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. 28, 1989
Filed:
Nov. 27, 1987
Masanori Nagayama, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
One or each of a plurality of developing units of a magnetic brush type developing device includes a shield plate which is angularly movable in a space between a cylindrical sleeve, which constitutes a developing roller, and a magnetic body so as to shield a part of magnetic fields which are developed by the magnetic body. The shield plate moves in a reciprocal motion only between a first position corresponding to that where the sleeve scoops a developer and a second position where the developer is separated and not to a position where a main pole magnet for development of the magnetic body is disposed, so that a magnetic field developed by the main pole magnet is not shielded. A member for supporting the shield plate is interposed between the magnetic body and the shield plate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile