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:
Oct. 13, 1992
Filed:
Feb. 27, 1991
Applicant:
Inventors:
Masami Gokita, Tokyo, JP;
Goro Oda, Kanagawa, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355204 ; 355203 ; 355208 ; 355209 ; 355210 ; 355246 ; 355308 ;
Abstract
The end of the operational life of a changeable process cartridge, including a developing device, is determined based on either the average particle size of the toner of a two component developing agent stored in the developing device or the number of printed image forming mediums. The average particle size of the toner of the two component developing agent is estimated from the detection voltage of a toner sensor, which detects the toner density of the two component developing agent stored in the developing device.