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. 15, 1983
Filed:
Oct. 01, 1981
Susumu Tanaka, Toyokawa, JP;
Tateki Oka, Toyokawa, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An electrographic copying machine of the powder image transfer type in which a channel for transporting the developer recovered by a cleaner to a developing unit includes an assembly for removing foreign matter from the developer. The developing unit is adapted to develop latent electrostatic images with a magnetic developer which is a mixture of finely divided insulating toner and a magnetic carrier having small size particles and a resistivity of at least 10.sup.13 ohm-cm. The assembly has a nonmagnetic hollow cylindrical member for guiding the developer, a magnetic transport member disposed within the cylindrical member for transporting the developer, a foreign matter removal opening formed in the lower wall of the cylindrical member, and magnets for forming a magnetic field for attracting the magnetic carrier contained in the portion of the developer positioned in the vicinity of the opening upwardly in the cylindrical member.