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:
Dec. 05, 2006
Filed:
Apr. 04, 2005
Hiroshi Akai, Aki-gun, JP;
Koso Aoki, Hiroshima, JP;
Hiromitsu Misawa, Hiroshima, JP;
Naoki Uchida, Otake, JP;
Ryo Iwai, Kure, JP;
Hiroshi Akai, Aki-gun, JP;
Koso Aoki, Hiroshima, JP;
Hiromitsu Misawa, Hiroshima, JP;
Naoki Uchida, Otake, JP;
Ryo Iwai, Kure, JP;
Toda Kogyo Corporation, Hiroshima-ken, JP;
Abstract
There are provided magnetic iron oxide particles having an average particle diameter (Dp) of primary particles of 0.05 to 0.3 μm, an average particle diameter (Da) of secondary particles of 0.055 to 0.9 μm, and a ratio of the average particle diameter (Da) of the secondary particles to the average particle diameter (Dp) of the secondary particles (Da/Dp) of 1.1 to 3.0, as well as a magnetic toner containing the magnetic iron oxide particles. The magnetic iron oxide particles of the present invention are in the form of small agglomerated particles and exhibit an excellent dispersibility, and the magnetic toner using the magnetic iron oxide particles is excellent in electrification stability.