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:
Mar. 01, 1994
Filed:
Oct. 28, 1992
Koji Harakawa, Shizuoka, JP;
Takayuki Sano, Shizuoka, JP;
Makoto Miura, Shizuoka, JP;
Akira Fujiwara, Shizuoka, JP;
Tomoegawa Paper Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention to provide novel developing compositions for use in electrphotography which do not cause an adherence of ferrite carriers to the surface of a photoconductor while maintaining high definition and high picture quality of the picture image by using fine size ferrite carriers. The aforementioned developing compositions for use in elecrophotography comprise toners which contain a binding resin and colorant as main components, and ferrite carriers comprised of 5 to 40 mol % of ZnO and 60 to 95 mol % of Fe.sub.2 O.sub.3, and possess a saturated magnetization value of 70 to 100 emu/g in an applied magnetic field of 3000 oersted.