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. 04, 2007
Filed:
May. 06, 2005
Atsushi Miyazaki, Fujimi-machi, JP;
Makoto Matsumoto, Himeji, JP;
Mitsuo Kushino, Hyogo, JP;
Teruo Kikuta, Nagaokakyo, JP;
Akio Ito, Suita, JP;
Atsushi Miyazaki, Fujimi-machi, JP;
Makoto Matsumoto, Himeji, JP;
Mitsuo Kushino, Hyogo, JP;
Teruo Kikuta, Nagaokakyo, JP;
Akio Ito, Suita, JP;
Seiko Epson Corporation, Tokyo, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
An object of the present invention is to provide a microcapsule for an electrophoretic display device which can suppress reduction in later contrast even when the electrophoretic display device is allowed to stand under the high temperature and high humidity condition, favorably, under the high temperature and high humidity condition for a long time (e.g. under 60° C., 90% RH for 24 hours). As a means of achieving this object, a microcapsule according to the present invention for an electrophoretic display device comprises an electrophoretic fine particle and a solvent both of which are encapsulated in a shell, and is characterized in that an amount of an alkaline metal ion in the whole microcapsule is 150 ppm or smaller.