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:
Jun. 12, 2012
Filed:
Jun. 17, 2004
Yasuo Yamamoto, Minamiashigara, JP;
Satoshi Hiraoka, Minamiashigara, JP;
Hidehiko Soyama, Minamiashigara, JP;
Takeshi Matsunaga, Ashigarakami-gun, JP;
Yasuo Yamamoto, Minamiashigara, JP;
Satoshi Hiraoka, Minamiashigara, JP;
Hidehiko Soyama, Minamiashigara, JP;
Takeshi Matsunaga, Ashigarakami-gun, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an image display medium comprising a pair of substrates facing each other; and a particle group comprising two or more types of particles sealed in a space between the substrates, at least one of the two or more types of particles being positively chargeable by an external stimulus and at least one other of the two or more types of particles being negatively chargeable by an external stimulus, and the positively chargeable and negatively chargeable particles having, respectively, colors different from each other, wherein the positively chargeable and negatively chargeable particles have particle size distributions satisfying 0.4<Ds/Dl<0.9. Ds represents the particle size distribution of at least one type of particles charged with one polarity and Dl represents that of at least one other type of particles charged with the other polarity.