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:
Apr. 23, 1991
Filed:
Aug. 04, 1988
Applicant:
Inventors:
Masato Asanuma, Nara, JP;
Masatoshi Kaneshige, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
118658 ; 355251 ; 355253 ;
Abstract
A developing device for an electrophotographic copier includes a shutter along its toner supply route and a toner concentration detector sensor connected to a timing circuit. If the toner concentration is detected low, the timing circuit causes the toner supply to continue even after development is completed and the shutter is closed. An auxiliary stirrer is provided to keep stirring freshly supplied toner even after development is completed and the shutter is closed.