.0% by mass≦()≦10.0% by mass  Expression (2)[()/()]<[()/()]  Expression (3).