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:
Jul. 08, 2003
Filed:
Jun. 05, 2001
Masahiro Yanagisawa, Kanagawa-ken, JP;
Minoru Umeda, Shizuoka-ken, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
An image display medium including a pair of electroconductive layers, at least one of which is light-transmissive and which are opposed each other to form a cell; and a dispersion contained in the cell, wherein the dispersion includes a colored particulate material having at least one of an acidic group and a basic group; a hydrocarbon solvent; a resin soluble in the hydrocarbon solvent and having at least one of a basic group and an acidic group; and a compound having a nonionic polar group, and wherein when the particulate material has an acidic group, the resin has a basic group, and when the particulate material has a basic group, the resin has an acidic group.