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:
Jan. 15, 1991
Filed:
May. 22, 1990
Kiichiro Sakashita, Inagi, JP;
Hirohide Tanikawa, Yokohama, JP;
Satoshi Yoshida, Kawasaki, JP;
Toshiaki Nakahara, Tokyo, JP;
Naoki Matsushige, Kawasaki, JP;
Masatsugu Fujiwara, Yokohama, JP;
Yasuo Mitsuhashi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developer for developing electrostatic images, comprising a non-magnetic toner, the toner containing 17-60% by number of non-magnetic toner particles of 5 microns or smaller, containing 1-30% by number of non-magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of nonmagnetic toner particles of 16 microns or larger; wherein the non-magnetic toner has a volume-average particle size of 4-10 microns, and the non-magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following formula: