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:
Nov. 19, 2013
Filed:
Oct. 24, 2006
Mariko Kojima, Komae, JP;
Akihiko Gotoh, Atsugi, JP;
Michihiko Namba, Yokohama, JP;
Kiyofumi Nagai, Machida, JP;
Naoya Morohoshi, Numazu, JP;
Tohru Ohshima, Atsugi, JP;
Mariko Kojima, Komae, JP;
Akihiko Gotoh, Atsugi, JP;
Michihiko Namba, Yokohama, JP;
Kiyofumi Nagai, Machida, JP;
Naoya Morohoshi, Numazu, JP;
Tohru Ohshima, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The present invention provides a recording ink set containing a black ink, a cyan ink, a magenta ink, and a yellow ink, each of which contains water, a water-insoluble color material, a water-soluble organic solvent, and a surfactant, wherein the black ink and at least one of the inks other than the black ink respectively contain a different water-soluble organic solvent; and the surface tension of the water-soluble organic solvent(s) used only for the inks other than the black ink is higher than that of the water-soluble organic solvent used only for the black ink; and the present invention also provides a recording method using the recording ink set.