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:
Sep. 21, 2010
Filed:
Aug. 10, 2007
Minoru Hakiri, Numazu, JP;
Keishi Taniguchi, Susono, JP;
Yuji Natori, Numazu, JP;
Yasuyuki Hosogi, Numazu, JP;
Shigeo Hatada, Numazu, JP;
Shin Hasegawa, Numazu, JP;
Minoru Hakiri, Numazu, JP;
Keishi Taniguchi, Susono, JP;
Yuji Natori, Numazu, JP;
Yasuyuki Hosogi, Numazu, JP;
Shigeo Hatada, Numazu, JP;
Shin Hasegawa, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The present invention provides a pigment dispersion that contains a carbon black, a dispersing agent and water, wherein the carbon black is any one of a channel black and a gas black, the dispersing agent is a sodium naphthalenesulfonate formalin condensate, and the total content of a dimer, a trimer and a tetramer of naphthalenesulfonate in the sodium naphthalenesulfonate formalin condensate is 20% by weight to 80% by weight. The present invention also provides an inkjet ink using the pigment dispersion.