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:
May. 27, 2008
Filed:
Apr. 01, 2004
Hidekazu Arase, Hyogo, JP;
Mamoru Soga, Osaka, JP;
Masaichiro Tatekawa, Osaka, JP;
Shigeru Kusakata, Shizuoka, JP;
Tsutomu Matsuda, Tokyo, JP;
Masashi Itoh, Shizuoka, JP;
Hidekazu Arase, Hyogo, JP;
Mamoru Soga, Osaka, JP;
Masaichiro Tatekawa, Osaka, JP;
Shigeru Kusakata, Shizuoka, JP;
Tsutomu Matsuda, Tokyo, JP;
Masashi Itoh, Shizuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The invention provides a method for preparing an ink having constituents of a water-soluble dye having a water-soluble solubilizing group of at least one of a sulfonic group and a carboxyl group, water, a water-soluble substance that is condensation-polymerized in the absence of the water, a water-soluble medium and an additive including at least one of an organic acid salt and an inorganic acid salt. This method includes a first mixing step of mixing at least the dye and the water-soluble substance out of the constituents of the ink excluding the additive; a second mixing step of mixing a mixture obtained in the first mixing step and the additive; and a pH adjusting step, performed before the second mixing step, of preparing a solution including the mixture or a solution including the additive while adjusting the solution to a given pH range by using a pH adjuster.