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:
Feb. 13, 1990
Filed:
Oct. 21, 1987
Applicant:
Inventors:
Assignee:
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355246 ; 118689 ;
Abstract
A developing apparatus which includes a toner replenishing device for replenishing toner into the developing apparatus, a toner concentration detecting sensor for generating an output coresponding to the toner amount in a developing material stirred and transported through the developing apparatus, with the output containing a varying output periodically produced and stable output, a discriminating element for deriving the stable output of the outputs from the toner concentration detecting element, and a comparator for outputting a feeding signal to the toner replenishing device through comparison between the output from the discriminating element and a preliminarily set reference value.