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. 02, 1997
Filed:
Dec. 12, 1996
Masahiro Takagi, Minami Ashigara, JP;
Akihiro Iizuka, Minami Ashigara, JP;
Satoru Ishigaki, Minami Ashigara, JP;
Masanori Ichimura, Minami Ashigara, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An electrostatic-image developer which comprises a toner and a carrier comprising core particles coated with a coating resin, wherein the toner comprises toner particles having a volume-average particle diameter of from 3 to 9 .mu.m and having a specific particle diameter distribution, at least 20% of the total surface area of the toner particles is covered with (a) an external additive having an average particle diameter of from 20 nm to 100 nm, and at least 40% of the total surface area of the toner particles is covered with (b) an external additive having an average particle diameter of from 7 nm to 20 nm, and wherein the core particles of the carrier are magnetic particles formed from a composition comprising 100 parts by weight of a ferrite component represented by the following formula (3):