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:
Aug. 26, 2014
Filed:
Dec. 06, 2012
Minoru Hakiri, Shizuoka, JP;
Mitsuru Naruse, Shizuoka, JP;
Masayasu Nonogaki, Shizuoka, JP;
Naoya Morohoshi, Shizuoka, JP;
Minoru Hakiri, Shizuoka, JP;
Mitsuru Naruse, Shizuoka, JP;
Masayasu Nonogaki, Shizuoka, JP;
Naoya Morohoshi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An inkjet recording ink including: water; a first pigment dispersion; a second pigment dispersion; and a penetrating agent, wherein the first pigment dispersion includes oxidized carbon black CB-1 dispersed therein with a pH of the first pigment dispersion adjusted to 6 to 8 with an alkali metal hydroxide, where the oxidized carbon black CB-1 is oxidized with ozone and has a volatile content of 10% to 20% and a BET specific surface area of 90 m/g to 150 m/g, and the second pigment dispersion includes carbon black CB-2 dispersed therein with a naphthalene sulfonic acid-formalin condensate, where the carbon black CB-2 has an average particle diameter (D50) of 50 nm to 180 nm as measured by a dynamic light scattering method and a standard deviation of particle diameters of the carbon black CB-2 is equal to or lower than ½ of the average particle diameter.