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:
Oct. 14, 2008
Filed:
May. 16, 2005
Masahiko Matsuura, Suita, JP;
Hiroshi Mizuno, Ikoma, JP;
Akihito Ikegawa, Sakai, JP;
Masaharu Kanazawa, Suita, JP;
Keyaki Yogome, Kyoto, JP;
Takaji Kurita, Osakasayama, JP;
Masahiko Matsuura, Suita, JP;
Hiroshi Mizuno, Ikoma, JP;
Akihito Ikegawa, Sakai, JP;
Masaharu Kanazawa, Suita, JP;
Keyaki Yogome, Kyoto, JP;
Takaji Kurita, Osakasayama, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
Disclosed is a reversible image display medium which can be repeatedly used and can display high quality images, in which cells between the two substrates accommodate a dry developer containing at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; images are displayed by forming an electrostatic latent image corresponding to the image to be formed on one of the two substrates to drive the developing particles in an electrostatic field based on the electrostatic latent image; a developer-facing surface of one of the substrates has a surface resistivity of at least 1×10ohm/square; a developer-facing surface of the opposite substrate has a surface resistivity from 1×10ohm/square to 1×10ohm/square; a developer-facing surface of one of the substrates has a surface average median roughness Ra of 0.2 μm to 0.5 μm; and an external surface of the substrate on image observation side has a surface average median roughness Ra of 0.2 μm to 0.7 μm.